Gentlemen.
Freakingfast has made, for me that is, a very interesting post concerning mufflers:
http://www.rcuniverse.com/forum/m_50...tm.htm#8415069
ORIGINAL: freakingfast
ORIGINAL: orstraycat
OS .55 inverted. I am running 15% Omega fuel and a APC 13 x 4W prop, OS A3 plug on a U-Can-Do getting 11,600 rpm at 2200' ASL. Stock Power Box with baffle removed.
If you drop down to a 12.25X3.75 and replace the baffle you will have about the same power, however the transition will be smooth and linear. Removing the baffle will gain between 600 to 1000 rpm depending on your prop load, but there will an annoying flat spot in the mid range. No big deal if you want speed, but it’s no fun if you want to hover.
Most aftermarket mufflers, tuned mufflers and pipes will give the engine more top end power at the cost of smooth transition that many 3D/ stunt fliers crave. As far as I know, only the Macs “Quiet Pipe” has close to a smooth transition and power gain.
I was not aware, that a simple baffle could make an engine runs differently. All I have learned until now, was perhaps a lower tank pressure and perhaps an increase in the top RPM.
Things that make U go "hmmm"
