You might want to check out the United Hobbies 5"-I bought one to experiment with but haven't matched it up to a motor it, as yet. I have a 104" U2/TR1 on the bench about 60% done. I have a WeMoTec Midi with an Aveox/Phoenix 60 I want to try in it. I originally built the fuse around a Turbax/Rossi combo, which at that scale, makes the fuselage larger than scale. I think for a 100", the Midi size might work out better. Just my opinion. Bill