KR> Outboard fuel tanks
I have had three spam cans with wing tip tanks. And believe me. I have not always had picture perfect lands through out my flying career. And never have I had a problem that surfaced or that my annuals found any stress points on the wing structure. So, my inclination about the stress indicated by others is something that anyone should consider. But on the other hand I know that for me that until some prof is set in front of me. I will be fine with tip tanks. And yes, I am installing tip tanks on my KR1. The fuel is at least 6.5' further away from me in the cabin. And it is only 2.3 gal. per side and another 5.8 gal. in ea. outside wing panel in alum. tubes. I will be using an auto fuel pump to bring the fuel to the engine with an electric fuel pump boost. I have a picture on my desk top of a KR2 with tip tanks in flight. I guess I just need more prof if I were not to install them. For now, tip tanks a coming. M. Greg Martin
KR> Outboard fuel tanks
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.
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. Perhaps external tip tanks a la T33? I am aware that foam dissolves in gasoline..
