RCU Forums - View Single Post - Looking for a decent engine

06-06-2005 | 12:12 PM

#44

Flyboy Dave

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From: Pinon Hills, CA

RE: Looking for a decent engine

Here's some info from the MAS site....

C. RPM Operating Limits -
One of the differences between wood and glass-filled nylon propellers is that glass-filled nylon props have suggested RPM limits for mechanical considerations. This will vary according to diameter. For Master Airscrew props, we suggest the following formula: RPM Operating Limit = 160,000 divided by Diameter in inches. In our .40 size engine example, a 10" diameter g/f nylon prop has an operating limit of 16,000 rpm, well above the requirement of a .40 engine.
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The safe operating rpm for a 9" prop would be 17,777 RPM's, therefore it would NOT
be suited for racing engines in any case.

Flyboy Dave.

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