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by Kevin Brooker
Sat Apr 20, 2019 12:06 am
Forum: Gear Builders
Topic: Plywood surf foil wing
Replies: 22
Views: 2097

Re: Plywood surf foil wing

TomTom, By using the drop cutter as in your photo the foil can be changed from one end to the other by using a different template on either side. if you need three adaptations re use the template of the left (for discussion) and put it onto the right end of the next block. It will match exactly and ...
by Kevin Brooker
Fri Apr 19, 2019 12:54 pm
Forum: Gear Builders
Topic: Plywood surf foil wing
Replies: 22
Views: 2097

Re: Plywood surf foil wing

Years ago my hobby was building Hand and Discus Lunched Gliders. These had a 1.5 meter wingspan and some as short as 750 mm. All were foam core with vac bagged carbon and kevlar skins. Cutting the cores was done with a hot-wire pulled over templates. With very few mods this can be adapted to foils f...
by Kevin Brooker
Fri Apr 12, 2019 12:35 pm
Forum: Gear Builders
Topic: Pneumatics
Replies: 20
Views: 4618

Re: Pneumatics

The I-beam press will allow you to shape the wood and ski building forums have great info on using them. If you resin infuse the laminates you have time to set the dry fabric (spray adhesive works great) and see if the vac is steady before adding resin. Infusion is also great since you can stop at a...
by Kevin Brooker
Thu Nov 01, 2018 1:40 pm
Forum: Snow / Land
Topic: Why is everyone hating on old kites ?
Replies: 25
Views: 3575

Re: Why is everyone hating on old kites ?

My quiver started in the 90s with 2 line fixed bridle kites with home grown releases base upon skydiving cutaways connecting an old climbing harness to the kite. Don’t crash and carry some form of deadman to secure the car while disconnecting to reset the kite. Fun and compared to anything from this...
by Kevin Brooker
Thu Jul 26, 2018 10:05 pm
Forum: Gear Builders
Topic: How to build a carbon wing in a 2 part mold?
Replies: 6
Views: 1556

Re: How to build a carbon wing in a 2 part mold?

A very light mist of spray adhesive (3m-77) on one side of the cloth before cutting holds it together so the shape will not distort and it keeps the edges together. The mist just dissolves in the epoxy and doesn't change anything.
by Kevin Brooker
Mon Mar 12, 2018 12:42 pm
Forum: Gear Builders
Topic: Foam cored wings (another way)
Replies: 11
Views: 4048

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: Gear Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 17130

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: Gear Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 17130

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: Gear Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 17130

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: Gear Builders
Topic: How thick can I lay carbon fiber?
Replies: 47
Views: 17130

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...

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