Airframe for 20+ min Endurance

I want to implement complete APM missions (with Auto Takeoff and Auto Landings) with minimum endurance of 20 minutes. The constraints are:

Wing Span < 1700 mm
Gross weight < 1700 g
Endurance > 20 minutes
No payload requirements except APM2.5, GPS, and Xbee.
Electric Powered, Foam build

Most of the threads I've read for endurance flights seem to cross either span or weight limit I've set. Any airframe suggestions for the above constraints ?

I've looked up a few aircrafts mentioned in previous threads, but am not sure about the endurance they provide.

Skywalker 1680 V6 FPV Platform EPO Kit

EPP-FPV 1.8M X-Large EPP & Carbon Fiber R/C Plane

Thanks.

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Søren Kuula August 7, 2013 at 7:37am

I had 45 min. endurance with a GoPro as payload with a modified EadyStar. The mid. is to cut off the whole tail at the root on the fuselage, and replace it by one of balsawood. The tail boom was 2 9x9mm balsa sticks glued into grooves that I cut in the bottom of the fuse. This allowed an 8 or 8.5 inch prop to be installed with a suitable motor (about 1200 kv at 3s and 60-75 grams size). With the original size prop I got only 15 minutes on the same battery. It looked awful but it worked well...
Regards Soren

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Airframe for 20+ min Endurance

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