My blade is jumping.

[Clean]

I went to www.bladecprepair.com and i fixed my heli but when i went to fly its was jumping and when the battery pack fell the heli went into the air but i forced it down. Is my heli to heavy or is the motor to weak ? The guy i got it from used Li Po but i use the Ni MH. Whats wrong with my heli can anyone tell me ? Can it be fixed ?

I have normal Blade CP not CP Pro.

[HeliDan]

Is it a Blade CP or CP Pro? The pro will work with NiMH but the CP Pro will not unless you change the motor pinion gear to a ten tooth.

I had the same thing happen to my CP Pro. Once I bagan using the LiPo, it then flew, but with me at the control I am not sure that flew is the right word. I got it airborne then ground-borne! :arggg: then fix then repeat!

Good luck!

[Clean]

No its blade cp not pro but the guy was using Li Pos but i use Ni MH.

[HeliDan]

No its blade cp not pro but the guy was using Li Pos but i use Ni MH.

Ask him if he switched the pinion gear. Or take it out and count the teeth. If that is not is then I dont know but am now curious.
My guess is that this is the right track because there is not a big difference between the weight of the two batteries. The main difference is the voltage/current rating. The fact that it works with the LiPo but not the NiMH sounds like a headspeed issue.

Is there any wobble, or a rotor-blade tracking problems?
How old is it. The brushed motors used in these things have a limited number of flights available. Thats one other possibility. The higher voltage of the LiPo may 'buy' a little more life out of the motors.

[Clean]

Oh ok.

I dont think it has any wobble or rotor-blade tracking problems is there a way to tell ?

Yea iam a total newb at this .

[HeliDan]

Well, the wobble or vibe will be obvious. the tracking is stand to the side of the heli, while holding the heli down, either by hand (with a small heli) or by placing a 1X4 through the skids with a lot of weight on each side of the plank and power up. Make sure that the rotors are close to tracking the same. You're looking for the rotors to be in the same 'plane' with each other. If the tracking is off, then weird things can happen.

[Clean]

So is that really serious ?

[HeliDan]

So is that really serious ?

A blade tracking problem can damage the main shaft and cause it to not fly well or at all depending on how bad it is.. I have only been flying a few months and am by no means experienced or an expert, but I am going by what I have experienced myself.

[Clean]

Well, the wobble or vibe will be obvious. the tracking is stand to the side of the heli, while holding the heli down, either by hand (with a small heli) or by placing a 1X4 through the skids with a lot of weight on each side of the plank and power up. Make sure that the rotors are close to tracking the same. You're looking for the rotors to be in the same 'plane' with each other. If the tracking is off, then weird things can happen.

Ill try that and then ill tell you what happend ok ?

[HeliDan]

I know it is frustrating. Im there to!

Good luck

[SteveTTL]

My blade cp started jumping a couple of months ago. It turned out to be a problem with the front servo. I replaced it, then the problem was solved. It might be worth making a close check on the three servos.

[BigMike]

Oh ok.

I dont think it has any wobble or rotor-blade tracking problems is there a way to tell ?

Yea i a total newb in this .

At the risk of sounding rude, I'd say read your manual. If you don't have one there are a thousand places on the net that will tell you how to check the tracking on your blades.
Put different color tape on the blade ends, hold the heli in one hand and spin up the blades while looking to see which color is higher than the other. Adjust.

[Pinecone]

Blade manual is available online at www.horizonhobby.com

[matthewgow]

Hi Guys,
I'm experiencing the same issue right now with my helicopter I was almost ready to trash it http://www.helifreak.com/images/smiles/BangHead.gif
Banging Head. After a crash I had to replace the gears in 2 servos (front and rear right) seems the servo's are working fine and my tracking is not excellent but pretty good. So I took it outside for a test flight after fixing it all up and had the jumping problem, up in the air and back on the ground and so on. I pushed it a bit too far and ended up crashing and breaking my tail boom. lucky I have the super skids otherwise those would have been trashed as well.
So my questions for anyone who can answer them for me are:
How do I tell if my servo is bad...
and if the servo is good how do I tell if the motor is screwed?

Thanks in advance guys,
Matt :arggg: :arggg: :arggg: :arggg: :arggg: :arggg:

[Pinecone]

To check servos, diconnect both motors, and then turn on and move the sticks around, slowly and rapidly. See how things move.

[carlo_the_wonder_frog]

There are only a few things that can cause the problem you are having. Headspeed fluctuations; You can easily hear the motor RPMs change, if this is the case it is either the motor, bad bearings, ESC. If the rotor stays turning the same speed, but the heli is going up and down then you either have a servo that cannot hold center, binding in your collective or tracking problems. Also check your batteries , they do go bad after a while, only good way to check is to get a known good battery and compare the two. One other thing to look for, make sure your paddles are perfectly lined up with a horizontal plane at 0 pitch.

Check your servos by unplugging the motors, run your collective up and down and look for any of the servos to jump.

If all else fails, do a complete breakdown of the head, check all bearings. Clean and lube the parts that need it, replace worn or almost broken parts. Ensure the rebuild goes exactly like the manual shows. Should fly after all that. If it still doesn't work, try a new transmitter.

[matthewgow]

Thanks for the advice Terry and Carlo, I'll give it a shot when I get some time. Spend more time fixing than flying.

[Pinecone]

I also found my Blade would get jumpy if even one light was out on the Tx. Switching to my Hitec Eclipse has made the heli less jumpy. SO the Tx may be low on power or stability.

[Clean]

I am going to talk to LHS ppl and see what thy tell me. Thanks to You all.

[stikflyer]

Clean, if you are still having problems with your heli we do not live too far apart and I can take a look at it and try and help you out if you want.
let me know.
Kevin.

[F1Atom]

Sounds like a motor problem (maybe). I had the same problem with my Blade it started jumping like a frog on crack. After swaping the old main motor for a new one, I checked the old motor and there were no brushes at all. After I did the change my heli flys very well.

[Clean]

Clean, if you are still having problems with your heli we do not live too far apart and I can take a look at it and try and help you out if you want.
let me know.
Kevin.

That would be great I live in Dartmouth NS the map shows Halifax i dunno why but still ts not that far.

[chopperdudes]

servos, the end. hold it in your hands, spool up, look at the swash, and you can see that when the blades are approx. 0 degree, the swash and the blades will 'flutter'. this is due to the slop in the servos. there's no real fix, just take off and i should be fine. you can try to replace the servos (possibly with something better than S75's).

[ch47dfe]

Also check your blade angles with a pitch gauge.With your Tx on and trims at center (unplug your main motor and tail motor connectors from 4n1). Swashplate should be level, then check blade angles. Blades might not have enough pitch in them to keep it at a stable hover. I had that happen to me after a bad crash.

[ballwall]

dudes it's easy if you have a head wobb it's the main shaft after you replace it get the tracking right thats all you have to do