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Old Oct 12, 2012, 04:49 AM
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Hastings, New Zealand
Joined Jan 2001
5,217 Posts
Originally Posted by flylowfast View Post
I measured it by suspending it downwards from a scale and got these results:
-GWS EP-5030: 54.2g... 1.72Ap, 13.3Wp, 7.72Vm
Compare this to ssatoru's test data in the thread New 5 gram outrunner/ unitedhobbies HXM1400-2000,
Motor #1
GWS 5x3 CL400 2S 7.63V 1.91A 14.00W 9,390rpm
Extrapolating from my own tests of the EP5030, Motocalc predicts 73g static thrust at 9400rpm. 54.2g corresponds to about 8100rpm.

Either your motor is running significantly slower then it should, or your thrust measurement is inaccurate (perhaps a little of both?).

Motocalc In-flight Analysis
Sea Level, 101.3kPa, 20C

Motor: HXM1400-2000 (ssatoru); 2020rpm/V; 0.35A no-load; 1.55 Ohms.
Battery: Test Lipo (100C); 2 cells; 10000mAh @ 3.82V; 0 Ohms/cell.
Speed Control: Castle Creations Phoenix 10 (cc); 0.013 Ohms; High rate.
Drive System: GWS EP5030 (ba); 5x3 (Pconst=1.23; Tconst=1) direct drive.
Airframe:  None.

AirSpd  Batt Motor Motor  Input   Loss MGbOut MotGb   Prop Thrust
 (m/s)  Amps  Amps Volts    (W)    (W)    (W) Ef(%)    RPM    (g)

   0.0  1.91  1.91  7.61   14.5   7.27   7.24  49.9   9390   72.8
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