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HomeAircraftHelicopterMain Discussion › Need help troubleshooting
11-15-2014 11:07 PM  3 years agoPost 1
erikb

rrNovice

atlanta ga

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I was flying my new to me Raptor 550e today and the voltage started at 4.20 I have my alarm set for 3.80 after a minute of flight the voltage alarm went off..I changed voltage alarm to go off at 3.5 volts . Alarm did not go off again but 3 minutes into flight motor quit for about a second I autoed from about 9 feet just before I was on ground it started again. Maybe only dropped a few feet battery was at 3.85 and scared I packet it up but 5 minutes later it was at 4.10..Electric is new to me so im not sure if voltage drop is normal..engine stopping sure isnt Now I don't know if it is the battery Pretty sure it is or if should I suspect the motor or esc. I really really don't wanna crash this bird it flies like it has autohover

any sugestions I think I will trash the battery and try again but I don't wanna through away a battery if this is normal.. Thanks again

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11-16-2014 01:16 AM  3 years agoPost 2
nappyroots2182

rrElite Veteran

Moline, il

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battery should not drop that fast that quick. the motor cutting out is telling u that. is the battery new? sounds like u need a new battery to me

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11-16-2014 01:28 AM  3 years agoPost 3
erikb

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atlanta ga

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No I bought helicopter and battery used..I also suspect battery.......and have another one...just wanted to know if this sounded like it could be motor or esc..thanks

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11-16-2014 02:49 AM  3 years agoPost 4
kingmeow

rrApprentice

The Garden State, US

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I bet it's the battery. I got a used Protos with a used battery pack. When it was ready to maiden, it lasted a whole 45 seconds and LVC brings the heli down gently. What???? When I got home I measured the pack and cells were like 4.10V each. No where near depletion.

My theory was that it was a bad battery. Perhaps high IR and what not even though the pack look new'ish from the outside. Got a new pack to try and now I can get 4.5 minutes on a flight.

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11-16-2014 03:01 AM  3 years agoPost 5
rpat

rrElite Veteran

Weirton, W. Va.

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I think tht your battery is shot. If you have another one try it. I can just about guarantee that the battery is shot.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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11-16-2014 04:14 AM  3 years agoPost 6
turboomni

rrProfessor

East of the Equator

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If its discharged see how many mah are put in to fully charge it . That will give you a clue.

Setup is everything, All my heli's can fly far better than I can pilot them

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11-16-2014 04:31 AM  3 years agoPost 7
EEngineer

rrProfessor

TX

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Yeah, test it by cycling it on the charger.

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11-16-2014 11:26 AM  3 years agoPost 8
rpat

rrElite Veteran

Weirton, W. Va.

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What the OP described is exactly how a depleted lipo reacts to a load put upon it. All is good for about 30 seconds and then the bat. hits it's death wall, and has no more to give, regardless of what the volt meter says.

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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11-16-2014 01:08 PM  3 years agoPost 9
nappyroots2182

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Moline, il

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u can have a bad battery but it still charge fine. the internal resistance is what makes the battery drop voltage so fast once u run up the motor

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11-16-2014 01:42 PM  3 years agoPost 10
erikb

rrNovice

atlanta ga

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I cycled it with charger all seemed ok....i think it just can't take the big load...after sitting all night battery went from 3.85 back to 4.10 volts...glad I had a volt alarm...

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11-16-2014 01:43 PM  3 years agoPost 11
erikb

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atlanta ga

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Thanks for all the help

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11-16-2014 02:26 PM  3 years agoPost 12
Pistol Pete

rrProfessor

Seffner, FL

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Motor should not quit but spool down slowly when batts are low to avoid what you described. Post your ESC settings. Sounds like a hard vs soft cut off.

3.8v cut off is to hight as you discovered.

3.5V is best as you got four minutes. Not bad given we dont know your head speed nor battery size/capacity. We can assume between 500-600mA per minute for a total of 2000-2400mA.

Being new to electrics, are you aware of the Lipo 80% usage rule of thumb?

Ie: Using the 2000mA above and the 80% rule, we can assume your batt has a capacity 3600mA.

~~Enjoying the hobby one flight at a time~~

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