esc cutting out

[ranger306ci]

My GWS 15 amp esc is cutting out on my Compy. It only does it if I go to full throttle. When I first installed it, this did not happen. But, after I did an abrupt landing one day, it started doing this. My esc is also pretty hot after a 6 minute flight.
I am not using the BEC.
I am running 8K PWM.
Auto timing, with an esky 3900kv outrunner.
Also, I noted while flying the other day, I head a "miss" while it is in the air. I am not sure if it is the esc, or my one way bearing going out.
According to darks calculator, I should be fine.
I have went ahead and ordered a 25 amp esc, just in case. I am thinking the esc is bad. But I want to know if it was the rough landing, or it is just being over used.
Ken

[estarter]

Sorry to hear that, I hope the abrupt landing caused no damage to the bird. I have used the GWS 15A esc in the Compy with the AEK 350 motor 9T, the GWS esc has dual BECs and I recall the temperature after 6-8 min flight is very warm, not hot. The only reason I have to ditch this esc is there's factory pre-program soft brake built in which I was not able to take it out without buying the programming card, when I spool down and land, I had to lower the throttle very easy, otherwise the blades will lock and the heli will get twisted and tip over.

[ranger306ci]

The landing was a while ago, and other than the esc acting up, nothing was harmed. I bought the card for the esc.
Last night the auto unit failed, an my motor was spinning without spinning the blades. I can go to 100% without the blades turning. So that tells me that the esc is definitely getting overloaded. Why I am pulling more than 15 amps is beyond me. Everything is set up right, the bird is 400 grams with the battery.
My pith is at max +11. The only thing I can think of is my motor. It states on the specs to use a 25 amp esc. Maybe it needs it, regardless of the load on it.

[Fireant]

Have you tried another battery? it's possible for the ESC to cut out if the battery cannot supply enough current.

[ranger306ci]

No, I have not tried any other batteries yet. If the new esc doesn't fix the problem, I will try that.
I am using 1250 10c CSRC batteries.

[G-MRM]

I would look to the temp of the ESC, Cutting out within the first 2 mins would rule that out but after that it could be thermal shut down... but if when cold you go full throttle as Ant says is it shutting down on low volts ??

[ranger306ci]

I put a new esc in and all my electrical problems went away. Now that the electrical is fixed, I seem to be fighting a "full throttle/full pitch... no liftoff" problem.
The head is fully rebuilt, lubed, washers are in right, But I think there is collective binding somewhere.

[G-MRM]

Ok back to the head.....

with motor un plugged, can you see the blades going from about neg 5 to plus 10 deg pitch? If so, that feathering shaft and or bearings / washes are still faulty.

Martin

[swatson144]

My CP2 head (don't recall if it's you using one on the compy) loads up too bad at med/low HS to not stick. I spray it with silicone and it's a lot better for a few flights. I've been through that head several times and everything is right also. Just don't want to do more than an estimated 2K without sticking. Maybe just try lowering the TC a bunch and see.

Steve

[ranger306ci]

Yea, its a cp2 head.
Weird thing is, it did not stick before. I am running an estimated 2400rpm at full throttle. with losses, call is 2250. I was thinking about lowering the tc and see if it helps.
The compy is grounded right now, waiting on new skids. The stock ones suck, so I ordered walkera 22E ones.
I got it to fly before, it will again. Just takes patience( and fiddling!)

[estarter]

Did you use the stock Compy washers for the feather shaft or the CP2 washers?

The stock Compy washer is smaller, the CP2 washer has bevel on one side and you have to install it with the bevel side face to the bearing.

I had the sticky collective issue when I had the BCP, there's a lot of talks about fixing the problem.

[G-MRM]

Very small thrust bearings needed !!! 8-)

Martin

[ranger306ci]

It is a 100% cp2 head.

[estarter]

Hmm, I don't see any thrust bearings in my CP2 blade grips. Am I missing something?

[ranger306ci]

You don't have the thrust washers!!!!! man, you are lucky to still be alive. There are not any thrust washers. He was saying that you NEED thrust washers.Which, it does. If only I could find some that would fit.

[estarter]

I was pre-occupied with the k2 grips, the k2 does use thrust bearings in the blade grips.

Frankly, I haven't work on the CP2/BCPP lately!

[ranger306ci]

I noticed that the king2 uses thrust bearings. That is so cool. I am trying to figure out how to put them on my cp2 head. Probably a futile excersise, but keeps my mind occupied.

[MAXXED]

I'm running a Phoenix 25 ESC on my HDX-300, which is similar to the Compy.
Before I installed a Park BEC, the Phoenix would get up to 130 degrees F after 10-15 minutes.
After installing the Park BEC, the Phoenix runs at 107-110 degrees no matter how long I fly.
As a side benefit, when the battery pack gets low, the servos still have enough authority to bring it in safely.

[ranger306ci]

I run a seperate bec from my speed controller, also. It was a problem with my esc. I bought a new one, and it works fine!

[G-MRM]

Been lucky so far, only one heli has a BEC, other than the std one that comes with the T rex 600e, Sues little Rona the Corrona, that 70 amp Jeti ESC came fitted with a external BEC so I just used it as is !!

Little over kill for the little heli @ 70 amps !

Martin

[swatson144]

I pretty much run external becs on everything. The CC phoenix speed controllers internal BEC will actually melt the heatshrink on a hot day if you need a external BEC (never miss a beat while doing it). So far the X400 with the S3110s, and the CP2s are power frugal enough an external BEC isn't required. On 3s lipo a linear bec is very marginal.

Steve

[ranger306ci]

I run an external bec myself. It is a switching unit, that I bought for $10. Works pretty good.

[estarter]

I use ParkBEC on my 450 size bird for added insurance.