Good point. I was just concentrated around internal combustion engines that were the original question. Actually, I had the opportunity to build the Abbra in electric version for a friend. We installed a soft mount in the electric version also. Yes, it sound crazy but the prop also generates vibration. It is a lot less vibration so the mount has less rubber. The weight of the electric version is 10 lbs 6 oz. Therefore, we have now a good reference for three different propulsion systems in the same model. The glow version was a couple of oz below 10 lbs. Besides the vibration and noise levels, the big advantage of the electric version is that the take off and landing weight are the same.

Best regards,

Vicente "Vince" Bortone