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GWS P-51 gear ratio

Old 08-18-2003, 11:31 PM
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Default GWS P-51 gear ratio

Does anybody know what the gear ratio is on the EPS-300C gearbox that ships with the P-51? I notice that there are several different gear ratio replacement motors that you can get for this plane, but I can't find what the original ratio is.

Old 08-19-2003, 11:00 AM
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Default GWS P-51 gear ratio

Look at the spur gear (the big one). There should be a letter embossed on the face of the gear. That's the ratio of the gearbox. You can look it up at

If all else fails, count the number of teeth on the pinion (little gear) and the spur, then divide the spur number by the pinion number.

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