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I have a 12-8 prop. I had a 13 on it which is the smallest as per the OS manual but my instructor told me it was too big.</p>

I did the break in myself. It was hard to reach for the rich and the lean back and forth.</p>

I have to say it's my 4th OS engine but the one I had the most problems breaking in.</p>

After the break in, the next 3 trips on the field have been nothing but trouble. Engine would not start. Tuning was a pain.</p>

Each time I had someone else tune it for me. The idle needle was way off (way too rich).</p>

But now the engine is running better. I can only guess the speed. I fly my Escapade that reach about 65-75 MPH.</p>

This Big Stick is not anywhere close. I usually run my planes like my boat (cruising speed around 75% throttle).</p>

I think WOT will damage the engine in the long run. Am I wrong?</p>

It's not just the speed. The maneuvers are way slower than my previous Stick 40. Maybe I need to put more throw on the ailerons.</p></font>