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by Kevin Brooker
Mon Mar 12, 2018 12:42 pm
Forum: Hydrofoil Builders
Topic: Foam cored wings (another way)
Replies: 11
Views: 3072

Re: Foam cored wings (another way)

I run the pump full on with no regulator on foam core R/C wings and have never had a crush problem. Much simpler. Most times it pulls .8 ATM. I'll try to find my older molds and make up a pert to show the Easter egg method. There are simple ways to make up the leading edge and I'll try to find the r...
by Kevin Brooker
Sat Mar 03, 2018 7:34 pm
Forum: Hydrofoil Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 14763

Re: How thick can I lay carbon fiber?

True on the ski building but many of the methods used in r/c are directly applicable. Fur better resin/cloth ratios the vac infusion methods can be applied as can using a silicone plug to more evenly apply pressure and fill voids in wet hand layups. Many molding methods are very well illustrated and...
by Kevin Brooker
Sat Mar 03, 2018 2:02 pm
Forum: Hydrofoil Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 14763

Re: How thick can I lay carbon fiber?

Yes, like an Easter egg. After the mold is constructed another piece is indexed and added to one side of the mold. I use 3-5mm thick plexiglass. This joggle gasket is cut to parallel the outline of the molded party lip but hangs into the mold the thickness of the layup. Make the layup as usual and g...
by Kevin Brooker
Fri Mar 02, 2018 10:29 pm
Forum: Hydrofoil Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 14763

Re: How thick can I lay carbon fiber?

For gluing up there is a method of building a lip or ledge a few mm thick which slips inside the other half increasing the gluing surface for a stronger bond. I'll see if I can find a name for the process. It is very simple to do but difcukt to describe.
by Kevin Brooker
Fri Mar 02, 2018 1:23 pm
Forum: Hydrofoil Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 14763

Re: How thick can I lay carbon fiber?

If you can find the DVD series on building composite wings for r/c aircraft by Phil Barnes much of what is needed to build wings for hydrofoiling is covered. The r/c world is a great place to look for DIY info. These guys have lots of experience molding stuff. The adaptation is adding a core to hand...
by Kevin Brooker
Fri Feb 16, 2018 1:38 pm
Forum: Hydrofoil Builders
Topic: More wings, the hard way?
Replies: 56
Views: 13774

Re: More wings, the hard way?

If we are worried about creating garbage stop using composites. aside from the embedded waste from production the manufacturing process is very dependent upon consumables. As individuals we can reduce this but on a production scale the waste is enormous. Prototyping is hugely wasteful. Make a few mo...
by Kevin Brooker
Sat Feb 10, 2018 2:10 pm
Forum: Hydrofoil Builders
Topic: fuselage fabrication
Replies: 36
Views: 8967

Re: fuselage fabrication

Be sure to put a layer of glass between the Ti (or any other metal parts) and the CF. if CF is in context with metal there is a galvanic reaction (small electrical current caused by dis similar metals) and things will corrode. CF. is not metallic but is conductive andchwmically behaves like a metal ...
by Kevin Brooker
Wed Dec 13, 2017 1:26 am
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 82
Views: 9086

Re: How to turn a hydrofoil - and what is YAW ?

Joyrider1. I missed the surfing part and readout as w/ kite. I'll concede the act of trying to imitate a turn by trying to impart yaw is correct but pure yaw will not turn.

Mitaka had a much clearer explaination then mine and thanks.
by Kevin Brooker
Tue Dec 12, 2017 9:21 pm
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 82
Views: 9086

Re: How to turn a hydrofoil - and what is YAW ?

We impart yaw by pulling against the kite. If we just twist the yaw will be imparted until we try to realign ourselves ( untwist) when it will return to the pre twist state. This is what happens to the astronaut. On a surfboard we twist and roll the board which now tries to move under us giving us b...
by Kevin Brooker
Tue Dec 12, 2017 7:01 pm
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 82
Views: 9086

Re: How to turn a hydrofoil - and what is YAW ?

From the aero guy: positive stability is when a craft is displaced and returns to the original pre-displaced orientation. Neutral stability is the craft remains in the new displaced orientation. Negative stability ( unstable) is when the displacement amplifies itself. The stability definitions can b...

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