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Old 07-22-2014, 10:02 PM   #1
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Default flyzone p51 mustang esc problem?

Yesterday I brought out my flyzone micro p51 mustang for the first time this year but wasn't able to get it in the air. I fully charged my 2 li-po batteries, and put fresh batteries in the TX. When plugging in the battery everything looked good, tested the control surfaces, when I hit the throttle, it started up, but by midway it was pulsing on/off, then would cutoff after a couple second or 2. Repeated several times did the same thing, tried the other battery, same thing. Thinking both batteries might be bad I put them on a volt meter and the were both reading about 3.9/4.0 which looked like a full charge to me. Connected 1 of the batteries to another motor, and it seemed to have good power. So now I'm assuming something wrong with the esc? Anyone have any ideas on how to get it going again?

Thanks Tom
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Old 07-23-2014, 01:00 AM   #2
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Not being familiar with that plane, I assume from your voltage statement it's a 1 cell battery? Seeing as you havent used it in a while, did you store the batteries fully charged or discharged? Lipos need to be stored at 50% capacity. If not the internal resistance increases, then what you just described happens. You charge them up, without a load the voltage is fine, but when you start flying they suffer from voltage sag and your esc goes into lvc. Get it on the ground and check and voltage is fine. Those tiny single cell batteries are notorious for not lasting long. This is what I suspect is happening, nothing wrong with the esc. As far as working ok in the other plane, is there a lower power demand in that one? This would be easy to verify with a bigger battery where you could plug a volt meter into the balance lead while doing a run up. Not an easy option with a single cell.
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Old 12-27-2015, 05:48 AM   #3
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Im having this problem with my micro corsair. I hope a new battery will fix the problem. Thanks for the input.
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Old 12-27-2015, 08:00 AM   #4
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LiPo improperly stored can go bad in just a few months. They can seem fine but be unable to deliver a useful amount of current for anywhere near as long as when the pack was new.
Also the useful capacity goes down with age. it will go down fast if improperly stored.

Your result is typical of a LiPo that won't deliver current and/or has significantly reduced capacity.

In the future: Store the batteries at 3.7 to 3.8 volts per cell in a cool location. Do not let them "freeze". (below 32F or 0 C is bad for LiPo )

Most modern multi-chemistry capable chargers have a LiPo storage mode That will charge or discharge (some won't discharge to storage level) the pack to the appropriate voltage. The discharge is usually so slow as to be useless (if offered)...so its usually best to discharge in the model to LVC then charge using the storage mode.
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Old 12-27-2015, 03:15 PM   #5
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Originally Posted by fhhuber View Post
LiPo improperly stored can go bad in just a few months. They can seem fine but be unable to deliver a useful amount of current for anywhere near as long as when the pack was new.
Also the useful capacity goes down with age. it will go down fast if improperly stored.

Your result is typical of a LiPo that won't deliver current and/or has significantly reduced capacity.

In the future: Store the batteries at 3.7 to 3.8 volts per cell in a cool location. Do not let them "freeze". (below 32F or 0 C is bad for LiPo )

Most modern multi-chemistry capable chargers have a LiPo storage mode That will charge or discharge (some won't discharge to storage level) the pack to the appropriate voltage. The discharge is usually so slow as to be useless (if offered)...so its usually best to discharge in the model to LVC then charge using the storage mode.
Right on... Thanks
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Old 12-27-2015, 04:11 PM   #6
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With proper care, a LiPo is good for 3 years high demand (average of 75% rated max current each cycle, 80% labeled capacity) plus another 1 to 2 years moderate demand (average of 20% to 30% rated max current 70% capacity) followed by another year of appx 1C 50% capacity demand.

Using full labeled capacity at full rated max current is a good way to destroy a LiPo in 5 cycles.
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Old 12-27-2015, 11:13 PM   #7
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Originally Posted by smallflyer View Post
Yesterday I brought out my flyzone micro p51 mustang for the first time this year but wasn't able to get it in the air. I fully charged my 2 li-po batteries, and put fresh batteries in the TX. When plugging in the battery everything looked good, tested the control surfaces, when I hit the throttle, it started up, but by midway it was pulsing on/off, then would cutoff after a couple second or 2. Repeated several times did the same thing, tried the other battery, same thing. Thinking both batteries might be bad I put them on a volt meter and the were both reading about 3.9/4.0 which looked like a full charge to me. Connected 1 of the batteries to another motor, and it seemed to have good power. So now I'm assuming something wrong with the esc? Anyone have any ideas on how to get it going again?

Thanks Tom
What electronics do you have?

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Old 12-27-2015, 11:23 PM   #8
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Ok so the battery was the problem. Bought a new battery and no longer have the issue.
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Old 12-28-2015, 08:43 AM   #9
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Originally Posted by FoxProGT View Post
Ok so the battery was the problem. Bought a new battery and no longer have the issue.
You will get a lot more cycles out of your battery if you minimise the time they spend fully charged, so charge up just before flying rather than after flying then leaving the battery charged.

Also use a timer and dont fly all the way until the power cuts.
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Old 12-28-2015, 07:34 PM   #10
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Originally Posted by JetPlaneFlyer View Post
You will get a lot more cycles out of your battery if you minimise the time they spend fully charged, so charge up just before flying rather than after flying then leaving the battery charged.

Also use a timer and dont fly all the way until the power cuts.
ok good notes...Thanks
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Old 12-28-2015, 08:21 PM   #11
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These are very nice for monitoring the single cell batteries.
There are better models but some can certainly be had for cheap.
http://www.harborfreight.com/7-funct...ter-90899.html

I don't have a short temper. I just have a quick reaction to B.S.
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