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Old 03-08-2011 | 08:06 AM
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plankdriver
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From: , OH
Default RE: helicopter engine in a plane?
Like the guys said, The heli engines are run @ pretty high RPM normally with 30% nitro AND TEHIR MUFFLERS are tunned to the high RPM

The 50s run in the 17K to 19K range, (no more) and 91 around 14.5K and 16K.

Be carefull with some of the older OS 90s, they dont like to be above 15K and anywhere near lean.
In a helicopter, All these engines run very rich because of the crappy cooling a helicopter provides, so the mixture with a prop will be leaner but dont get carried away.

Santiago
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