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Electric Setup Check for Noob - 6/23/2009 10:24 PM   
gaatr


 

Posts: 18
Joined: 4/30/2009
Last Login: 6/23/2009
From: , TX, USA
Status: offline 		Here is the setup - I am a Noob to Electrics but after reading, reading reading I am geting the hang of it.

770RPM/V Brushless Outrunner from RC smart (38A max, 20V Max, 420 watt @ 11.1V) recommended prop 12x7 - 14x8
80 AMP ESC - RC Smart (6-30V, 80A continuous, Max 90A/12s)
4S1P 20C 2200maH 14.8V Zippy Flightmax Lipo

I am currently running a 12x6 Electric APC prop and through my Wattmeter I am pulling 43 Amps at full throttle - with a 12x8 I am pulling over 50 A...!!

I flew three flights with the 12x6 and after the flight, the motor esc and battery were quite cool to the touch - warm maybe, but by no means HOT..!! although I never really flew full throttle but only for 10-20 seconds at a time.

Will I be ok with this setup - Thanks in advance for all your help...!! These forums have helped me learn alot very quickly.

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RE: Electric Setup Check for Noob - 6/23/2009 11:38 PM   
lejongleur


 

Posts: 244
Joined: 2/25/2008
Last Login: 10/20/2009
From: Norwalk, CT, USA
Status: offline 		As you are using a 4S pack, at 43 amps you are over 600 watts, which may not be so cool with your motor for long. When they quote max power for a 3S pack, they still probably mean that you can only safely run the same power with a 4S pack, i.e. less current.

Bear in mind two things:

1. If you do not fly at full throttle, you are not at 600 watts, and may get away with it.
2) Within a very short space of time, your battery voltage will drop, and your power dissipation will drop as the square of the voltage, so you will soon be more like 500 watts and less than 40A.

My suggestion would be to either set the high end point for the throttle at 90-95%, or switch to a smaller prop, like and 11x7 or 11x5.5.

On the other hand what do I know? You can probably get away with what you have, as long as you don't run at full throttle for a minute at a time. Hope this helps...Chris

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