First -- I apologize to everyone for my aggressive post -- I'm sorry about that -- I got a bit revved up.

The 10-7 is a good all-around prop for the engine & it is a good fit for a wide variety of planes, trainers included, although not necessarily ideal. You will be able to take off & climb OK with that prop, & you will probably get the highest level speed with your trainer that the engine can deliver, but your model will land faster than it would with a flatter pitch prop. If landing speed is a problem, go to the flatter pitch, larger diameter prop (11-4, or 11-5).