vtol-guy,

I dont know how much room you need to try this experiment, but assemble the rockets to the trainer as planned, then turn on your plane and radio (engine off), ignite the rockets and see if you can control the plane with rudder and elevator on the ground. If you can, then you'll have an idea of what to expect in the air, at least thrust wise.?!

Wish I could be there...too bad your not closer to my field, you could try it here.