Also below after the first stage, painted with one outer layer of 25g glass cloth followed by a second layer of 93g carbon cloth at 45 degrees and then the balsa skins.
The bottom picture gives you an indication of how much or little carbon goes into the spars, this UHM unidirectional carbon is 3m by 0.244m and this is all used up!
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The bottom picture gives you an indication of how much or little carbon goes into the spars, this UHM unidirectional carbon is 3m by 0.244m and this is all used up!
Is this the UHM from RG 0.4% eleongation? Have you used it in top and bottom layers?
Trying to make a decision on which UHM to use myself.
Any chance on sharing your design numbers for the spar?
Love your work - cheers jeff
jeffery
Yes it is the UHM supplied by R&G
Spar caps are 50mm at root 25mm at tip. Two layers full span 1500mm, 1 at 1000mm 1 at 500mm, same top and bottom. No real cals done just looked at what others are using. Also learning from experiance. Last model out of the moulds used more spar material and was way to strong. Also the other consideration is how to get the best yield from the roll of material as you now UHM don't come cheap.
Mike Challinor
Hey Jeff
Hope you are well?
In the first model we used just HM unidirectional carbon so increasing the strength using UHM and reducing the amount should result in a lighter construction for the same strength.
One thing I can say is the UHM is very easy to work with and cuts nice with a roller cutter.
Good luck with your work.
Neil Harrison (Harry)
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