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Old Mar 24, 2015, 09:10 AM
Registered User
Canada, QC, Montreal
Joined Jan 2006
41 Posts
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EDF surge

I have an HK Mercury Alloy 1600 (8S) EDF, powered by two (2) 4S (65-130amps) 5000 mah batteries in series, controlled by a Turnigy dlux 120a ESC.
I did some bench testing and found the EDF to be surging slightly at full throttle. Any ideas as to what may be the cause?
BTW, didn't have any fashion of measuring RPM nor did I measure any current parameters during the test.
I was more curious about lbs thrust developed than anything else. Any opinions would be appreciated. Thanks in advance for anyone's opinion.
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Old Mar 24, 2015, 09:16 AM
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4stripes's Avatar
Canada, ON, Burlington
Joined Jan 2009
3,797 Posts
Try changing the low voltage cutoff setting on the ESC to do nothing, rather than reduce power. It might be your batteries not maintaining voltage under load (causing the ESC to hit LVC).
Hook up a simple LIPO battery monitor on your balance leads during the run to see what your cell voltage is doing under load.
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Old Mar 24, 2015, 10:20 AM
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turbonut's Avatar
upland CA
Joined Dec 2004
7,895 Posts
Yea sounds like low volts. you need to put a meter on it and read volts under load. Check the esc settings. May be set for wrong cell count
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Old Mar 25, 2015, 06:18 AM
Registered User
Canada, QC, Montreal
Joined Jan 2006
41 Posts
Thanks very much for your opinions. They sound good and will check things tonight. I will follow-up.
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Old Mar 25, 2015, 08:30 AM
Watt me worry?
Madmax1965's Avatar
Florida
Joined Mar 2006
4,270 Posts
Check your lipos as they may not be standing up to demands.
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