RE: improved vibration
Yes it is one of the "older ones" but it does have the eccentric mesh adjust for the gears. I am sooo dissapointed because when I first saw the design and the ability to swing scale like props it seemed my wish had come true for a motor that could be burried in the cowl for my scale projects. I had dreams of a B25, Lancaster and of course the Spitfire but no way can I now consider such projects using the RCV engines. Just make doubly sure your firewall is super strong and the area behind suitably re-inforced, good luck.
Just a thought, I wonder what balance factor RCV use with the 120 SP? perhaps we could try a change of factor to try to shift the vibes away from our operating range. This is something I used to do in my distant youth when racing BSA's!! Now you know I am crazy. numancia