i buildt a flying wing with a os 15 la engine span 800 mm cord 250 mm profile mh46 reflexed airfoil.. wigth 600 gram emty

it is very stable too fly ( and fast) at first it hat a tendensy too dutch roll but i cut the tail down a littel and that eliminated the problem.

my remaining problem is wenn loop it very hard it will stall out of the loop. is there a solution too that, will making the tailerons tapper out too the tips help you think?

sorry fore my spelling %&/¤

If any plane snaps out of a loop, it's actually stalling the wing. Some airfoils simply won't loop tightly. Two solutions you might try is more speed and/or less elevator.

Dr.1

Or, a more powerful engine to pull it on through the loops. With enough power, most anything will get through a loop.

3dbob