Originally Posted by flylowfast
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
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, 20°C
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.
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