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Blade Helicopters (eFlite) Blade Helicopters (eFlite) CP, CX, mCX CX II, CX III. and others |
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04-08-2015, 01:06 AM | #1 (permalink) |
Registered Users
Join Date: Oct 2014
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constant LVC MCPX
My MCPX seems to pulse in and out of low voltage cutoff as soon as I raise the collective above what is required to hover. I have a new motor and new batteries. It could be the board but they cost so much to replace its not worth it for this old heli. Any advice? See video below:
https://www.youtube.com/watch?v=1oIzyyuJZqM
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T-Rex 450L SK720/GPS 180 CFX ZMR250 Taranis |
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04-08-2015, 01:20 AM | #2 (permalink) |
Registered Users
Join Date: Feb 2013
Location: Fargo ND (Home of the NDSU Thundering Herd)
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If the board is a brand new V2, I've had the same problem...
Just needs a little break-in time and all will be well A small drop of light syn oil to the main shaft bearings may help |
04-08-2015, 01:24 AM | #3 (permalink) |
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Thread Starter
Join Date: Oct 2014
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Thanks but its not a new board, this is an old heli and this problem just started. I could try oiling
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T-Rex 450L SK720/GPS 180 CFX ZMR250 Taranis |
04-08-2015, 01:25 AM | #4 (permalink) |
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Join Date: Feb 2013
Location: Fargo ND (Home of the NDSU Thundering Herd)
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Carefully check the power cable, from the board contacts down to the connector pins...they will often crack or fray if they've come into contact with the servo gear or main gear
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04-08-2015, 07:57 AM | #5 (permalink) |
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Join Date: Jun 2011
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I had to re-solder my battery connector one time.
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04-08-2015, 09:23 AM | #6 (permalink) |
Registered Users
Thread Starter
Join Date: Oct 2014
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Thanks for all the suggestions. I resoldered the battery cable and checked the connections and oiled up the bearings and swashplate. No difference. Sometimes the pulsing happens before the blades are even spinning but other times I can hover the helicopter for minutes with no issues. However I definitely get power cutouts if I try any big collective inputs.
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T-Rex 450L SK720/GPS 180 CFX ZMR250 Taranis |
04-08-2015, 10:36 AM | #7 (permalink) |
Registered Users
Join Date: Apr 2011
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Are your batteries new and warm? I agree with the culprit likely being the helicopter, but battery performance does drop off rapidly at cooler temperatures. As far as battery aging, most don't have a lot of extra over what the mCPx needs, even when new.
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04-08-2015, 10:38 AM | #8 (permalink) |
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Thread Starter
Join Date: Oct 2014
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The batteries aren't new so I could try a new one but the ones I have are warm I'm flying inside. Even with other batteries I have had though when they get old the hell just gets weak and unable to fly almost but there is no pulsing
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T-Rex 450L SK720/GPS 180 CFX ZMR250 Taranis |
04-17-2015, 10:27 AM | #9 (permalink) |
Registered Users
Join Date: Aug 2010
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Might you have a short in the tail? So that when you throttle up, the tail draws more amps and then starts to short and causes you to get LVC?
Try remove the tail and just tape it down or something while you spin it up, see if it still LVCs
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NanoCPx - Astroid Designs "mild" BL-kit mCPx "lightweight"-BL - BLHeli 4.0, XP3a dbl-fet/C05m 8T mCPx "super"-DualBL - BLHeli 4.1, XP7a(3xFET)/HP06v2/8T, XP3a/HP03t,3xSPMSA2030L 2.3g servos 200QX - Bone Stock |
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