Charles, Your comment about the outer wing being the least stressed point on the wing, the reason that is because there is no weight there & the aerofoil is not holding up much of the a/c. If you put 30 lbs of fuel out there the stress could change from the least stressed to the most stressed. If you did a heavy landing with 30lbs of fuel at the win tip it may turn into a disaster. Be careful.
Robin. ----- Original Message ----- From: "Charles Smith" <cwssyst...@centurylink.net> To: <kr...@mylist.net> Sent: Tuesday, October 26, 2010 8:42 AM Subject: KR> Outboard fuel tanks Watching this discussion of fuel tanks closely. I have built a Dragonfly (hasn't flown yet) and found the construction technique to be fast and easy (you have to be fast when applying epoxy). However, I want to start over with a conventional design that fits the requirements of E-LSA. I would like to use the same construction techniques used in the D-fly but do not know what the parameters or results of putting a hollow space inside of a foam core wing would be but think it might be doable as wing tip tanks, just hollow out the outermost 'x' inches of wing and use it as the tank, the least stress place in the wing. I am looking at the KR design as the basis for this plane and soaking up any ideas I can run across to help me out.
