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02-03-2011 | 06:29 AM

#34

Moerig

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From: , NAMIBIA

RE: Electrical power source requirements for our jets

Quote:

ORIGINAL: David Gladwin

Plumb's assertations about powerful servos does not seem to be true. I tested a range of JR servos from 537s through to 6301 (33kg/cm) and 6311HVs (36.5 kg/cm at 7.4 v) all at 6v and all drew currents of around .12 amps with a 1 kilo load at 1.5cm arm EXCEPT the MP80T which is a powerful, 25kg/cm, brushless servo which drew significantly less current , around.05 amps than all other brushed servos, digital and analogue. In summary it seems correct to say that current draw is a function of torque actually being delivered rather than the torque a servo is capable of producing, certainly in the lower torque ranges.

Regards,

David.

Those numbers are fundamentally wrong. Servos draw very short sharp current spikes, something most DVM's cannot cope with, hence the faulty data.
A 25Kg servo drawing less current than a modern RX (50mA!), come on now, that's just not cricket old chap...

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