Need help please

[jvalovcik]

i got a new RTF e-sky Belt-cp had it up for about 1 battery my servo went out and i had a crash. then i put new hitec servo in it and changed to my futaba 6 2.4 Fasst radio everything seem to be straight blades balanced and the tracking looks good but!
when the heli lifts off the ground it goes sharp to the left and rows to the left and there goes the main blades again. and i do have training gear on the heli

i replaced the feathering shaft, main shaft, flybar & paddles, swashplate set and main blades.

can anyone tell me why i can not get the heli to hoover?

[Finless]

This forum is for asking for help on how to use the web site.

You question needs to be in the E-sky forum. I am moving it there so you get your answers.

Bob

[wibble]

i got a new RTF e-sky Belt-cp had it up for about 1 battery my servo went out and i had a crash. then i put new hitec servo in it and changed to my futaba 6 2.4 Fasst radio everything seem to be straight blades balanced and the tracking looks good but!
when the heli lifts off the ground it goes sharp to the left and rows to the left and there goes the main blades again. and i do have training gear on the heli

i replaced the feathering shaft, main shaft, flybar & paddles, swashplate set and main blades.

can anyone tell me why i can not get the heli to hoover?

Can you please be a little more descriptive!

1/ Which servo went out?
2/ What does this, "it goes sharp to the left and rows to the left" mean exactly?
3/ Might we assume that this, " i replaced the feathering shaft, main shaft, flybar & paddles, swashplate set and main blades." means that you replaced all of these parts because of the nasty crash? Did you check the frame?
4/ These helis don't "hoover" too well, :lol: they tend to do the opposite and kick up a lot of dust.

Welcome to the Belt CP section ;)

[Grant_beltcp]

I presume you've checked, but did you reverse the hitec servo? i found all mine to be opposite to the standard servos. The would mean that as the other 2 servos rise the swash to increas pitch the hitec one will go down and bank the heli in that direction.
If you have done that then maybe one of the other servo's?

[another_finn]

Did you actually mean you swapped only one servo? You should really use the same type on all points of the swashplate - that single Hitec is just not going to respond the same as the others, even if you do even out the endpoints. You're almost guaranteed to get some swashplate interaction, which could easily explain why the helicopter wants to tip over so hard when you add collective.

[Ian 777]

I'm with Grant and Mika: Disconnect the ESC and watch how the Swashplate moves when you throttle up.

You need the same type of servos on the swash

Ian:)

[Grant_beltcp]

You can sometimes get away with using 1 different servo - but my hitecs were reversed and had a different travel to the standard servo's. It is possible to adjust the centre, start and endpoints of the servo to match up closely if thats your problem and cant afford new servos for a while.

[Ian 777]

The Hitecs are twice as quick though arn't they Grant?

[Grant_beltcp]

Not sure on specs, but i am sure theyre much faster - for general slow flying they should be ok - i used one with 2 sg90's ok. took abit of programming to get it right though.

[DierWolf]

yes cause is reverse servo, upon collective up the left servo will pull downward instead causing the left cyclic bank rolling it over...

[Jonnyheli]

yes cause is reverse servo, upon collective up the left servo will pull downward instead causing the left cyclic bank rolling it over...

I think this maybe be the answer!

If you have only changed one servo (eg. left cyclic servo) When you add throttle the collective will go up. But the one on the left might be reversed causing it to pull down.

So because the left servo is pulling down it is tipping over left.

You should either get all the same servos and flick the aileron switch to reverse and maybe the elevator switch. Or you can reverse the servo that you replaced... somehow.

This might not be the cause but it sounds like it is. I have tried explaining very cear but if you still don't understand just lets us know and we will try to explain as clear as possible what you need to do.

-Jonny

[jvalovcik]

I did replace all the servos (3) HS-55 (1) HS-50.

When I disconnect the motor and I move the sticks and the Swashplate stays horizontal when I throttle up or down.

When I remove the main blades and give it very little throttle the flybar and paddles stay horizontal also.

Can the pitch of the blades be changing when I throttle up?

The blades seem to be tracking at low throttle but I can no tell what it does at higher throttle.

It’s strange because everything seems to move in the correct direction when you move the sticks.

Just before the heli is about to lift off the ground I will move the sticks to the right, left forward and back and you can see the blades move the way they should.
But when I continue to give more throttle it will move to the left then I give right to correct it but it keeps going the when I does lift it tips till the blades hit the ground.

What am I missing?

Can the servos be changing at high speed? Or can I have a servo that has a gear slipping at high speed? If so how can I check it?

[DierWolf]

disconnect the connecting rod on each servo and make the movements with the stick while holding the horn if you hear any clicking then teeth are missing.

Sounds to me though like your just having further travel on one of the servo's (mainly the right one)

How did you level your swash? at mid stick or at zero??? i level mine at 60% throttle that way i dont get much ccmp interaction (with stock radio)

Also make sure as your collective goes up your washout block isnt jamming on the main shaft anywhere that could throw things off as well.

[Ian 777]

If it was just different travel on the two servos putting right stick in to compensate would
work you'd just be badly out of trim

It sounds like putting right stick in to compensate is having the opposite effect!

Are you positive the swash is tilting to the right when you put right stick in?

It sounds as if its working the wrong way because of the polarity of the Hitec servo's

Did you use the servo reversers to get the collective pitch to work in the right direction?

If so you need to put negative values in your Aileron swash mix adjustment, this will make the swash move the other way when you move the aileron stick.

[another_finn]

Too elementary. He already confirmed the swashplate is moving straight up and down under no load, and the rotor disc tilts where it's supposed to. Binding would have been visible during the collective travel test, so that leaves us... what? A servo that can't handle strain as well as the others? It does happen, even to Hitec. If that's the case, swapping the left and forward servo should transform the problem to a forward tilt. If that's the case, it's another servo that needs to be changed.

Can't really think of much else at the moment... If it was something to do with blades or head mechanics, you'd expect it to be all over the place rather than always going left.

[Ian 777]

Sorry yes Mika I mis-read that line, cant understand why the problem seems to get worse when he puts in more right stick to compensate though!??

[another_finn]

I didn't read it as getting worse... Just not improving much :)

My money's on the left servo dying under load. Might be a slipping gear, or even a problem with the motor or electronics. If it's something other than damaged gears, the ESC might be getting noticeably hotter than it should, too. A bogged down servo can really strain the BEC circuit, even to the point of thermal shutdown or permanent damage.

[jvalovcik]

Thanks guys :)

I just got (3) new HS-55 servos and I am waiting for a new set of main blades I will change the servos and try it again and see if it does the same thing or if it does something new
I will let you know later.

Thanks again
Jvalovcik

[jvalovcik]

Hi Guys

I put (3) new hs-55 servos and I balanced the blades (it took a lot of tape to balance them)
I thing I got rid of the going left problem but now I am afraid to rev it up to see if it will lift off the ground to see what will happen. (I just got one set of blades)

I did notice that when I tie the Heli down and rev it up I move the sticks right, left, front & back and the fly bar will lean right, left, front & back but the main blades stay horizontal it that normal? I thought that they should move parallel with the fly bar, is that correct and if so, does it happen at higher speeds? If not why is it doing what it is doing?

I have a club meeting Sat. May 3, I think I will take the Heli with me and let one of the Heli Pilots check it out.

I want to do a short video to show you what it is doing but I am not sure what type of file I need to make and how do I upload it to a reply? Or make a link some where.

Can someone let me know how to do this?


Thank You
jvalovcik

[jvalovcik]

Hi Guys

i forgot to ask how do you set up your pitch do you have the stick in the middle and pitch set to 0 deg. or do you have stick all the way down and set the pitch at 0 deg.

what should the pitch be before it starts to lift of the ground and should it be at mid stick or just above mid stick?

Thank You
jvalovcik

[Ian 777]

Stick in the middle in Idle up mate:)

Usually about 70% lift off, watch Finless Bobs, Trex 450 CCPM set up vids...

[jvalovcik]

Hi Guys

I had put my heli on hold for awhile, just got frustrated with it. I tried it again and had to put alot of pitch in to get it to lift off the ground. I now have a problem with the tail.
When I try to lift off the nose goes left and tail goes right. I added all the right stick I can, with maximum travel on the tail but cannot get the nose of the heli to go to the right. I checked the tail belt and it is not slipping. Do you think it might be the motor, which I had not used very much since I can not get the heli in the air? Or do you think since it needs so much pitch to lift that the tail rotor is not going fast enough to handle the torque? If so what can I do?

Thank You
jvalovcik

[another_finn]

With a very low headspeed and very high pitch, the tail might not have the power to fight the torque - but have you checked all the basics first? Tail going in the right direction, tail blades facing the right way, full slider travel available with the tail servo?

[helihathnofury]

... and is that little allen nut holding the tail rotor blade holder assembly nicely and tightly located in the slot on the shaft???????

[kianhon]

Jvalovcik.. (http://helifreak.com/member.php?u=39370)

I think you are still new to this hobby. You need to look at the stickies on how to set up the whole heli from head to tail. If you keep asking question one by one when you encounter a problem (which you will), you will never get your heli up on air anytime soon, & that will be very discouraging for you. Look at the sticky that teach you how to set up the entire head block, then look for tail setup.