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Jan 16, 2008, 11:18 AM
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With a 12 tooth pinion, 3S LIthium battery and your Mega motor (2200KV) you will have a head speed around 1500 RPM ...

This is really low for a T-Rex 450 ... should be around 2300 RPM to 2800 RPM

By the way, the 430XL motor is 3700KV ... with this motor and same pinion and battery you should have 2600 RPM. You will also have more power with the 430XL.

Here some links that will help you calculate head speed and selecting the right motor pinion.

http://www.e-helis.com/helicalc.php
http://www.helitown.com/Downloadpage...headspeed.html

Regards

Kos


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