Nitro - a slippery slope indeed!!!!!

[LeftyAl 164]

thanks for the info, much appreciated.

[WillyChang 1814]

Nitro engine's exhaust is a tuned system... the tuning in question is getting the back pressure pulse timed right to help suck out the burnt charge... and is adjustable by the total length (easy to change) &/or shape/size/length of the expansion chamber (slightly harder to adjust).