This flight was on an 1806 motor, 600 2s battery. I got a 10:30 flight time! It goes faster with my 850 3s batteries, of course.
The hatch is flimsy; I'm gonna redesign it to be stiffer, probably by adding a curve of paper over the whole thing.
There's a weird problem. When I pull back on elevator, the plane goes into a loop very stably. but as I keep pulling farther back, I reach a point where the plane suddenly rolls violently. I'm thinking that the elevator might be stalling on one side. And this might be partially caused by the twin fins. But I don't know. What's your opinion?