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by jacquesmm
Fri Aug 23, 2019 4:39 pm
Forum: Power Boats
Topic: PC24 Question for Jacques
Replies: 1
Views: 24

Re: PC24 Question for Jacques

I wonder what he means by rabbet. There are no rabbets in my designs.
Could it be the shaft length?
That can be 20 or 25". The bracket is designed for 25" = 635 mm.
by jacquesmm
Fri Aug 23, 2019 2:33 pm
Forum: Questions before purchasing the plans and announcements..
Topic: Powerboat Fuel Efficiency
Replies: 40
Views: 3190

Re: Powerboat Fuel Efficiency

The original Tina was fitted with a big V8!
It is difficult to imagine a 25 to 30' hull that would move about 8 knots with 45 HP unless we go for an unusual beam to length ratio.
by jacquesmm
Fri Aug 23, 2019 12:27 pm
Forum: Power Boats
Topic: Flexokore
Replies: 3
Views: 48

Re: Flexokore

Flexocore is balsa. Balsa is always cheaper and I stay away from it because it may absorb water. However, for a very small boat like the MI, I would use it. The boat will not live in the water and will stay dry. Later, for the LB26, I insist on a quality core: Divynicell, Airex or Corecell. For this...
by jacquesmm
Fri Aug 23, 2019 9:57 am
Forum: Power Boats
Topic: Long shaft versus short shaft question fs18
Replies: 3
Views: 76

Re: Long shaft versus short shaft question fs18

The transom cut will be 5" lower with all that entails. A 15" shaft is too short for my taste but if you don't go offshore it can be fine.
by jacquesmm
Fri Aug 23, 2019 9:55 am
Forum: Questions before purchasing the plans and announcements..
Topic: Powerboat Fuel Efficiency
Replies: 40
Views: 3190

Re: Powerboat Fuel Efficiency

Those boats are very narrow and that is what makes them so efficient.
I can guess what will happen if I design one, remarks like: "I like the boat but can we make her wider?"
by jacquesmm
Thu Aug 22, 2019 8:45 am
Forum: Power Boats
Topic: xf 22
Replies: 3
Views: 91

Re: xf 22

The plans specify fiberglass splices. Those are strong and easy to make. It is difficult to make a good scarph, I would not take that risk especially since splices work perfectly well. For our system, with all the glass layers in and out, splices are logical. If you use scarphs, keep in mind that th...
by jacquesmm
Wed Aug 21, 2019 3:11 pm
Forum: Builder's Power Boats
Topic: Coach's SC-16 in MA
Replies: 134
Views: 5502

Re: Coach's SC-16 in MA

The decks say woven tape for the decks: use what you have left 9 oz. if possible.
For the sole, use 12 oz. biaxial and if you don't have enough leftovers, use 2 layers of 4 oz. or one layer of 9 oz.
by jacquesmm
Wed Aug 21, 2019 3:06 pm
Forum: Power Boats
Topic: XF 20 flats boat
Replies: 7
Views: 256

Re: XF 20 flats boat

Ideally, the panels should meet on their inside corners. Fill the gap wit putty and grind to a round edge.

Image

That is how it will look before rounding the corners.
by jacquesmm
Wed Aug 21, 2019 3:03 pm
Forum: Power Boats
Topic: FS19 Scaled Down 5% - Jacques Question
Replies: 2
Views: 129

Re: FS19 Scaled Down 5% - Jacques Question

If you pull heavy skiers, more than one and have 4 people in the boat, go for the 115.
115 is a lot of HP for that small boat, I would feel better with a 70 but since the plan is to pull skiers, go for the larger engine.
by jacquesmm
Tue Aug 20, 2019 1:17 pm
Forum: Power Boats
Topic: XF 20 flats boat
Replies: 7
Views: 256

Re: XF 20 flats boat

Please see our tutorials like:
http://bateau2.com/howto/sg101_8.php

Grind a round corner of about 1/2" radius.