HELP !!!! - Throttle down but Blade Still Spining until batt

[acurusaragon]

Dear All,

This is my story and hope somebody could assist me in figuring out the problem.

i. I was doing a normal flight (F8 and hovering) for a bout 4 minutes or so .....
ii. Landed and ...Check the Esc and the Battery ... quite warm
iii. Thinking its still ok
iv. Continued to Do some normal Forward flight and F8 for a minute or so AND

Suddenly ....

i. It sounded like the head speed is decreasing without me doing anything to the throttle stick
ii. The Bird started decended to the ground ..... manage to control and land it safely
iii. I Pull down the throttle to 0 deg. BUT !!!! the blade/head was still spining .....
iv. Panic ..... I try to flip the throttle hold switch on my TX (with a hope that it will stop) .... but it continued spining
v. Hopless ... just look at the bird until the blade no longer spin
vi. Check the battery .... BLOATED and HOT!!! (this is a 1 week old battery )
vii. ESC was also hot ....

So now i'm confuse ... What is the Problem ...

My motor : AON Motor
My ESC : Quark 33A
My TX : JR 9X 2
Bird : Dragonous Pro

[daijoubu]

Sounds like your ESC is toast. Check the wiring from your rx to your ESC. Is everything plugged in? Correctly? Can you control a servo from the channel on your ESC? If so, the rx is probably good. Can you control the motor speed with the ESC? (remove the motor from the heli first!)

[Coolice]

Hey,

What kind of throttle curves were you flying, eg. throttle percentages and did you use govenor mode?

I have not heard of this typoe of problem before running a Quark and so we need to look at how is was being used to determine what went wrong.

I am using one of the V2 Quark 33's in my Dragonus Elite and it runs very well.
.

[acurusaragon]

Hey,

What kind of throttle curves were you flying, eg. throttle percentages and did you use govenor mode?

I have not heard of this typoe of problem before running a Quark and so we need to look at how is was being used to determine what went wrong.

I am using one of the V2 Quark 33's in my Dragonus Elite and it runs very well.
.

Coolice, thanks ....

these are my setting on my JR9X2 ..

Throttle Curve :

PL : 0%, P1: 33%, P2: 55.5%, P3: 71.5%, P4: 83.5%, P5: 93.5%, PH: 98%

Is there a possibility that I wrongly setup my ESC ? ....
Or is there a problem with my TX ...( :arggg: ) .... GLITCH maybe?

[acurusaragon]

Sounds like your ESC is toast. Check the wiring from your rx to your ESC. Is everything plugged in? Correctly? Can you control a servo from the channel on your ESC? If so, the rx is probably good. Can you control the motor speed with the ESC? (remove the motor from the heli first!)

Daijoubu,

That was my second flight with this esc..
I remove the pinion from the motor and try it again today ..... throttle up and down ... sounded and looks ok ... but no test flight yet ...
Will try again on the field 2morrow... hopefully it will not puffed another of my battery ...

[Coolice]

Hey,

Looking at the throttle percentages I am inclined to think the ESC may have got a little hotter than it should have been.
With electrics it is essential to run at almost full power all the time, if you run low throttle percentages for extended periods the ESC has to absorb the extra power from the LiPo and in doing so generates heat. This heat is the single biggest killer of ESC's.
Another possability is the internal BEC may have shut down due to the heat and stopped you switching off the motor.

Before you try again reset your throttle curves a little for me, on my Dragonus & Century Swift (the Swift runs a CC60) I have set the 5 point throttle curves as follows (JR10X ~ Swift) :

Normal mode :
0 low stick
46% power @ point 16
78% power @ point 32
80% power @ mid stick then a straight line
all the way up to full stick @ 80%

IdleUp 1 :
Straight line across @ 90% power

IdelUp 2 :
Low stick 96%
Mid stick (0 pitch) 90%
High stick 96%

Dragonus Quark, non govenor mode (JR 9XII, 7 point throttle curve)

Normal mode :
L : 0%
1 : 41.5%
2 : 74%
3 : 80%
4 : INH
5 : INH
H : 100%

IdelUp 1 :
L : 78%
1 : INH
2 : INH
3 : 88%
4 : INH
5 : INH
H : 100%

IdelUp 2 :
L : 100%
1 : INH
2 : INH
3 : 90%
4 : INH
5 : INH
H : 100%

As you can see my throttle curves rise very steeply in Normal Mode to bring the motor and ESC into the power area where it is running most efficiently, then the collective does all the work for height control.

Try similar settings to reduce the amount of excess power the ESC has to dissipate to control the head speed. If the rotor speed is to high/low then you need to change the motor pinion to suit.
.

[acurusaragon]

Coolice .. Thanks ...

Will try the setting ... and see how it goes..

[acurusaragon]

Coolie, ... I try the Throttle curve setting as you mentioned ....

But after about 2 minutes flying and bring down the bird...... it happen again ...

the bird already on the ground but the blade keep on spining... its only stop after a minute or so ... damage : my 2nd battery bloated ...:(

I suspect the ESC ... is there any way to reprogram teh ESC again... maybe I set the minimum/maximum throttle range wrongly ....no?

[Coolice]

Hey,

Oh cr@p! What is stumping me here is the fact you are only flying for 2 minutes. the motor still powers ofr a little longer after landing but the LiPo still puffs.
WHat MAH are you LiPo's just so I know?

Did you feel any excess heat anywhere in either the ESC or motor? The battery I am guessing did get hot to puff, correct did it feel hot?
Obviously just be careful being near puffed LiPo's ok.

Two ideas :

1. Quark is playing around and needs to be repaired. You can reprogram the settings but as you have already damaged two LiPo's is it worth the risk without getting the ESC looked over properly.

2. Is there a short somewhere in the system, is the motor shorting out inside which inturn heats the Quark up, which inturn stops it from working properly?

How new is the Quark, eg. could you take it back under warrenty for instance and get another?
Same with the motor to, as it is either one or the other or both. In the interest of not wasting any more of your money on LiPo's going puffed.
.

[acurusaragon]

Coolice,

I reposition the ESC away from the motor and this afternoon hover it with my 2 bloated battery and ........ after 3 minutes throttle down and wallaaaaaa .... the blade stop spinning ... and how I'm glad ....

but I was flying the Bird at different area ... maybe there's no glitch here

or maybe ... the heat generated from the motor is not affecting the ESC performance since its is now away from the motor ...... anybody have thoughts on this ?

Im sharing the picture below for our info ..

--------------------------------------------------------------------------------

[acurusaragon]

here is another picture without the canopy on

[Coolice]

Hey,

Thats interesting, from what you have now said I'd be more inclined to think the motor was causing interference to the ESC which was stopping it spool down correctly.
Having said that it doesn't explain the puffed LiPo's, this points to either flying for too long or a short. With the new ESC position comes new wiring runs, as you have the carbon Dragonus and carbon conducts electricity you didnt see any bare wires which could have been touching the frames & shorting?
Now you have moved the ESC I am woindering if a couple of the wires were touching somewhere which inturn puffed the LiPo's and caused the ESC not to function to well either.

Check all the major wires for cuts or bare areas, especially where they rub past the carbon frame edges.

Keep us informed as you fly some more.

Here is where mines mounted :

http://www.helifreak.com/album_mod/upload/35b98d303840a98a7a902f77e45714ab.jpg
.

[acurusaragon]

Coolice .... seems fine .... after few lite flying ... the ESC looks ok and thtrottling down seems to be no problem ...... :)

[Coolice]

Hey,

This is good news, glad you appear to have got it all sorted now and can enjoy the model.

Have fun.
.