Help on flying the 109

[Gollum]

Wow. didnt think there would be so many opinions.. Anyone know the real story? Also, my problem was not solved by opening all radiators. For some reason no matter what I do I get an engine vibration that starts about 20 min into flight that gets worse and worse as the flight goes on until its a constant shake rendering my plane unflyable.

My flight consists of constant 2300 RPM, 3/4 throttle, mixture auto, both radiators full open.

Have also tried with radiators in what I think is the middle option for water and halfway open oil radiator.

Have also tried both with constant RPM at 2100 and 2400.

No use. engine starts vibrating 20 min in and gets worse.

I thought I was doing something wrong but am getting the feeling it may be a bug.. Unless you guys know of something I am missing here?

Yes my flaps are in the closed position and my gear is up.

-Gollum