Search found 61 matches

by sands35
Thu Oct 02, 2014 5:51 am
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

It varies by state and local governments, but typically licences are required only for youths driving PWCs (jet skis) (not including commercial vessels). Boats are registered though - the tax man needs his take. It is incumbent on the boat operator to know and understand the rules of the road and op...
by sands35
Mon Sep 29, 2014 5:49 am
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

Boats with 0 deadrise at the trasom will tend to plane with a nose up attitude. Take a look at photos of classic boats at plane, you will see the transom is typically really low in the water. Boats with a constant deadrise will tend to plane with the buttocks (lofting term) parallel to the water. (a...
by sands35
Sun Sep 28, 2014 2:43 pm
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

Tahoe plans are not free to use. Many of the early Hacker, Gar Wood, etc. designs are not copyright protected, so are free to use. Basically, you want the CG to be behind the LCB. There is a reason why most modern boats have the engine mounted as far aft as possible. But you can't just arbitrarily m...
by sands35
Fri Sep 26, 2014 6:42 pm
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

LCB = longitudinal center of buoyancy
CG = center of gravity

The boat will change pitch until the cg and the lcg line up. Of course that is at displacement speeds.

I can post the table of offsets for a 25' version next week. The plans are in the public domain.
by sands35
Wed Sep 24, 2014 12:39 pm
Forum: Power Boats
Topic: Inboard Engine Options?
Replies: 10
Views: 4697

Re: Inboard Engine Options?

There are different fuel handling, spark and carburation requirements for a marine engine. Also need to think about access to the oil filter. Basically you can't just put an auto engine in a boat and expect it to pass CG safety checks. There are spark arrestors on the starter, intake and dizzy and f...
by sands35
Wed Sep 24, 2014 5:53 am
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

OP - have you looked at some of the older Hacker designs? He has some in the 18-26' range that are about what your design is. Even changing the lofting for the above the chine work is not trivial. Best that you have a 3D CAD program to help you like DELFTship or something. DELFTship is free and purp...
by sands35
Tue Sep 23, 2014 12:54 pm
Forum: Hankinson designs
Topic: Give Tahoe 23 a more racing look.
Replies: 26
Views: 10505

Re: Give Tahoe 23 a more racing look.

As long as the motor stays in the same place, taking out the seats from the 1st row and replacing it with deck will likely be CG neutral. If you need to trim it, you will have a big battery you can move around. Narrowing the sheer doesn't do much to buoyancy as long as the chine (at or below the wat...
by sands35
Fri Sep 19, 2014 12:02 pm
Forum: Wood and Plywood
Topic: White Pine
Replies: 8
Views: 4574

Re: White Pine

http://www.wood-database.com/ is a great source for basic info on wood.
by sands35
Thu Aug 21, 2014 11:34 am
Forum: Hankinson designs
Topic: 3/4 scale Jet Barrelback?
Replies: 8
Views: 3168

Re: 3/4 scale Jet Barrelback?

How about: http://robmill54fl.tripod.com/ and: http://www.boat-links.com/Ideal/XXII.html You should be able to get your local library to loan you a copy of: MoToR BoatinG Magazine's "Ideal Series" of Books THE RUNABOUT BOOK VOLUME 22 Copyright, 1944 There are a number of Hacker boats in your desired...
by sands35
Thu Aug 21, 2014 11:22 am
Forum: Hankinson designs
Topic: split mahagonay
Replies: 4
Views: 2700

Re: split mahagonay

Yes, put a block of wood under the clamp so the force is even on the face of the wood.

I'll bet you won't see it when installed. It may be covered by a cutwater anyway.
by sands35
Thu Jun 05, 2014 10:55 am
Forum: Power Boats
Topic: Bow High until planing - Gentry
Replies: 23
Views: 5843

Re: Bow High until planing - Gentry

Glenn Have you tried the simple test of putting a couple of 20 litre containers filled with water as far up front as you can get them and see if that holds the nose down. I had a 3 metre tinnie with your problem and with a little bit of weight shift the problem was fixed and it planned better too. ...
by sands35
Fri Apr 18, 2014 7:19 am
Forum: Hankinson designs
Topic: Rudder placement
Replies: 27
Views: 9186

Re: Rudder placement

The real key is to not work it to much and when you get it wrinkle free and wetted out leave it alone until it hardens. Then you can apply a second coat. I did mine about 12 hours after the first coat. Robert That is the hardest thing to learn. It never gets better by messing with it more. Resins, ...
by sands35
Wed Mar 26, 2014 12:52 pm
Forum: Wood and Plywood
Topic: CNC router frame kits
Replies: 7
Views: 5584

Re: CNC router frame kits

For the frames - are you planning on cutting the entire frame out from one sheet? i.e., more or less like a U shape? If yes, there will be lots of waste. Can you do a layout where the frame bottom and the frame side are separate and you glue them together with a lap joint or a doubler at the chine? ...
by sands35
Wed Mar 26, 2014 12:46 pm
Forum: Power Boats
Topic: photos finished mahogany planking with staples removed?
Replies: 13
Views: 3436

Re: photos finished mahogany planking with staples removed?

I have not done staples or vaccum - but I gotta say that vacuum bagging looks easier!

Beautiful job regardless.
by sands35
Tue Mar 25, 2014 7:22 am
Forum: Hankinson designs
Topic: Biscayne 23
Replies: 17
Views: 6611

Re: Biscayne 23

Very Nice!

Plans for a cutwater?

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