RunRyder - How do I find the Motor Amperage Draw

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e-Electric Motors & Controllers > How do I find the Motor Amperage Draw

NFFD
Senior Heliman
Location: B.C. , Canada

This might be a silly question, but how to figure out what the motor draws for amps on a single flight?

any input is appreciated

Cheers

Curtis

Sorry Sir!, But Visa's saying We need to destroy the Card!!

08-09-2008 04:39 AM

Heli 770
Elite Veteran
Location: Lemon Grove, Ca. USA.

NFFD
When you charge your batt. pack after a flight. The amount you put back in the pack is the amps. used for the flight.

08-09-2008 04:55 AM

stanc
Veteran
Location: Conroe, TX

Get an Eagle Tree Flight Data Recorder.

http://www.eagletreesystems.com/

Stan
2 x Ion X2
eStartus
eAvro90
Performance Plus Lipo Packs

08-09-2008 05:07 AM

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Quote
When you charge your batt. pack after a flight. The amount you put back in the pack is the amps. used for the flight.

Close, but not quite...

When you charge the battery after flying, note the number of amp-hours needed to fully charge the battery. Multiply that number by 60 (to get amp-minutes) and divide by the length of your flight in minutes. The result is the average amps drawn during your flight.

To get peak info (rather than average), buy an EagleTree recorder like Stan said. (Or one of the other in flight recorders that have come out since, but so far as I know, EagleTree is the original.)

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

08-09-2008 07:27 AM

NFFD
Senior Heliman
Location: B.C. , Canada

Rob_T

Do I multiply both the amps, and the hours by 60 or just the hours?
and divide flight minutes into both again, or just the minutes.

If you could do an example that would be greatly appreciated.

Curtis

Sorry Sir!, But Visa's saying We need to destroy the Card!!

08-09-2008 09:13 PM

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Example time :D

Suppose I go fly my Trex 450XL for 10 and a half minutes (10.5 minutes). When I get home and charge the battery the charger reads 1750mah (1.75Ah) charged.

I multiply the charge amount (1.75) by 60 and get 105.

I take that number (105) and divide by the flight time (10.5) and get 10. So on average my Trex draws 10A - which I also know from flying with a recorder is about right.

(By the way, my Trex setup is quite mild and the actual current draw is a little less than the numbers I used above - most peoples Trex's draw quite a bit more!)

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

08-10-2008 07:17 AM

NFFD
Senior Heliman
Location: B.C. , Canada

Thanks so much, that clarifies alot

I appreciate the help, and the time

curtis

Sorry Sir!, But Visa's saying We need to destroy the Card!!

08-10-2008 09:22 AM

red_z06
Elite Veteran
Location: Dumont, NJ

You can go with the hitech method of eagletree or lowtech(relatively) method with inline watt meter like Whatts up meter.

http://www.powerwerx.com/product.asp?ProdID=3809

This meter with a dean connectors double as a voltmeter to quickly check if the pack is charged or not.

For test setup, you just plug the device between batt and esc and view the power, avg amp draw, max amp draw etc. The only drawback is it will not store data.

Here is a quick chart for easy reference

4min flight (100% discharge) = 15c avg discharge
6min flight = 10c avg discharge
10min flight = 6c avg discharge
60min flight = 1c avg discharge

Just remember your peak can be as much as 2-3 times the average.
Also, for 80% discharge, devide above c number by 0.8

www.justinchi.com

08-10-2008 01:26 PM

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e-Electric Motors & Controllers > How do I find the Motor Amperage Draw

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