Speedwing Contest Design

Today I had the final crash of the prototype speedwing. The 2200 mAh battery cantilevered over the leading edge is now about 1" shorter.... Nothing like a high speed, full throttle perpendicular impact into ice!
So, I thought it was about time to start working on the "real" design. So far, here are the major changes from the prototype:

• Tip wing section is about 60% of the root wing section- hopefully this will avoid the nasty tip stalls of the prototype
• Reduced wingspan to 24" from 40". Even with this major decrease in wingspan, with the increase in wing tip chord length the wing area is still close to the prototype - about 302 square inches
• Removed winglets. They kept on breaking on the prototype. If this doesn't have enough directional stability I'll add them later.
• Added cockpit to cover batteries, and allow longitudinal orientation of the batteries.This will also reduce the need to core out the wing as much- which should make the wing much stronger.
• Extend spar across wing center joint. 

Estimated specs:

• Wingspan 24"
• Wing area 302 square inches
• Estimated all-up weight: 1.1+ pounds ~ 500+ grams (this seems to light, but maybe it's correct)
• Max power: 1100 watts