Many of us live in areas that have fields with restricted noise issues, so we try to keep the noise down as best we can.

One thing that I keep preaching is that noise does not equate to power. Revving the engines beyond their actual power band does nothing but make more noise and can actually damage engines. The RPM range that engine manufacturers show does not reflect reality. For instance the OS 46 AX specs state 1.6ps @ 16,000 rpm. Yeah, sure.. Ok. try that some time and see how long your AX lasts.

A more practical RPM max goal is about 12,000 RPM. So, if you manage to find a prop that will give you good performance, good acceleration, and good power at 12,000 RPM and gives you the noise you want, then go for it.

But, you will find that the smaller props won't make the kind of realism noises you desire. The sound is there, however, the sound level becomes attenuated by the exhause note. A quieter muffer will give you more prop noise, to a limit. The only real way is to get a larger prop and spin it, but you won't have the power to spin a very large prop with your smaller engine.

If you want that realism, get a large four stroke with a large prop.. of couse, that means a larger plane too.

CGr.