I am getting a Sig Kadet Senior as a trainer plane and planned to put an OS FS70 Ultimate in the plane, but it seems the 70 Ult is not going to be stocked until late Oct or sometime in Nov. Time to rethink the engine choice.

What I am now looking at is the OS FS91 II Surpass pumped. My concern is that this may be too much engine for the Kadet Senior.

Any advice, keeping in mind that I want to stay with a 4 stroke engine.