Oh, wow. Sig Klipper. Recommended .09-.19. Well, there was no way I was going to put a "huge" .19 on her, so I opted for an Enya .09 Did alot of taxiing and had to throw it in the air to get it off the ground. I then got an OS .20. Now, that was the ticket! World Expert 5 channel. I did alot of flying with that plane.