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by jacquesmm
Wed Oct 18, 2017 11:54 am
Forum: Builder's Small Boats
Topic: PY12 - Plyak build
Replies: 28
Views: 648

Re: PY12 - Plyak build

It is required.
I reply from memory. In most of my designs, foam is optional but in some cases I use the foam as part of the structure.
If the plans say to use it, use it.
by jacquesmm
Wed Oct 18, 2017 10:18 am
Forum: Power Boats
Topic: FS14 front deck
Replies: 2
Views: 50

Re: FS14 front deck

Yes you can do but the deck will be very small and you need to add a breasthook.
by jacquesmm
Tue Oct 17, 2017 7:57 pm
Forum: Builder's Power Boats
Topic: Bruce Crandall Flyer Hydroplane
Replies: 349
Views: 14340

Re: Bruce Crandall Flyer Hydroplane

Oops, sorry Peter, you found that one first.
I like the exhaust sound.
by jacquesmm
Tue Oct 17, 2017 1:49 pm
Forum: Builder's Power Boats
Topic: Bruce Crandall Flyer Hydroplane
Replies: 349
Views: 14340

Re: Bruce Crandall Flyer Hydroplane

More links:
https://thekneeslider.com/harley-davids ... peed-boat/

I should be working on designs instead of searching the web.
by jacquesmm
Tue Oct 17, 2017 1:40 pm
Forum: Builder's Power Boats
Topic: Bruce Crandall Flyer Hydroplane
Replies: 349
Views: 14340

Re: Bruce Crandall Flyer Hydroplane

Very nice link but I can't read the text well.
It looks water cooled but he does not show much.

I forgot to mention something about raw water cooling: it will crystallize the salt and quickly clog the blog. Don't.
by jacquesmm
Tue Oct 17, 2017 1:34 pm
Forum: Resins, Fiberglass and Paint
Topic: Gel and cure times
Replies: 4
Views: 61

Re: Gel and cure times

Here:
http://bateau2.com/howto/cure_times.php

but gel time, pot life, depends on the quantity. You can also play with temperature: keep the resin in a cold (fridge) or warm place.
by jacquesmm
Tue Oct 17, 2017 1:31 pm
Forum: Builder's Small Boats
Topic: PY12 - Plyak build
Replies: 28
Views: 648

Re: PY12 - Plyak build

It's up to you. You don't have to add foam, the hull material floats but it is a good idea to add some foam to provide extra buoyancy. In that boat, I would put some foam in the ends. A 2 gallon kit expands to provides 480 lbs of buoyancy but it is difficult to pour that much foam in the small Plyak...
by jacquesmm
Tue Oct 17, 2017 10:55 am
Forum: Questions before purchasing the plans and announcements..
Topic: DE23 displacement speed
Replies: 2
Views: 73

Re: DE23 displacement speed

No wind? 10 HP (7.5 Kw) will move it but I would go for a 25 HP (around 20 Kw) to have safety margin.
by jacquesmm
Tue Oct 17, 2017 9:36 am
Forum: Anything else and for sale. . .
Topic: YANMAR LAUNCHES THE DTORQUE 111 TURBO DIESEL OUTBOARD
Replies: 17
Views: 309

Re: YANMAR LAUNCHES THE DTORQUE 111 TURBO DIESEL OUTBOARD

It is not Yanmar's first attempt at outboard diesels. They had a 27 HP 3 cylinder in the 80's. It was a total failure mostly due to uneven lubrication and cooling. The crankshaft was vertical and the top cylinder wasn't happy. I don't think it is going to work: it's heavy and very expensive plus, th...
by jacquesmm
Tue Oct 17, 2017 9:32 am
Forum: Builder's Power Boats
Topic: Bruce Crandall Flyer Hydroplane
Replies: 349
Views: 14340

Re: Bruce Crandall Flyer Hydroplane

About cooling. Yes, direct cooling is one of the options but keep corrosion in mind. IF the boat lives out of the water (on trailer) and if the engine is flushed each time, it will not corrode too fast, probably 3 or 4 years. That is a wild guess, those motorcycle engines probably have thin walls. Y...