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Thread: Composite Warbird Build 1/7th P-40E Warhawk Mould How To Reply to Thread
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03-05-2014 02:30 PM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

I couldn't find my old homemade hotwire cutter. (an old battery charger, a block of wood, two copper pipes, and a guitar string worked just fine for many moons...)
This is a small investment that will save many, many, hours of cutting balsa ribs, or paying for the laser cutting etc...
I have to say, it's a beautiful little tool that I should've bought 30 years ago.
The wires it uses can be bent to shape. A small Vee profile around the perimeter of a rib might do well to hold the cabosil/milled fibre goo in place during assembly.

What you see in the photos is the aluminum cutting template in white and the foam rib in blue.
I first printed paper templates to scale and later transfered the paper template to the aluminum shown here.
Here's a tip - check your yellow pages for custom eavestrough - they buy aluminum sheet stock by the roll...


Proxxon Tools, Hotwire Cutter Thermocut 12/E (12v DC)

Voltage
12v, 60w, 50/60Hz

Cutting Wire Temperature
300 - 660 ºF
(150 - 350 ºC)

Maximum Extension
7.9" (200mm)

Cutting Height
5-3/4" (150mm)

Wire (NiCr8020)
11.4" Long, 20 gauge

Weight
0 lbs (3.0kg)


02-18-2014 11:38 PM
Nick Milligan
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

Ah, the two chair fly.
Looks great James!
02-18-2014 04:46 PM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

Year Six I think ??

Clear packing tape is not very good in compression but applied around the periphery like this it works very well in shear.
There are no internals here. By taping this up for a quick touchy-feely session, it should be quickly apparent that little internal structure is required at this scale. The inherent beam strength of the cast trailing edges coupled with the rigidity cast into the lower skin by including the wheel and flap bay details yields an empty shell that is almost strong enough without internals. Very promising, not to mention motivating and satisfying to stare at...

[a href="http://s1069.photobucket.com/user/Two_Bulldog/media/P82000012_zpsfc4ad5fa.jpg.html"][img src="http://i1069.photobucket.com/albums/u475/Two_Bulldog/P82000012_zpsfc4ad5fa.jpg" style="max-width:100%;"][/a]



05-24-2013 04:00 PM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

Crude initial hand layup 410 grams or 14.5 Ounces or 0.9 lb
Part looks great. Still stiffening up a bit.




05-24-2013 03:18 PM
Max
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

In your updates, I always find something new to learn. Keep on going.....!!!
05-23-2013 08:48 AM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To




05-22-2013 10:46 AM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

Less is more....



05-21-2013 09:48 AM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

So strong they’re scary and so light it makes you look twice when you pick one up…
Al/GRP Laminated D-box Leading Edges



02-11-2013 10:45 AM
impba15713
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

great work on your projects for the plane.

What is your plan for the internal structure of the wings and fuse?
01-17-2013 02:02 PM
b1heqh54
Re: Composite Warbird Build 1/7th P-40E Warhawk Mould How To

http://youtu.be/OO6xbs-fbUk
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