Actually not a bad idea- bifold tips. Accordian them up to create a
winglet and extend them for increased span. Plus your plane would fit
through a smaller hangar door

Joa

(Paul Tomblin) wrote in message ...
I saw the subject line, and was immediately struck by the thought that
LoPresti probably have a line of hangar door tips, and they claim to speed
up your hangar door by 2-3 knots.