Pitch

[kianhon]

Stock Belt-CP with stock transmitter.
HOV.PIT=0, IDEL down, when I set my pitch to zero with throttle at midd, my heli barely lift off with throttle stick almost at max. All this time I'm doing -2 degree with throttle down, works fine with hovering and small manuvering, but if I turn idle switch up, it will magnetize to ground even with full throttle. Whats wrong?

[tom dubya]

When your pitch is zero at mid stick is that in idle up mode?

Edit; just read your post closer, you need to have it in idle up mode with the pitch to be at zero at half stick.

[kianhon]

Thnx alot, no wonder it doesn't work,

[cobra314]

My helo originally flew great right out of the box. I had never done any adjustments or set up on it. The other day when replacing a few parts I decided to set it up according to the instructions/pictures posted...ie everything level, at 90, 0 pitch at center stick in idle up mode, etc. I had it set up perfectly. I then took it out to fly. Holy hell, everthing was wrong with it. It would barely get off the ground. It now had a very noticeable backwards drift and a couple of other minor issues. I took it inside and made some adjustments, test flew it, and made some more adjustments. Now it flies great again.

My point that I'm making is that the set up and instructions that get posted are a starting point. Don't just set your stuff up and then think that if it so-and-so says it works perfectly on their helo then it will for mine too. Those set ups should be used as a baseline. Every helo is different.

[kianhon]

I throttle up near half stick and I switch on the IDLE switch, my gear was eaten up by the motor. So my question is, when should I turn on the IDLE switch?

[tom dubya]

Oh no, I'm sorry man you might of misunderstood me. I meant you need to set it up in idle up mode. Which means you need to disconnect your motor before you do anything. Then you can check your pitch range in idle up mode which should be "0 pitch at half stick". Never, well i wouldn't anyway, flip the idle up until your airborne. Watch the finless ccpm 2 vids that they have on this forum, you will understand what i mean better. Here's a link for ya.
http://www.helifreak.com/showthread.php?t=41692&page=13

[kianhon]

I understand how to setup the pitch and the whole head thing. I'm just sad I killed my main gear thread when I flip up the IDLE switch at midd stick before I go airborne.

[copterboy]

Hi Kianhon,
Did you get a copy of the Tx manual? I didn't know it existed till a few weeks ago because I didn't get one with my 'RTF' package!

You will see that it is 'safer' to idle up after 50% throttle/stick on stock tx. The throttle curves both match so you shouldn't get a change in throttle which can make the tail spin out when ideling up. Normally, you will experience a drop in pitch as you idle up after 50% stick, but just give it more stick to increase the pitch (this is why you see it suck to the ground if idleling up before 50%, because the pitch/swash drops!).
(There is a picture of the manual/graphs in the 'linear or logarithym' thread).

Only at 100% stick (when you idle up) the throttle&pitch curves are the same, so you won't get a big change in throttle or pitch - but your heli will be climbing upwards very fast!! (so I wouldn't advise you do it at this point).

As you probably noticed, the swashplate drops when you idle up so you get full pitch range (say -10/+10), and only half the range in hover/normal mode (say 0/+8), this is what the 2 pitch curve's and throttle curves are showing in the manual. Hope it helps (I can go on a bit about these curves at times!) and let us know if you need a copy of that manual (think someone posted a link later in the other thread).

[kianhon]

TX manual? I don't have one. Can you post the link?
I set everything horizontally and 0 pitch with IDLE up at midd stick and 90 degrees servo. But with throttle down and IDLE down, I only get around -1 pitch instead of -2.

[Boddan]

Here is the manual. Download from e-sky's homepage.

http://www.twf-sz.com/english/download/manual/4&6Transmitter.pdf

[kianhon]

The knob on our top right transmitter, the one that says PIT, TRIM. What is it for? I don't see any thing move when I turn that around.

[Ian 777]

Unplug the motor and turn it with the collective stick in different positions, youll see that it alters the pitch at different throttle positions ( as far as I remember) pitch....trim:)

[kianhon]

You mean when I move the throttle stick?
Edit: Ok I notice pitch changes.

My problem still stays. I don't get -2 pitch with throttle down and idle off, only get around -1 pitch. Everything was centered at midd stick with idle on and 0 pitch.

[Ian 777]

As Tom said, If you set the pitch At zero with the throttle stick at mid position in idle up ( with the motor disconected) then it should work out right in normal mode. if not you need to go through your whole head set up as something may be binding. What positive pitch do you get with the throttle stick fully up?

[copterboy]

Sounds like your not getting enough pitch - you said earlier you were trying to idle up at 50% whilst still on ground...?
I'm already in a nice hover at 50% stick, but that could just be my heli setup...?

Make sure you turn both knobs back to 0 when you do the setup too!

If you get +/-10 or 11 degrees pitch in idle up with 0 degree's at mid-stick it should work out to about -2/+8 with +5 degree's at mid-stick, when you flick back to normal mode.

[kianhon]

Idle on:
Full throttle= +9.5
Midd Stick = 0
No throttle = -9.5

Idle off:
Full throttle = +11
Midd Stick = +6
No throttle = +1

I bet I'm off alot. I'm out of ideas. When setting up, all trims in neutral, centered everything as much as I could, made everything horizontal but my pitch still off. Is there a chance that it is because of my blade (plastic 3D-X-400), servo (mine is new sg90) or anything else I don't know.

[Ian 777]

That is strange the mid points should both be the same, the ile up curve is spot on.
does it alter it if you turn the hover pitch down?

[tom dubya]

Yea thats right where you want it. It sounds to me like your not getting enough juice for the right head speed. Check for things that might be binding like the pinion to main gear.

[kianhon]

How pinion to main gear can effect my pitch? My pitch do change if I play around with those hov,pit and pit,trim.

[tom dubya]

It dosen't, but with those pitch readings your pitch should be fine. It sounds like a head speed problem or something else. I had the same problem setting up my new head with the stock tx as far as the pitch is concerned. As long as you have the right pitch range in idle up it should be fine.

If your getting enough head speed with those pitch readings it should get airbourne.

[kianhon]

Ohhh, I think you guys got me wrong. I've been hovering and maneuvering it all these while with -2 pitch when idle down and throttle down, thats all I do in set up, didn't even bother about those centering, 0 pitch, blade tracking (my eye sight have problem seeing colors) or idle settings until recently. Because I didn't crash recently (touch wood) so I'm very free but still wanna spend time with my heli and thats why I start looking problem for myself;). I guess I'll just have to live with my pitch problem until I get CNC and betetr radio.

[tom dubya]

Oh i got ya,you know after i wrote that i realized i might of got your original problem mixed up with something else. But never the less if your happy and comfortable with the way its flying then thats all that matters. But your set up seems fine with the stock tx, thats about what mine is. We are some what limited with what the stock tx has to offer but it does the job.

[kianhon]

Ok, thank to all who helped me here.

[tom dubya]

Anytime, i just hope i helped instead of confused.;)

[Heli Yea!]

Idle on:
Full throttle= +9.5
Midd Stick = 0
No throttle = -9.5

Idle off:
Full throttle = +11
Midd Stick = +6
No throttle = +1

I bet I'm off alot. I'm out of ideas. When setting up, all trims in neutral, centered everything as much as I could, made everything horizontal but my pitch still off. Is there a chance that it is because of my blade (plastic 3D-X-400), servo (mine is new sg90) or anything else I don't know.
It won't affect your pitch but those blades are too short(290mm I have a pair too) to give you much lift that is why you are on the ground at 50% throttle or you didn't put the included stickers over the holes in the blades. My opinion of those blades is they suck and were a waste of money.