rc-sport,

I have a Roto35vi and a bambula 20X8 at 6600 on 93 octane 50:1 using Motul 800 and see very similiar results at 93dB. The muffler is the Supersonic from RCShowcase.

My OS91FS is probably the quietest thing I have ever heard at 84dB and my YS110 is louder than both at 96dB. The only thing gas I have heard that is almost as quiet as the Roto is the Zenoah G26 conversion from RCIGN1 and the slimline pitts at 95dB turning a Mejlik 18X6

Just out of curiosity, what rpm are you getting with that 3 blade Mejlik with what gas/oil mix. I'm considering one for my Cap232 to get the "look" plus keep the pull I need.