Uby I have 3 US41 and I am extremely pleased with thier reliability, ease in starting cost to operte etc. The people at US Engines are most helpful and prompt. The stortcomings are that they are heavy ie 4 Ibs. for 35 & 41 and they don't produce a lot of power. If your planning on going 3d I don't think they will work. They will probably work in a pattern ship depending on the model. I use them for large scale models where I need the weight and the power gives me scale like performance.

Cheers BH