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Carbon Spar cap pultrusion sizing

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Foundationer

Well-Known Member
Joined
Nov 29, 2016
Messages
246
Location
London
I've got a question for you knowledgeable types:

I've sized my spars and found a supplier of top quality carbon pultrusions [ https://www.dpp-pultrusion.com/ ]… The question is do I want to have a very small number of large strips, or a larger number of small strips? If I go 16mmx2mm I need about 6 at the root, If I go for 10mmx1mm I need loads but I save a bit of weight. Seems to me fewer strips = easier handling, more reliable process and all round happy times.

Bonus question: Does 180 mm^2 top cap / 140mm^2 bottom cap at the root for a 9m span, 140mm deep spar, 300kg aircraft to n4.5 / 100 knots cruise sound like it's in the ballpark?
 
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