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Old Apr 14, 2016, 10:34 PM
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1:20 RHS 70 Shearwater Hydrofoil scratch build

Finally starting my hydrofoil build. I have been wanting to do one for years but kept getting side tracked. I decided on the RHS 70 because of it's simple, non stepped hull, single shaft arrangement and surface piercing foils. I just pulled the master from the plaster molds and everything came out great.
Here are the specs for now:

1:20
43" long
9" hull beam
single outrunner
2" 3 blade prop
twin rudders
polyester hull
Sintra deck and cabin
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Old Apr 14, 2016, 10:59 PM
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Cool .

Mark
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Old Apr 14, 2016, 11:00 PM
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Looking forward to seeing how this is done. I have a 32nd parallel German WW II hydrofoil kit. It does not have the running hardware but it uses the same type of foil. I would like to one day have it running.
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Old Apr 15, 2016, 12:36 AM
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Off to a great start Dennis.

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Old Apr 15, 2016, 10:48 AM
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Plaster mold? So simple, of course!

Any special kind of plaster? I guess I'd be worried about the surface strength... but patching and even new molds should be a cinch!

Ever try a split mold (L/R) in plaster?
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Old Apr 15, 2016, 11:13 AM
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Pat,

Ultracal 30...Sent you some info....


Making an Ultra Cal Canopy Mold for Kawasaki Ki 100 Part 1 Jan 22 20166 (21 min 22 sec)
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Old Apr 17, 2016, 05:40 PM
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Hull is layed up and curing in the California sun for a few days.

DH
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Old Apr 18, 2016, 07:57 PM
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Watched the video tutorial and it was very interesting. Are you using gel coat as a base for the cloth and resin? From the top the hull kinda has a pt boat shape. Looks great.
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Old Apr 19, 2016, 09:14 AM
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First hull is having some gel coat curing issues in the corners. May need to lay up another..


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Old Apr 24, 2016, 09:58 PM
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It's about dam time.
Color me watching!opc orn:
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Old Apr 25, 2016, 10:59 AM
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I actually found the 3D cad of the boat you sent me years ago.
Any thoughts on the foils?

The only thing on the Ultra Cal it's so darn heavy.
Steve does not call it stone for nothing. Dave

Actually I take back the CAD comment. It was a different hydrofoil. Ha!
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Old Apr 25, 2016, 11:26 AM
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Ultracal is heavy but very cost effective and fun to work with. As for the foils, A combination of sheet brass and urethane foils that key into the brass. We need some adjustment so I plan to make everything removable with hardware.


DH
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Old Apr 25, 2016, 03:14 PM
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You know I am nuts about all things hydrofoil.
My second love after subs.

Yours looks similar to my PT50.
I like the twin rudders better though.
My ultimate build would be to do a water jet foil.

Check out this bad boy!
Tested by the Canadians in the late 60's.
It hit 63 knots.
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Old Apr 25, 2016, 03:28 PM
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No, this!

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Old Apr 25, 2016, 03:31 PM
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Pat, You're halfway there.......Get on it!
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