If you haven't bought fuel yet make sure that it contains at least 18% oil content. 10% nitro works well, anything with higher won't make much difference on a trainer and is more expensive. A mixture of castrol and synthethetic works best for lots of reasons that I don't want to get into now. Look for what is called "Sport Fuel". The best size props I like for 46 size engines is the 11-5. Gives you lots of pull when you need it and good speed when you want to fun. [8D]