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I experienced what seemed to be severe vibration, on my SIG Kadet Senior, while the engine was running at low RPMs (2500). So I decided to get a prop balancer. The engine (OS .46 LA) is brand new, and has been broken in. I believe that I managed to fine tune it as well. It has a Max RPM of 11,500 and an idle at 2500 - 2750.

I checked over everything such as mount to firewall and engine to mount... they are all snug as a bug.

Unless the vibration I mentioned is normal, than I assumed the prop is out of balance.

The Senior has a large Air Frame, and the covering is wicked resonant. Mabey the vibrations I was seeing was normal?

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Hi.... I had an OS .46LA a couple years back and it vibrated quite a bit on low rpms also. I read somewhere that is just natural for the LA series. All my AX, FX, FXi OS motors all ran smooth with the same prop as I had on the LA. Still, balancing all props is a good idea regardless!!

Curt