Brushed/Brushless motors, speed controls, gear drives Discuss all aspects of brushless motors, brushed motors, speed controls (ESC's), gear drives and propellers in this forum.

Wow, that is a lot of AMPS

Old 11-06-2003, 11:38 PM
Thread Starter
Join Date: Oct 2003
Location: Tucson, AZ,
Posts: 49
Likes: 0
Received 0 Likes on 0 Posts
Default Wow, that is a lot of AMPS

I am looking for a multimeter to measure the amps of my plane and motor. Most of the ones that I have seen only go up to 5 to 10 amps dc. If I have a esc that goes up to 25 amps, how do I measure this? Are we talking the same type of amp? The new fluke 179 can measure 20a for a max of 30 seconds and thats it. What am I missing here? I don't want to blow anything up, including Any help would be appreciated.
Old 11-07-2003, 08:04 AM
Matt Kirsch
My Feedback: (21)
Matt Kirsch's Avatar
Join Date: Jul 2002
Location: Spencerport, NY
Posts: 7,350
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Wow, that is a lot of AMPS

Yep, same Amps. Apparently, the ability to measure large currents for long periods of time is not an often-requested feature, so they leave it out of most meters. It's also a source of a lot of heat buildup, hence the 30-second limit on that Fluke meter. Let it go longer, and the meter could burn up.

To measure high currents, you need a piece of specialized equipment. For electric flight, there are three popular choices:

1. AstroFlight Whattmeter - Invaluable if you're serious about electric flight. Measures Amps, Volts, mAh, and calculates Watts. Tells you "What's" going on with your "Watts."
2. Maxx Products has a similar meter that only measures Volts and Amps.
3. Sears Clamp-on Multimeter.

The Whattmeter's the most accurate, because you place it inline between the battery and ESC.
Old 11-16-2003, 01:28 PM
Join Date: Oct 2003
Location: Grand Rapids, MI
Posts: 36
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Wow, that is a lot of AMPS

I used this meter last night, to see if the ESC was large enough- I burned out my 50amp ESC during the test. = (
"I think" - it went to full throttle and the wing shot across the room. The ESC was really hot. I was at 100watts but didn't note the amps before the mishap. Needless to say I'm a bit afraid to try my 60amp speed control now.

I'm trying to figure out the best way to run twin astro15's (cobalt motors) DD, in a large make that LARGE Cermark Islander.
Which brings up a question, where can I read/learn about series vs parallel wiring of the two motors? What is the difference in the two configurations. I don't want technical because I can't understand it. I want laymans terms.

I was thinking of using 2 8 cell packs connected with a little series adapter I made up.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.