Belt cp Help please!!!!!!!!!!!

[olliemorrell]

Right Ive had my belt cp for a few months now. Iv'e been getting better with it and have no issues with the controls.

After several strange crashes which I just put down to wind or human error, tonight something very strange happened with it that threw those two out the window.

I fly in the cricket field behind my house using a completely stock belt cp, servos reciever transmitter etc. Hovering infront of me is usually fine no problem, when I start to circle to the left no issue but as soon as I gain hieght to the right side of me it just becomes uncontrolable. I found it almost impossible to put back into a hover and it was very unresponsive to my imputs. The end result was it heading over me straight into the ground after the tail decided to spin twice. The whole uncontrolable episode lasted for around 30 seconds of battling with the helicopter.

There was next to no wind and powering up did nothing to effect the imput just gain hight. As I said this has happened a few times now and I put it down to human error and wind, although these may have resulted in some of the strange reactions there is something deffinatly wrong with it. I feel so fed up with it I want to jack it in and pretend I never had a go!

If anybody has had a similar incident or has any idea how I can make this machine reasonably controlabe please help!

I have no people that I know nearby that fly helicopters so I can't ask them to try it out etc. Thanks Ollie

[Jonnyheli]

Sorry to be the first to tell you this but your gunna have to buy a few things.

Even if this hadn't happened you would eventually need to buy new parts anyway.

Firstly, I would get towerpro sg90 servos. They are roughly £5 each so thats a total of £20.

A new esc could also help. I know there is a few people here who can hlp you decide for one of those. But mostly they're about £30.

A new gyro. It's not a must have upgrade but its up to you. I personaly don't have a new gyro but alot of people here have bought HH gyros.

And lastly. This is also an optional upgrade but it is recommended. A new Transmitter + reciever. You can buy a DX6I transmitter which comes with reciever for £100 all together. The DX6I is a computer transmitter and is much much much more sofisticated than the stock transmitter.

My main concerns for what happened with your heli is probably. Either the servos, the ESC, transmitter or reciever. But I would get the ESC and the servos first then if the problem doesn't go then you might have to buy a new transmitter or reciever.

So the main suspects are the ESC and servos but it could be the gyro aswell. So your gunna have to buy the cheapest and add them on untill the problem goes away.

-Jonny

[olliemorrell]

Cheers I was waiting to order some tower pro servos this saturday, I have the upgraded head and till coming for it as I was improving and a cheap deal came up on ebay.

I will buy 4 tower pro servos and fit those before flying the helicopter again, if the problem persists which would anyone suggest be the next to changed, rx/tx or gyro first?

I thought the gyro only has a link with the tail and if so the tail isnt usually an issue.

Cheers.

P.S I heard a few people say the stock servo's are cr@p, could anyone enlighten me why exactly. Strip easy, limited movement......

[SierraMike]

Hiy,

Well about the stock servo's. They are indeed easy to strip but thats not the worst. They are not very precise and quick. Which means that ur heli will "stick" It will take a split second before your input on the stick get converted into actual heli movement, thats bad. Also I think that the clearance of the servo's (is clearance the right word? Eng is not my native language...) is way to much, You can move the servo arms of the servo a few mm up and down even if the servo is "active". I suggest TP SG90, just like almost any user here on the forum :lol:
Sander

[Jonnyheli]

Ollie, if your tail isn't really an issue then I think you should buy an ESC (electronic speed controll) next. They are not very expensive and they can handle a lot more amps. I don't know much about esc's but the stock one isn't very good and they have cause a few problems with other people in the past. I think a good brand esc for the belt cp is the scorpion ones.

However, if you are having trouble with the tail then get a new gyro. And you will already have the sg90's so that means you will have a new gyr and tail servo so that should no longer be an issue if it already isn't.

-Jonny

[mnwizard]

...Iwhen I start to circle to the left no issue but as soon as I gain hieght to the right side of me it just becomes uncontrolable....

Before you change anything, let's try and find out what's going on.

Unplug any two of the three wires from the motor so the motor won't spin up.

Turn on the Tx and then plug the battery in.

Repeat the control movements you made when it went out of control and watch the movement of the swash plate. If all looks normal, then disconnect the ball links from the servos and watch to see that all the servos move when they're supposed to. If one of the rear servos is bad you might not notice it from the swash movement. Don't forget to check the tail servo. And make sure that with no control input, all the servo arms return to the center of their travel which should be at a right angle to the servo. I'm pretty sure you're going to find that one of the rear servos isn't moving, or is stripped.

[xip21r]

Ihad a similar (if not the same) fortunately while practicing in the simulator,one day
was all fine the next day i could't even hover :shock:.
Revealing the Tx inputs on my screen i saw that after the takeoff i had repeatidly
getting small and high frecuency inputs of left aileron and mostly elevator movements
that made the helli uncontrolable.
The solution as many know in here was some spraying with contact cleaner spray
inside the pots and hard movements on the sticks and here you go hovering again;)

[olliemorrell]

Cheers for all the replies guys, after a close inspection today it turns out one of the rear servos is duff,how long it has been like that is a mystery. I can't work out if it works sometimes then doesnt an other. Also I am not sure if this may have happened in the crash altho no teeth are stripped,just a heavy landing. And as the smart ar$e :p said it was tricky to see on the swash plate movements.
Earlier in the week I managed to succesfully spin the tail round 360 nice and quickly whilst keeping it in the hover(nothing special but still practising). Soon after bringing it to the hover, attempting to move the tail again the rear servo locked on causing it to go into a spiral of death,thankfully I had it in a hover at the time only a few feet of the ground and resulted in a heavy landing on the skids,but no damage.

It really does leave me to believe that as everyone says, these servos are bull. I am straight on the case to replacing them and shall report back with the results.

P.S I have a different 7 channel rx/tx, would it be worth changing to that too? Still fm tho.

Thanks Ollie

[Jonnyheli]

Yeah, it is suprisingly easy doing a 360 spin (pyro)

I suggest you get towerpro sg90's they are very cheap and you can get a full set for £20.

If the 7 channel tx + rx is compatible with helicopters then I would say yes. Is it a computer tx? Does it have a screen with lots of menus? If so then you shoulddefinatly use it.

-Jonny

[olliemorrell]

Yep the tx/rx is compatible with the helis. I can unplug the motor and see if it works anyhow, cheers for the response. Will let you know how it goes when I get it back up and running again. Cheers

[Jonnyheli]

Ok:thumbup:

[olliemorrell]

Right , tower pro servos and the metal upgrades have been fitted. Just waiting for the main gear tomorrow and then it will be up and running again.

Metal upgrades are on as I managed to get the whole set for 26 quid instead of 90.

Still with the old fm gear so Im going to drive a couple miles away from the town Im in and fly it in a field I have available to me, hopefully this will get rid of any interferance I was getting. Will let you know how it goes later in the week.

[Jonnyheli]

All soundss good Ollie.

All the best.

Ps. FM isn't that bad. It can get interference from other stuf but it is rare to happen. The only time you will definatly get inteference would be if someone was flying a helicopter or driving an rc car etc with the same frequency at the same time. And they would have to be quite near you.

-Jonny

[olliemorrell]

Right tried out the new servo's and all fine and dandy.

One thing, kind of major. Someone had writen earlier in the post about it and I was aware of the problem, but it turns out the pots on the tx were naff. Moving the stick slowly would cause the main 3 servos to judder for a short while. All sprayed and its working ok now.

Just got to wait for the weather to clear so I can try it out.

Just out of curiousity, will the tower pros increase performance or will it be the same,just better quality. Also will 325 blades make much of a difference from the 315 blades?

Cheers

[olliemorrell]

Flown it in my back garden today, nothing special but with the tower pros the controls are far more responsive and with the metal parts the heli feels so much more stable. I had no sign of glitches or sudden movements either which was brill. Fingers crossed :)