@gary how is the power output at full rpm? did you also buy their voltage regulators?
@greg it is expected to be a little bit over two hours. Largely depends on how the construct will perform in real flying conditions. Design for the fuselage is based on Stal-5 with alterations: angle of the main chassis (to accommodate payload and new engine placement), engine placement (single, placed on the rear / pusher configuration - Marvelette) and re-designed tail fins. Edit: ...or it might crash after 1 minute of flight we'll see I guess