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Permalink Reply by Oliver on April 17, 2013 at 10:50pm

Your motors will run approx. 33% faster at full throttle which in itself shouldn't harm them unless maybe if they are really cheapos, and even then you probably won't be running a quad at full throttle anyway. Your throttle stick will be more sensitive so you may want to add expo and/or adjust the throttle curve in your Tx if it has those capabilities. If you fly at the same RPMs and with the same props as you did on 3S the overall efficiency may be affected somewhat, but it probably won't amount to much (but if you use a timer to determine when it's time to land, be conservative until you know how much of the 4S you're using per minute). Check motor temp by feel after a flight (a good habit to get into anyway). I've switched numerous helis and planes back and forth between 2S & 3S and between 3S & 4S and never had a problem (with appropriate BEC of course).   

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Permalink Reply by Scott Berfield on April 18, 2013 at 9:04am

Thanks. About what I figured, but I am still new enough at this stuff that I like to ask first. Guess I'll give it a try. Be interesting to see how it all behaves.

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Permalink Reply by Nick Polanosky on April 29, 2013 at 10:32am

What motors, props, and payload?

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Permalink Reply by The Sun on April 29, 2013 at 12:12pm

If you have large props you will destroy the motors and escs due to your immense amp draw.

If you move to 4s you may want to get smaller props or limit your throttle to be safe.

If you have really good escs you may be fine, but its not really worth the risk of just guessing.


Find out what amperage your motors are specked to, and make sure you do not exceed that rating without healthy tolerance on your escs and even then be careful.

You will likely fly for slightly longer, ( higher voltage less current draw = higher efficiency.)

I have rotated before myself, but you have to be careful.

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