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by jacquesmm
Tue Nov 12, 2019 11:02 am
Forum: Power Boats
Topic: LM18 Madison Wi Building questions
Replies: 115
Views: 23238

Re: LM18 Madison Wi Building questions

Put a small foam profile with a triangular section and cover with glass bubbles. Any foam and the glass bubbles are very cheap.
Or make a dam with a piece of PVC pipe and pour a glass bubble putty behind it.

Glass bubbles are not strong but cheap and perfect in this case.
by jacquesmm
Tue Nov 12, 2019 9:46 am
Forum: Small Boats
Topic: MI12 Launch, and a rowing geometry question
Replies: 14
Views: 180

Re: MI12 Launch, and a rowing geometry question

Test the new height before doing anything. With the oars raised just above the water, you should barely touch your legs. I checked it all and here is how I got that high seat. The original McInnis has the rubrail 6.5" above the seat top. My design has it at 2.5", 4" difference. Why? In my design, wh...
by jacquesmm
Mon Nov 11, 2019 10:32 pm
Forum: Small Boats
Topic: MI12 Launch, and a rowing geometry question
Replies: 14
Views: 180

Re: MI12 Launch, and a rowing geometry question

I wonder if these extenders would help:
https://www.shawandtenney.com/productdi ... r-brackets

They move the pin outboard and that raises the oar above your knees. many years ago, I have used similar folding oarlocks and they worked very well.
by jacquesmm
Mon Nov 11, 2019 10:09 pm
Forum: Small Boats
Topic: MI12 Launch, and a rowing geometry question
Replies: 14
Views: 180

Re: MI12 Launch, and a rowing geometry question

The seat ergonomics are based on the well known Mc Innis design as described in the Gardner book but I located the seat height to fit me, I am 5-10. I use that height in several other row boats of that size. I row with legs extended and the oars get close to my knees but don't hit them. I often use ...
by jacquesmm
Mon Nov 11, 2019 1:20 pm
Forum: Builder's Power Boats
Topic: Jeffs FS14 LS
Replies: 21
Views: 711

Re: Jeffs FS14 LS

Page 5/12 of the building notes explains it; We show the deck extending over the sides and epoxy welded to a rubrail. That rubrail acts as a spray rail. Some builders may prefer to install a sheer clamp (= a batten on the inside), it is optional, either method is fine. The deck is in one plane, flat...
by jacquesmm
Mon Nov 11, 2019 1:12 pm
Forum: Power Boats
Topic: FS 17 DWL
Replies: 6
Views: 130

Re: FS 17 DWL

The listed DWL is arbitrary: I (the designer) can put it wherever I want but as always, I select a weight that will be close to the most common use plus a safety margin. In the case of a small boat, it can be tricky: raising the DWL will raise the cockpit sole and affect the stability. Your math loo...
by jacquesmm
Fri Nov 08, 2019 1:33 pm
Forum: Builder's Power Boats
Topic: FS18 Straight Sheer, Round Chine
Replies: 151
Views: 15633

Re: FS18 Straight Sheer, Round Chine

How did you pour it? With a syringe?
by jacquesmm
Thu Nov 07, 2019 4:48 pm
Forum: Power Boats
Topic: LM18 Madison Wi Building questions
Replies: 115
Views: 23238

Re: LM18 Madison Wi Building questions

The cleats are 1x1 nominal which is a 3/4" square batten but you can make them as thin a 3/8" by cutting strips from left over plywood. Along the hull sheer, inside, I would use strips between the frames. There can be a gap, not need to bevel anything. Those cleats are visible on the construction dr...
by jacquesmm
Thu Nov 07, 2019 10:14 am
Forum: Sail Boats
Topic: SB18, CB position vs bulb keel position
Replies: 1
Views: 103

Re: SB18, CB position vs bulb keel position

The CLR of a CB will have more lead than on a fixed keel. The lead is the difference between the sail CE and the keel (CB) center. Plus, I consider that the builders who choose a bulb keel are performance oriented and will often use the spi therefore, that sail CE will, most of the time, be more for...
by jacquesmm
Wed Nov 06, 2019 1:48 pm
Forum: Power Boats
Topic: Question for Jacques or Richard Woods
Replies: 2
Views: 90

Re: Question for Jacques or Richard Woods

The Skoota has probably more displacement but, for your program, I would pick the Skoota and not even consider the PC24. Each boat is designed for a program. The structure of each boat is very different. To try to adapt the PC24 would produce a poor result. The PC24 is an excellent open pontoon boat...