July '08
105. Power Conversion
106. Fiddly Bit
107. Closing the Rudder Compartment
105. Power Conversion


The DC to DC converter I have settled on to keep the house battery topped up from the drive system is the Sevcon 622/11084, which accepts a range of input voltages from 36 to 48, and, crucially, provides an output of 13.5 volts, not 12 volts. 12 volt outputs cannot act to charge up a 12 volt battery efficiently. The operating current is up to 25 amps, which is probably more than I need, but the cost of this 300 watt model is the same as the smaller 180 watt one, which only provides 15 amps, so I went with this big one. With this output it would be possible to operate the domestic system without a house battery at all, as the maximum draw with every conceivable device operating simultaneously is only 30 amps, and that is a generous estimate. However, the ability to operate the house system from a reserve battery while the drive system is turned off is important to me, so I will use a 12 volt house battery anyway.


The Sevcon DC to DC converter.

There are cheaper converters on the market than the Sevcon, but they are not necessarily designed for marine use. I am happy to pay the extra for some peace of mind. In general, DC converters can be found either isolated or non-isolated. The non-isolated ones should not be used with boats which do not use isolated electrical systems, ie. which use the hull or the engine block as a return for the electrics. But this is bad practice anyway, so the consideration is irrelevant. Besides, the Sevcon is isolated.

The unit comes with is own mounting plate which acts as a heat sink, and as these converters can get quite hot their placement is important. I will be putting mine into the motor compartment where it should not be a problem.
Both input and output side need to be fused. The input fuse is located in the converter. AWG 10-12 gauge cable is recommended, but using 8 gauge, which is more readily available here, would give a greater capacity, and allow for the use of a fuse which would be comfortably higher than the 25 amps which might be carried. The positive input lead can come off the battery switch output terminal, or from the main circuit breaker, and, despite the fact that the unit has an input side fuse, I will add an in-line fuse rated at about 30 amps to protect its wiring.

The connector is a Molex 4 pin type, but unless you are experienced with these connectors you will not find their assembly altogether intuitive, particularly the fitting of a piece labelled TPA, which is terminal position assurance. Instructions on a PDF document can be found here. It can be seen that the Molex terminals are advertised as being suitable for AWG 8 to 16 wires, but the 8 will be a very tight fit by the look of it. This will certainly be a case for soldering the terminals to the wires.

The negative input side can connect to the main negative bus bar, or, more conveniently, to the negative post on the motor controller. (This region of the circuitry will also have to accommodate cabling for the motor controller, the contactor and the recharger, so physical requirements will dictate the best placement). As can be seen from the photo above, the unit does not take up much space.

The positive input I eventually decided will be from the switched positive terminal on the controller.

The output positive will join the domestic circuit downstream of the house system's ammeter, so that, the way I have the ammeter wired, when it is recharging a low domestic battery the ammeter will reflect that in a positive deflection. When the house battery is fully charged, however, and whenever the drive batteries are not operating, the ammeter will be in negative deflection for a draw on the domestic circuit. Current flowing from the converter to the house systems will not pass through the house ammeter, so, with the drive system operating, there should be no deflection on the ammeter provided the house battery is not discharged. I expect that the most common situation will show zero draw when the boat is in motion, and a slight negative draw when its motor is shut down. However, use of the house systems via the converter will result in a greater deflection in the main ammeter, albeit very slight.

The negative lead on the output side will join the main domestic negative bus bar.

I have bolted the unit to a piece of ply which will be screwed onto the dash bulkhead from the motor side when a suitable place is found for it. Although it is not large, the available space is now going to be dictated by the batteries which will sit just forward of the bulkhead at its lowest level, and by the remaining pieces of equipment, namely the controller and the contactor, which have yet to be acquired.

The shortest possible cable run would see the converter sitting somewhere between the main circuit breaker and the main negative bus, but as that latter has not yet been allocated a place I will leave the converter as a loose item for the time being.

Incidentally, while I am turning my mind back to the electrical system, I have solved a problem with the on/off switch. Back in April I was contemplating whether to have a second keyed switch for the main drive batteries, or to use either the battery selector switch or the main circuit breaker instead. The problem was that it had to be able to handle 24 volts, and the ones which do that are invariable big ugly brutes of things which would look out of place in the cockpit. But now, having plumbed the push rod from the throttle control lever to the pot box through the space behind the lagging, I have had to build a forward wall for the driver's glovebox, such that any of its contents can not interfere with the throttle. The wall is easily reached by the driver's hand, but is not visible from the cockpit.

In other words, it is the perfect place to locate this contraption: a battery security switch, or "kill switch" with its removable key. It can be hidden in the glovebox out of sight, and not only will it allow access only by key actuation, but also its hidden location would frustrate any would be thieves, for a short time anyway. The wiring necessary for it would mean a run of an extra 250 mm. each way, which is not significant. The connection will now go from the vicinity of the main circuit breaker to this switch and on to the controller's activator for the contactor coil. (Remember that the controller turns on its own contactor!).

It would then be possible to wire up the contactor via this switch as well, (effectively putting contactor and controller in parallel), although it can just as easily be directly wired to the circuit breaker, making the controller, contactor coil and contactor a series. In the former case, the switch would need to be able to handle 48 volts and 100 amps, as all the main battery current would reach the controller via the switch and the contactor. In the latter case, only the small activating current needed for the controller to start up would pass through the switch, requiring only 24 volts and a much lower amp rating. The switch can handle either situation. The smaller diameter wiring required for the 24 volt arrangement is what tips the balance in its favour, but in order to take advantage of that you will have to arrange some appropriate connections.

(The preceding paragraphs have to be somewhat amended in the light of subsequent developments. See March '09 for details).


The back of these units has a pair of 3/8" terminals, which is more than is required for my wiring purposes, but some suitable lugs for AWG 12 gauge wires and 10 mm. holes will do the trick. That will give a very comfortable current tolerance. The cut out is a bit awkward, as it needs a channel rather than a circle, and the channel has to be semi-squared at the ends, so it won't be a fit straight from the router, but it is all achievable in 15 minutes of hand work.

Once the unit is mounted the wires are routed away from the throttle push rod, and through a grommeted hole in the dash bulkhead. One of them is taken directly to the outlet terminal on the shunt for the main ammeter, which is a point it will have to share with the contactor, and possibly the DC converter later on. At the moment there is enough room there, but if it gets too crowded the converter can be connected further downstream at the controller itself.

   
The back of the kill switch (left) and the wires to and from it passing through the dash bulkhead (right).


They enter the motor compartment above the throttle and pass under it.


The fat red cable leads from the main circuit breaker on the right to
the ammeter shunt on its left. The small wires head up from there to
the ammeter (not seen), and the mid-sized red one goes to the kill switch.

One of the reasons for having separate on off switches for the drive and domestic systems is so that the drive system could be shut down while the cockpit facilities remain functional. That was particularly relevant to the situation where an accidental nudge on the throttle lever would throw the boat into motion if the drive system were still active (say, while having lunch on board with the music playing). Normally the line contactor remains closed at all times after start-up, unless there is an interruption to the power supply. However, the controller can be calibrated to shut off the contactor if there is no drive activity after 5 seconds. It would then have to start up again with the resumption of drive activity. That is an added safety feature which may be thought to help prevent unexpected boat motion, but in fact it would just delay such an event by the short time it takes the controller to activate the contactor. Exactly how long that time is I am not certain of, but if it is too short it is useless, and if it is too long it is a nuisance during boat manoeuvring, when there may be 5 second delays in drive activity while the throttle is in the neutral position. So I am sticking with the two switch model, and am also looking into adding a brake to the throttle lever to discourage unexpected movements.

 
A normal view into the glovebox, even with flash illumination does not reveal the switch,
 which can be seen from a worm's eye view.




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106. Fiddly Bits

Now that the cockpit is lined, the final trim
ming can be done to finish it off and conceal any small gaps. Although the lagging was cut to fit without any appreciable gaps at all, the addition of four layers of finish to the boards has meant that the fit was no longer exact, and some of them had to be reduced slightly to allow them all to be replaced into their positions.



The major pieces of trim consist of kickboards along the bottom of the lagging, sitting on the sole, and they have to be mitred to meet one another, although, naturally enough, not at right angles. In addition, there are filleting pieces where the sides and the bulkheads meet, and these are arranged at compound angles which have to be determined by trial and error.



The Andrews launches had very generous footrests for the driver and forward passenger, but I feel that they would further reduce the space available for the rear seat passengers in this short version of the boat, so I am either making them much smaller, or dispensing with them entirely. And because of the opening door on my dash console, I cannot have any footrest passing across it to prevent its movement. I do not need the gear stick, as forward and aft direction is controlled by the throttle lever, and as I intend to use carpet on the sole, rather than the duckboards seen here, I cannot have any footrest creating an impossibly difficult shape for the carpet to fit.


The drink trays seen left are a nice touch, although there is another version of these with a fiddle attached instead of glass recesses, and that is eminently more practical for holding anything other than long stem glasses, if that is important.


The windscreen frame needs some beading along its bottom piece, to meet a similar piece on the coamings.


Finally, despite my great care in cutting the angled ends of the rear seat fiddle, it now leaves a small gap where it abuts the glovebox covers just forward of the rear seat. (This is probably because they did not have their apertures cut when the fiddle was first fitted, so that they were stiffer and more resistant to bending). Rather than run fillets around those gaps, which would look fussy, I think I might just reduce the length of the fiddles by enough to allow two leather buffers to be glued to its ends, which will ride on the glovebox covers and give a cushioning effect.


Thin leather buffers close the gaps between glovebox covers and rear seat fiddle.

In the meantime, I am taking measurements for the rear seat cushions, which will be made from medium density foam, wrapped in wadding. That will leave the upholsterer no excuse for procrastinating, and will hopefully spur her into activity.

On the subject of upholstery and kickboards, the question of carpet needs to be decided too. The marine grade synthetics which are UV resistant seem to be the best bet, although their rough texture is a bit out of keeping with the mood I am trying to create. A plush one rather than the heavy duty ribbed variety seems preferable. But before the kickboards are attached I have to decide whether the carpet will run in under them, or finish up against them, in which case they will sit on the sole. Fitting under would give a neater appearance, and might help prevent slippage to a certain extent, but it would not make for easy removal. If the carpet butts up against the kickboards it would be easier to lift out at the end of a day's boating, but it would look unfinished unless a binding were sewn around its perimeter.



This carpet is a bit ragged.

1. The Kickboards

My final decision was to take the kickboards to the sole and butt the carpet into rebates cut into the boards. That way I get the advantages of both systems. There will have to be a binding, so I will need a trimmer to do the job. I will look into ways to stop the carpet from slipping around.

To find the correct angles of these compound joints is no easy task: they are off right angles in all three planes. It seemed that it would be simpler to run the kickboards up to fillet pieces than to cut mitres for them, but even so, trial pieces have to be cut first to fit, and the angles taken off them later. Here, the first set of trial pieces is cut for the meeting of the starboard side and rear seat front joins.


These pieces have rebates cut into their sole sides to accommodate the carpet. They are meeting at a vertical mahogany fillet.

I have initially chosen 20 mm. as the thickness for these pieces, because that will be the thickness of the coamings, but if they look too chunky their dimensions can be reduced. I think some generous rounding of the sharp edges will give the final boards a more refined look, but if you take a close look at the dimensions of the Freebody slippers, my boards might be seem to be too thick. The boards below look to be about 10 mm. with a beading on the bottom to make them seem more substantial. I don't want to reduce the thickness of mine quite that much, because I want to screw them to the lagging and cover the screw holes with a contrasting inlay. So I need to have enough thickness to allow for a trench to be cut for the inlay, and to have some grip for the screws. 15 mm. might be just about right.


Detail of the moulding and sole in a Peter Freebody built slipper launch.

Off the topic for a moment, I wonder whatever has possessed the owners of this boat to cover their duckboards with what looks like painted cheesecloth. I think it looks awful, and obscures the impressive woodwork involved in making the duckboards in the first place. This is surely too high a price to pay for the slight inconvenience of having to lift the duckboards to retrieve lost objects.


Back to the kickboards: once one end of the board is cut to fit the fillet, its length is trimmed so that it is just a bit too long to fit between both fillets. The fitted fillet is then removed to allow room to manoeuvre, and the other end of the board is cut to fit the other fillet. When both ends are fitting flush, the board is cut to length to fit tightly between the fillets. It is then rebated for the carpet, and a trench is cut to house the proud inlay which will cover the screw holes where the board is attached to the seat front. The fillets are screwed to the seat front and the side lagging, then all are removed for the application of finish, before being replaced permanently.


Kick board is fitted to the starboard fillet.


Then to both fillets.


Fillets are screwed in and the board is rebated for the carpet.


Kickboard is fitted with a proud inlaid bead to cover screw holes.


Now the same has to be done along the sides and along the dash bulkhead outside the console. At first blush it seems as if I will have to remove the already fitted rear seat fillets to give myself room to manoeuvre the long boards for the cockpit side, but not necessarily. The bowing up the side means that they will have to be bent to fit anyway, so I only have to lever the aft end out towards the amidships region, push the centre towards the hull, and there is enough space to slide the board forward and back a little. As soon as there is a snug fit between the forward end of the board and the dash fillet, the board only has to be cut to length with the same saw settings. Finding the correct length is by trial and error cutting, because the bow prevents any accurate measurement of length. And yes, it is tedious work.


A bit of finish on the kickboard.

For the side boards to be attached the lagging has to be fixed permanently to the framework, and ditto for the forward boards, so, at the same time as I have been measuring for them I have been sequentially gluing the lagging into position, one piece at a time, so as to be able to use clamps and avoid the need for visible screws. Coming to the dash, the glue has to be contact adhesive, but because of the tight fit of these strips between the cantilevered deck stringers, the adhesive has to be used wet so as to avoid an instant grip on an imperfectly aligned strip. That has meant that the strips have been able to be manipulated into a perfect alignment, but it also means that the glue has not been able to set without clamping. For the most part the adhesive has been no problem, but there were one or two spots where the bulkhead must have been a little depressed, and there were hollows developing between it and the lagging. These had to be clamped out for long enough for the adhesive to dry and set, which is generally about half an hour. Some makeshift clamping was called for:

The area most in need of clamping was the spot below the steering column, where the bulkhead may have been a little distorted by the attachment of the steering box on its other side. By the use of sprung battens between the cockpit back and the dash, the hollow was able to be pressed out.

At the same time, on the side, as the dash is approached, the natural line of the lagging strips is to spring away from the central stringer which is supposed to support them. So they have been glued to it with assistance from athwartships battens where necessary, as is seen here on the forward strip.


When the glue is dry all screws are removed for the fitting of the kickboards.




The forward one is relatively easy to fit, but the side one is a lot more difficult because of the curvature along its length. It also has a constantly changing angle on its base as the angle between the sole and the side lagging changes. In the end it proves to be too much of a temptation to cut it for the most obtuse angle along its full length, and that works fairly well.
With the full wide angle on my camera to include all of the cockpit finished so far, it seems to be quite foreshortened and boxy. But that is not apparent in the flesh, so to speak. It will look a bit sleeker again when the coaming is attached, as it will reduce the apparent height of the lagging.


The kickboards on the starboard side are attached. There is no beading on the long one yet, but the groove for it is cut.


Unless the beading is a very tight fit in the groove it will spring away from the kickboard as it bowstrings. This is overcome in the usual manner.







After the clamps are removed, and the board is given another coat of Cetol it is beginning to look good.



Mind you, to get to the next slide it has taken two weeks of fiddle, and it is almost the same as the slide at the beginning of this section!



The job is finished with the complete lining of the cockpit sole by kickboards, except for the dash console area.


Some of the deck hardware is collected on the rear seat while the beading strip on the port kickboard is glued in.

 
Finished!




2. The Lighting

The decision to continue the cockpit lagging across the front of the rear seat, rather than have exposed ply, meant that the cabin lights which were mounted on the seat had to be removed. Now that the seat lagging is complete, the lights have been put back. The rear of the cockpit now matches the front again with two lights each.

Cockpit lighting is functional again.


3. A Telephone Charging Jack

The enormous range of GPS devices, fish finders, UHF radios, etc. on the market make it seem neglectful not to have some sort of navigational aid, but as this boat will only be used in closed waters with which I am familiar, I am not going to go over the top with devices. However, a mobile phone is always handy, and if I use mine for its GPS capabilities it chews up the battery power in no time at all. A 12 volt charger for it is a good precaution, and I will run it off the power supply for the fridge. In order to have both functions available simultaneously, I am putting a second outlet, parallel with the fridge socket, into the rear seat glovebox. A simple junction box with jump connectors will split the current into both terminals.








4. Provision for Battery Cabling


In order to retrieve the battery cables from under the sole I have had to cut a hole in the part of the sole which will be under the driver's seat. This now needs tidying up and covering. It is not certain that I will need the extra batteries yet, so I leave the cover screwed down for later removal in case they are.


The sole aperture for extra battery cables.


The second cable I was planning to run under the sole and up into the sub-seat space from the area behind the lagging, but the bends required are too tight for these large gauge cables, so instead I will bring it out through a skin fitting into the cockpit, and then through another one into the sub-seat. The fitting I have chosen is a plastic one with chrome surround, but despite the relative softness of the plastic I am taking some precautions to eliminate the possibility of chafing on the cable insulation.

Firstly, the hard electrical conduit I had laid for the cable is to be replaced by a soft and flexible PVC tubing, designed for bilge pumps. Secondly, the cable's passage through the skin fitting will be protected by a second layer of clear plastic tubing surrounding the insulation. And thirdly, the space between the skin fitting where it exits the lagging and the one where it enters the seat will be further protected by another layer of bilge pump flexible tubing.


The skin fitting with the clear plastic tubing in place.


Then with the red battery cable and finally the bilge pump tubing.


The skin fitting straddles the lagging strip behind the glove box cover, and will be matched by a similar one facing it from the seat base.

The seat base will be fixed onto the sole eventually, so there will be no need to make the cabling detachable. Even although this area behind the lagging will soon be inaccessible, the replacement of the hard conduit by the flexible black one, seen above touching the dash bulkhead, will mean that the cable will be able to be fed from the cockpit to the motor compartment with ease. And, although the final appearance will look a bit like "Lost in Space" it will be inconspicuous beside the seat.




I am actually happier now with this arrangement than with the one passing under the sole, since it will all be either above the waterline, or inside a watertight tube when it is not.


The tubing attaching to the skin fitting behind the lagging.

In order to hurry along the process of permanently fixing the lagging I have resorted to the sprung batten method there too. Up until now, I have only been fixing one piece at a time with the aid of a clamp because I have had other tasks to keep me occupied. Now I have to finish this business to get the last port side kickboards down.


The port side has two electrical outlets, one for each cable, because the under-sole route has been taken by the bilge pump




5. The Sole Covering.

With the carpet retaining rebates now available, I have taken a few samples of marine carpet to see how it will look. It is basically a choice between ribbed or plush ones. The best looking are the highest maintenance, as always seems to be the case. They will certainly not be glued down, as some suggest they should, because I want to be able to inspect the bilge. I imagine that double sided tape will be sufficient, along with the natural stiffness of marine carpet.



The final decision was to employ a charcoal coloured, ribbed carpet, which lasts longer than the plush ones. The colour choice is very limited in marine carpet, but the dark grey looks alright with the existing wood colours. Initially it is laid over the full expanse of the sole, but it will need to be altered once the driver's seating is put in. It is a tight squeeze to get the ribbed carpet under the edge of the rebate, but that is a good thing to help it stay secure. It is not, however, tight enough to be able to do without some fixative, so carpet tape will be employed in due course.


The carpeted sole.





107. Closing the Rudder Compartment

The next major part of the construction will be the attachment of the side coamings. That means that the stern coaming will have to be shaped to the deck camber, which will require that the subdeck immediately behind it will have to be glued down and free of obstructions to a scribing tool.


The rough scribing line on the rear coaming.

That, in turn, means that the rudder compartment will be sealed, apart from the hatch access, so that it is now time to complete all the jobs in there before access becomes a lot tighter. Chief amongst these is the strap which holds the rudder's stern tube back onto the F bulkhead. There is the spacing block there, which is bolted and glued to the bulkhead, and the plan calls for a steel strap to be screwed to the block on both sides, passing in front of the tube. In the original arrangement the block had the same width as the tube. I am adapting that to my own requirements, because my block actually houses the tube, rather than just acting as a spacer, so that any stiff metal strap would be difficult to position securely, touching, as it would, only the front tangent of the tube. Instead, I am using seat belt webbing, which will be attached to the block by two buckles screwed into it. This is another job for the sewing machine of the tardy upholsterer, and until it is completed I cannot do much more with the boat, so there will have to be some deals done, I can see.


Presently held in only by the blue tape, the stern tube for the rudder needs anchoring onto its spacer block.


Some home-sewn webbing does the trick.

Then there is the situation with the rudder itself. Currently, it is just sitting there with the tiller attached but not screwed onto it. The set screws on the tiller need a flat to land on. It seems easier to file a flat with the rudder in situ, rather than jack up the boat to remove the rudder. But in order to do that, and get a true flat I will have to arrange some sort of squared support for the file to stop it rounding the edges of the rebate it will create.


These set screws need a flat on the shaft.

Finally, the hatch itself need attention. At the moment it is a very tight fit and has to be eased. I have to test fit the openings for a rear-hinged arrangement, but I am hopeful that the upward slope of the deck at hatch level will have resulted in a hatch which will clear the opening without bevelling. Then there is the drainage of the hatch drip channels. It seems excessive to have a dedicated through-hull just for the occasional trickle which may come from the drip channels, but what are the alternatives? They could be drained into the bilge for the bilge pump to take care of, but that would mean that water would be running through the rear seat locker. (Now I see why the plan had a sole in that area!). Or the drip channels could be drained via tubing into the bilge forward of the locker, but that would mean loose tubing running through the locker where it could get snagged. In view of the fact that I expect there to be very little in the way of run off from the hatch, a viable alternative is to drain it into a reservoir bottle which could be emptied at the end of the day's boating. That is the final solution I have gone with, and can always be replaced with a through-hull later if it proves to be ineffectual.


The drip channels around the rear hatch.

An old dishwasher which was about to be discarded provided the necessary copper tubing for the drip channel drainage. Two 10 mm. holes were bored into the channels at their most dependent parts, the aft corners, and short segments of tube were epoxied into the holes. On the starboard side, where the tubing came out above the block for the steering support mechanism, the copper segment was bent to allow plastic hose to be attached to it and run to the reservoir without kinking. That was not necessary on the port. The hoses were fixed with hose clamps.


The drainage mechanism for the drip channels.



There will be few occasions (I hope) when there will have to be access made to this compartment, but that is no reason to leave it looking shabby. I have started to prepare it for a coat of grey paint for bulkheads and hull, and I have been so impressed with the performance of the black japan I used in the gloveboxes that I am using it again to stain the stringers, top frames and hatch. The stuff smells so much like creosote that I was sure it would have a beneficial preservative effect on the Oregon, apart from which it will look quite striking to any passing aesthete who is curious enough to stick his head through the hatch. In fact, it turns out that black japan has a bituminous base, so I was not far off the mark. It was also the original black finish on Henry Ford's T-models. Well, I am not going into production with slipper launches, but if Henry recommends it who am I...?


The beginning of the staining of the stringers and frames.


The initial coat of black japan is a bit patchy. It can actually be thinned to allow it to reveal the wood grain if you want. So I give these timbers two coats, and then a coat of varnish over the top. The insides of the drip channels are a bit rough looking, made, as they are, of laminated sections, so I face them with mahogany strips which will be finished bright for contrast. The channels themselves and the hatch opening will be the only black parts which will remain easily visible.


After one coat (left), and two (right).


The hatch opening with mahogany facing.



Two coats of Prekote go down on the hull bottom in preparation for the grey finish coat, but the bulkheads and hull sides can just as easily be covered in hull liner. I know it is unnecessary in this compartment, but it will give me some practice in using the stuff for other compartments where it will be used more visibly.


Undercoat (left), and the still wet coat of grey (right), which has been flattened by the addition of colloidal silica.

I'm not sure that the decision to use hull liner was a labour saving one. The number of obstructions which now have to be overcome will make the cut-out complex, and all the more so because of the fact that it is on vertical surfaces. The experience may be critical in determining whether to use the liner in the motor compartment, where the cut-outs are even more complex. I certainly will not use it in the under-seat locker, where wet things such as fenders and life jackets are going to be stowed.

The surface of bulkhead F, which holds the steering apparatus, is the most difficult, and has to be done in two halves. It was easiest to measure all the cut-outs and do them on the bench, rather than in the boat. There is enough give in the material to allow for some small discrepancies, but it is extremely difficult stuff to cut. A sharp knife has no hope from the front, some from the back. I found a scalpel most useful, with frequent blade changes.

The glue is contact cement again, this time wetting only one surface and applying the liner while the glue is still wet. That does not really allow you to move the liner around, but you can lift it and apply more glue to areas which are not sticking down. Because of the epoxy fillet which joins the bulkhead to the hull there is no sharp line between the two, and the edge of the liner looks a bit unfinished there, but I do not want to be screwing wooden fillets over it this close to the water! Besides, the unevenness of the hull bottom here, because of the fibreglass, makes it likely that fillets would still look unfinished.


Hull liner covering the starboard half of bulkhead F.

The forced down time caused by painting again, has let me get on with the Bugatti project, which has been neglected for quite a few months.

The lining goes on in five segments, and I would have to say that it was probably not a great idea. Apart from giving me some experience in using the liner there is not much to recommend it over a good paint job. It is probably more fiddly than sanding, and the joins are not invisible. What is more, contact cement turns out to be a very potent paint stripper for both Brightside and Prekote paint. Where it has spilled to the bottom and been wiped up, the epoxy is exposed again. Another coat of bottom paint will be needed.

Nevertheless, it looks OK, and I may yet decide to play with the area some more, but only after the rest of the boat is finished.


Liner on bulkhead F and the hull sides...


...then on the aft of bulkhead E


The finished appearance.


Now, if I can manage to get the subdeck glued down without catching up the liner in epoxy, I will be able to close the compartment, at last.



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