CX 4 in 1 problems

CX 4 in 1 problems
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CX 4 in 1 problems - 8/2/2006 1:36:38 AM

98XJSport

Posts: 4
Joined: 7/30/2006
From: Farmington, ME, USA
Status: offline

I bought a Blade CX back in march. Within the first 3 flights I had problems. With no throttle input, the lower set of blades would take off as though it was at full throttle, while the uppers did not move at all. I opened up the cowling and could tell that the 4 in 1 was burnt. So I took it back to the hobby shop, they wouldn't touch it since it had been flown. So off to the factory. They repaired the 4 in 1, after about a month, and I got it back.
Due to the weather I didn't fly for a while, then maybe once a week at best in the last 2 months. So a little over a week ago I go to take off and it happened again! Ive had no serious crashes with this thing, and I fly with 2 guys that have them and bought the same week as mine, they have done some serious crashes with no problems from the 4 in 1. So its off to the factory again to see what's going on.
Is it something that Im doing that could cause this? I always throttle down when about to crash, never near water. I baby the thing but it still happened. Is there any other possible culprits besides the 4 in 1 that could cause the damage? Or does mine just suck...

Thanks for any help.

Post #: 1

RE: CX 4 in 1 problems - 8/2/2006 2:20:51 AM

Psikelly

Posts: 1024
Joined: 2/19/2006
From: Ottawa, ON, CANADA
Status: offline

You need to set the proportional mixer. Whats happening is motor is spinning faster than the other. Thats what the proportional pot is for. It is used for balancing the motors speeds so that they are in sync. Theres probably nothing wrong with your 4 in 1. You need to consult your manual and find out where it tells you how to set your proportional. Im 99% sure thats what your prob is

_____________________________

NO I did not just crash!! Im making it flop around on the ground like that on purpose. Its a new stunt.

(in reply to 98XJSport)

Post #: 2

RE: CX 4 in 1 problems - 8/2/2006 2:26:34 AM

Psikelly

Posts: 1024
Joined: 2/19/2006
From: Ottawa, ON, CANADA
Status: offline

Actually theres a possibility that something is tight. Like maybe a tight gear mesh

Check your rotors and make sure they move equally smooth b4 you try your proportional. Just make sure all your moving parts on the heli move smooth THEN if theyre all OK adjust your proportional

_____________________________

NO I did not just crash!! Im making it flop around on the ground like that on purpose. Its a new stunt.

(in reply to 98XJSport)

Post #: 3

RE: CX 4 in 1 problems - 8/2/2006 4:30:44 AM

ct420

Posts: 1177
Joined: 3/26/2006
From: mansfield, TX, USA
Status: offline

Also, you could have a bad motor, or frayed motor leads, or something of that nature that is causing that channel to 'suck' too much current.

(in reply to Psikelly)

Post #: 4

RE: CX 4 in 1 problems - 8/2/2006 11:53:36 AM

98XJSport

Posts: 4
Joined: 7/30/2006
From: Farmington, ME, USA
Status: offline

Definately not the motor pot. Like I said, with no throttle input, the bottom blades run full speed. Nothing from the top. I have not touched the trim pot prior to it going nuts. I cannot get it to stop spinning the bottom rotor.

Ive also tried using my 4 in 1 on a friends heli, made his do the exact same thing.

(in reply to ct420)

Post #: 5

RE: CX 4 in 1 problems - 8/2/2006 12:37:38 PM

Psikelly

Posts: 1024
Joined: 2/19/2006
From: Ottawa, ON, CANADA
Status: offline

Well even thogh they say every heli is test flown for qality assurance I dont believe it. When I first boght my CX the proportional was way out and it kept spinning to the left. The bottom gear was also binding a bit sp theres no way they test flew this or Im sure they wouldve set it up properly.I guess Its possible that the motor spinning has a small short in it .You could try reversing the leads on the 4 in 1 and see if the top one does it. The fact that it does it on your friends heli sggests the 4 in 1 though. Have you at least tried adjusting the proportional??Because although you never adjusted it to make it act weird doesnt mean that a good bumb might have knocked it out a bit. Im sure stranger things have happened

_____________________________

NO I did not just crash!! Im making it flop around on the ground like that on purpose. Its a new stunt.

(in reply to 98XJSport)

Post #: 6

RE: CX 4 in 1 problems - 8/2/2006 1:23:08 PM

Psikelly

Posts: 1024
Joined: 2/19/2006
From: Ottawa, ON, CANADA
Status: offline

You couuld also try switching the motor leads. Bottom in the top and top in the bottom. Then if your TOP blades spin wildly at least you know its not a motor problem. But with the leads switched if itstill happens to the bottom motor then you know wiring maybe the problem. Youll want to troubleshoot the heck out of that thing to eliminate everything else B4 you go replacing your 4 in 1. Id only do that as a last resort. Sux having to screw around that much B4 you can fly it though.

_____________________________

NO I did not just crash!! Im making it flop around on the ground like that on purpose. Its a new stunt.

(in reply to Psikelly)

Post #: 7

RE: CX 4 in 1 problems - 8/2/2006 5:52:06 PM

98XJSport

Posts: 4
Joined: 7/30/2006
From: Farmington, ME, USA
Status: offline

Ive tried switching around my motors, friends motors, etc. The top blades still respond correctly to throttle input, its just the motor that is on the bottom output of the 4 in 1 that does it. Hopefully the factory will have some answers.

(in reply to Psikelly)

Post #: 8

RE: CX 4 in 1 problems - 8/2/2006 6:17:45 PM

ct420

Posts: 1177
Joined: 3/26/2006
From: mansfield, TX, USA
Status: offline

quote:

ORIGINAL: 98XJSport

Definately not the motor pot. Like I said, with no throttle input, the bottom blades run full speed. Nothing from the top. I have not touched the trim pot prior to it going nuts. I cannot get it to stop spinning the bottom rotor.

Ive also tried using my 4 in 1 on a friends heli, made his do the exact same thing.

Are you saying that the bottom rotor spins at full speed even with no throttle input? Does it start spinning the very moment you connect the battery? If so, then one of the MosFET controllers on your 4 in 1 has gone dead short, and needs to be replaced, most likely...

(in reply to 98XJSport)

Post #: 9

RE: CX 4 in 1 problems - 8/2/2006 11:11:37 PM

98XJSport

Posts: 4
Joined: 7/30/2006
From: Farmington, ME, USA
Status: offline

quote:

ORIGINAL: ct420

Are you saying that the bottom rotor spins at full speed even with no throttle input? Does it start spinning the very moment you connect the battery? If so, then one of the MosFET controllers on your 4 in 1 has gone dead short, and needs to be replaced, most likely...

Exactly. Which is what I think went wrong the first time. I couldn't tell if it was the same this time because when they "repaired" it they covered it in some sort of white insulating goop. Im more wondering why/how it happened, and if its something common. The only time Ive seen damage like it is power surges, which aren't likely in this scenario.

(in reply to ct420)

Post #: 10

RE: CX 4 in 1 problems - 8/3/2006 12:49:34 AM

ct420

Posts: 1177
Joined: 3/26/2006
From: mansfield, TX, USA
Status: offline

Did you crash it at all? Even slightly? If a rotor blade struck anything, then it is possible that you just didn't get the throttle pulled back in time, and the overload took out the mosfet.

Of course, there are many other possibilities. It is also possible that the mosfet went bad due to harmonic vibration (resonance). If your rotor is badly unbalanced, it will create a resonance vibration at speed, which will KILL many electronic components.

Or, it could be that the motor or wires or something on that channel has a problem, causing it to draw too much juice.

It is possible that the mosfet simply was defective when installed. It is not too uncommon for new components to quickly go bad. Especially high current components like these mosfets. If there is any tiny little defect when it is manufactured, it will fail very quickly if it works at all.

I could go on, but I'll stop, 'cause you get the idea.

Do you have an amp meter? If so, try measuring the current draw of each motor at full speed, and see if one seems a lot higher than the other. Also, use an ohm meter and visually inspect the wires and plugs to make sure there are no shorts anywhere. This is where I would start.

Of course, you are going to have to get the 4 in 1 fixed again, I'm afraid.

(in reply to 98XJSport)

Post #: 11

RE: CX 4 in 1 problems - 8/3/2006 12:57:01 AM

ct420

Posts: 1177
Joined: 3/26/2006
From: mansfield, TX, USA
Status: offline

quote:

ORIGINAL: Psikelly

Well even thogh they say every heli is test flown for qality assurance I dont believe it. When I first boght my CX the proportional was way out and it kept spinning to the left. The bottom gear was also binding a bit sp theres no way they test flew this or Im sure they wouldve set it up properly.I guess Its possible that the motor spinning has a small short in it .You could try reversing the leads on the 4 in 1 and see if the top one does it. The fact that it does it on your friends heli sggests the 4 in 1 though. Have you at least tried adjusting the proportional??Because although you never adjusted it to make it act weird doesnt mean that a good bumb might have knocked it out a bit. Im sure stranger things have happened

I believe that they test fly it, but I doubt that it's much of a flight. If I had to guess, I would say that they fire it up, and if they can lift off and quickly land again without crashing it, it passes

However, I have to say that my BCP was actually set up fairly well out of the box. Certainly could have been better, but it flew reasonably well...

My E-sky Lama2 was a different story, however

Took me about 1 month to get that thing flying really nice, but I sure had a blast with it after that

(in reply to Psikelly)

Post #: 12

RE: CX 4 in 1 problems - 8/3/2006 2:26:58 AM

Psikelly

Posts: 1024
Joined: 2/19/2006
From: Ottawa, ON, CANADA
Status: offline

Yah I guess maybe they test fly them but its just that. A test. I dont think they set up the heli for you. Just as long as it flies

_____________________________

NO I did not just crash!! Im making it flop around on the ground like that on purpose. Its a new stunt.

(in reply to ct420)

Post #: 13

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