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5955 vs 5945 current drain

Old 07-27-2005, 10:59 AM
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Default 5955 vs 5945 current drain

Is it possible to give me a practical "guess" in the comparison of 5 5955's to 5 5945's in a 50 cc airplane concerning the current draw. Lets say I run a 2400 battery and I get 6 15 minute flights on the 5945's. How many could I expect to get from the 5955's and is the current draw at idle substantially more?

Yes I know that the 5955's are an overkill but at some point I may move up to a larger plane

Thanks
Old 07-27-2005, 01:25 PM
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Default RE: 5955 vs 5945 current drain

The 5955 have the potential to draw about 1 amp more current than the 5945's. However if the work required to operate the surface is unchanged as compared to the 5945 you'll not likely not an appreciable increase in current demands.

That said you might use up one flight with the larger servos...
Old 05-06-2006, 08:11 PM
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Default RE: 5955 vs 5945 current drain

Measured the current drain on 5955TG and 5945s installed on my WH Edge 540 today. Setup: one 5-cell 1500ma nicad test battery, dual 5945s for elevators and ailerons, single 5955 for the rudder, and Futaba receiver. The plane stayed on ground.

Current drawn:

All control surfaces are neutral: 30ma
elevator or ailerons only movement: up to 500ma
rudder only movement: up to 900ma
All control surfaces are active: up to 2A

Based on the numbers, I would think a battery of 2400mah should have sufficient capacity to handle 1 hour of IMAC style flying, with enough reserve.

I also found that putting the rudder at high (3D) rate does not necessarily increase the current consumption. It is still about 900ma.

--qc
Old 05-06-2006, 08:23 PM
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Default RE: 5955 vs 5945 current drain

Thanks nonstoprc , except for the RX that's what I have in my Staudacher with two 5 cell 1500s so now I know about what they pull.[8D]
Old 05-06-2006, 11:14 PM
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Default RE: 5955 vs 5945 current drain

The dilemma were faced with is relevant to flight loads imposed in active flight conditions. That said typical average flight loads for a 35% model with high power digitals are approximately 22mA per minute.

1500mAh x 2 = 3000mAh. It’s safe to factor approximately 50% of the rated battery capacity with reasonable expectations to realize sustained voltage and amperage.

3000mA x 50% = 1500mA

1500mA / 22mAm = 68mAm, so 1 hour is a reasonable expectation, however it would be prudent to load test the batteries after every flight to insure the batteries are up to the task. A load test would involve an expanded scale volt meter that provides the battery with a 1.5Amp load, you should be able to sustain at the very least 5.9V. There is some cushion built into the numbers I prefaced above, keeping in mind battery voltage under load is a poor factor for determining battery capacity...
Old 05-07-2006, 09:01 AM
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Default RE: 5955 vs 5945 current drain

[8D][8D]

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