I ahve a delta of my own design with TT 36 Pro and throttle pipe with a 8*8 prop that eats up the sky except this sunday when it bit the dirt and cartwheeled down the runway after a hand launch.

Moral of the story damb on of switch to close to hand hold result palne switched off on launch... result bust prop and leading edge to repair... good job I build em strong.....

Lesson learnt put the on of switch in a less vulnerable spot away from my big fingers.....