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Old Jan 11, 2012, 09:45 PM
fooyukvoon is offline
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The Need4Speed
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Discussion

Can different Brands of ESCs give different results on similar settings?


Hi everyone,

New to this section of RCGroups. I m having a bit of a confusing problem with a few of my ESCs. In a few of my setups, I noticed big differences in Watts with different ESCs. For example, in my latest setup...
Sapac 4000kv Outrunner, 4S, 2200mah 25C, Hobbyking SS 60A ESC - 533W peak

With a Turnigy 100A DLux ESC - 687W

Nothing changed other than the ESCs. The Turnigy is on auto detect mode.

The Hobbyking SS was tested thru all setting, just could not get the same figures as the Turnigy.

Can a Hobbywing Programming Card be used to program a HobbyKing SS Series ESC?

How do we reset the ESC to autodetect mode? (the online manual from HobbyKing does not show)

Lipo was fully recharged every test.

Thanks.

Foo
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Old Jan 12, 2012, 09:08 AM
hoppy is offline
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Quote:
Can a Hobbywing Programming Card be used to program a HobbyKing SS Series ESC?
I just plug it in and see what happens. Some do, some don't. I would doubt seriously if the SS will work with that. You can set the battery type and brake - that's all.

Different ESC's, different results? In my experience, yes. You can say the same thing.
Last edited by hoppy; Jan 12, 2012 at 09:13 AM.
Old Jan 12, 2012, 01:53 PM
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They should theoretically give similar maximum output. However, differences in motor timing, throttle calibration / curve interaction with the TX, and size of wires / connectors could make a difference. I assume the 100A comes with bigger wires, which pass more current without heating up (which increases resistance).

Don't think the HW / Turnigy programming card will work with the SS controllers.
Old Jan 12, 2012, 08:47 PM
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While the basic circuits are pretty much the same for different ESCs, the software is a different story. When the ESC is set for 10 degrees of timing is it really 10 degrees? Does the ESC output the same waveforms that are shown in the text books? If you think so you have much more faith in programmers then I do. In any case there are other software problems such as interrupt latency that programmers have to work around that means what you get may not be what you think it is.
Old Jan 12, 2012, 09:13 PM
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The Need4Speed
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Latest test on a setup I plan to put into the Hobbyking X-83, the figures I get :-


Sapac 4000kv Outrunner, 2650mah 40C 3S, 64mm EDF, Same Tx,Rx

Turnigy Plush 60A - AutoSetting - 687W
HobbyKing Birdie 60A - 533W
Hobbyking SS 60A - 505W

All on the same Lipo pack (Fully Balanced Charged before each test)

Found out only possible to program the HobbyKing SS/Birdie ESCs with Tx/Rx.

I am suspecting the ESC software or FET.

Foo
Old Jan 12, 2012, 09:30 PM
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Yes


Because there are different designs, components, tolerances, electronic chips & various suppliers still using people to control the quality.

How can we build it cheaper ???
The most important goal of all long lived companies.
All those cause constant changes in a product. By accident or design.
Most ARE DOING the best that they can.
Old Jan 13, 2012, 05:49 AM
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Foo, IMHO reading more watts doesn't necessarily mean more power. It most likely is the cheaper means of parts and assembly on the ESC(resistance). You have two ESC's that are close on the readings and one not. Try the thrust test on a scale nose down and see which one does the best. Performance and efficiency don't always go hand in hand.
Old Jan 13, 2012, 06:55 AM
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Ok, will try to get thrust figures of all 3 ESCs n post my findings.

Foo
Old Jan 13, 2012, 08:28 PM
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Simpler to just measure the rpm with a tach.
Same prop, more rpm, more thrust......and, more accurate.
Old Jan 14, 2012, 12:58 AM
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I will second Hoppy on the RPM measurement.
Easiest of all tests (Using same prop, of course)
Old Jan 14, 2012, 08:00 PM
fooyukvoon is offline
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Now that would b a big problem. Can't think of where to find or buy a tachometer here. Have to search Hobbyking for it.

Foo


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