Do have all the mixing on possible, spoilerns, flapperons the bizness! Im using a irvine 36. Now ive used a small engineon a light wight funfly wi wouldnt ever go above a 39 (irvine). Thats why i always say forget the 46s as theese just add weigh, use a 32-39! i got a 2.5:1 power to weight ratio on my cougar!