Re: New Carbon Spar Manufacturing ???
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Not sure if it was just a sales ploy on the part of QAC, but they claimed that the airfoil was too thin to support the landing loads using any of the typical spar construction methods of the time. Not sure they ever really validated that by modeling or testing, or if they just went ahead a built the tubular spar and tested that only.
In any case, the GU airfoil causes the wing to be quite a bit thicker. The thicker the profile, the lower the loads on the traditional I beam shear web and spar caps.
The thin LS-1 airfoil would probably double the loads on the spar caps under the same loading conditions as the GU, so the I-beam construction would have to be beefed up substantially .
I would not suggest building that way without first doing the mechanical modeling. That said, there are people who monitor this list who are perfectly capable of doing those models.
Sent: Tuesday, September 03, 2019 3:33 PM
Subject: Re: [Q-LIST] Re: New Carbon Spar Manufacturing ???
Regarding canard building. The Dragonfly has a built in place spar