Servo current is difficult to quantify since it is "pulsed" via the servo frame rate
and is variable with stick movement.
On my HLG with a 555 and two HS-55's, I am getting an average battery working life of
some 140 minutes under these conditions: this is the "life" of a full charge over 3-4
flying sessions, and is the average 4 charges. The "endpoint" is set at a battery
voltage of 4.5 volts. The battery is a four cell, 150mAh nicad. An Accucycle gives
the capacity at close to 150mAh on a 250mA current draw cycle.
So this gives 150 mAh divided by 2.33 hours, or an average current draw of 64.4 mA.
Minus your current draw of the Rx, this gives 53.0 for tow servos, or an average of
26.5 mA per servo.
FWIW, YMMV.
--Bill
On Mon, 11 Dec 2000 17:25:47 -0500 "Walba, Rick" [EMAIL PROTECTED] wrote:
OK, at Jon's behest, I have done a more thorough test. For 2 HS50 servos and
a Hitec 555 rx, current measured at idle:
[EMAIL PROTECTED]
[EMAIL PROTECTED]
30.0ma@6v
This slight reduction in drain at lower voltage actually coincides with what
Don Stackhouse mentioned to me. The reciever alone drew a steady 11.4ma
throughout this range.
My equiptment isn't really set up for instantaneous readout, but gentle
jiggling of the sticks drew around 100ma. I feel that 45-150ma is probably
the range of what these servos draw when we are making small corrections. A
sharp rudder elevator input showed spikes of as much as 1.79amps, but the
actual figure is probably higher.
Rick
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