Pitch and binding

[Cralis]

Can't undo the screws. They're solid.
Oh no.............

[Edders]

what screws?

[Cralis]

The ones that hold the little arm to the rotors, to shorten it..

[Cralis]

Alas! The plastic thing clips off. No need for screws..

[Edders]

you should be able to pop of the linkages with out undoing the screws

if once youve adjusted them you still arnt at zero adjust the three linkages from the swashplate to the servos

I gotta shoot hopefully you can work it out

Edders

[Cralis]

As short as can be - Full neg gives -7 degrees
Middle stick gives 5 degrees
Full stick binding and off the scale. Seem better... I think...
Investigating more.
Looks like swash now?

[SimonN]

ATV = EPA?
If so, EPA is set to 100% for all channels.

Swash is set to 62% for channel1 (Roll, swash servo 1)
5% for channel2 (Pitch (Servo 2, 180 degrees))
-69 for channel 6 (Pitch (Servo 3))

Edders is probably a lot more experienced than me, so please take his advise BUT.....

Isn't 5% too low for channel 2 ? A quick check shows that I used about 60% mix. Does the swash look like it's moving correctly (with the exception of your pitch problem ??) Humour me here, but try setting all of the mixes to 60% (one will have to be negative - probably channel 6 looking at your current mix).

Simon

[Cralis]

Tx charging.. but will try that soon, and report.

[Cralis]

OK, here's my current settings. Seems nearly there, just shifted too far down..

Throttle Curve: 0,25,50,75,100
Pitch Curve: 0,25,50,75,100

CH1: Swash = +65
CH2: Swash = +59
CH6: Swash = -64

At low stick, blades go to -13 degrees
At middle stick blades are at -4 degrees
At high stick blades are at +8 degrees

Seems it has to be shifted up 4 degrees somehow. Can that be done?

[SimonN]

Seems it has to be shifted up 4 degrees somehow. Can that be done?

Yep... You need to adjust the linkage rods that go to the blade grips. I'm at work at the moment, but I'm pretty sure you need to lengthen them. Are they the ones you shortened earlier on in this thread ?

Why have you set the mix %'s different for each channel? Set them all the same for now (apart from having channel 6 as a negative).

Let me know how you get on !

Simon

[Cralis]

Great stuff. Lengthened them, and now we're half way there. In say half was, as one blade is perfect! +10, 0 and -10 degrees on thr spot.

However, the other one is +10, -1.5, -13.

Is that a mechanical problem, or can that be fixed with the radio?

The fact that the positive pitch is correct, surely means it's more a mechanical problem? If I go messing with the swash now, the correct blade will become broken, no?

[Edders]

I just assumed it was a typo

to get positive you need to shorten the double links but I guess you already maxed out that option
play with swash ones until you get it close then you can if needed use teh two long ones that are part of the head (but I would try not to adjust any of them)

as mentiond try having the same swash mix unless you have issues with swashplate interactions (if you dont know what it means then your better off just setting tehm to all be the same)

Edders

Edders is probably a lot more experienced than me, so please take his advise BUT.....

Isn't 5% too low for channel 2 ? A quick check shows that I used about 60% mix. Does the swash look like it's moving correctly (with the exception of your pitch problem ??) Humour me here, but try setting all of the mixes to 60% (one will have to be negative - probably channel 6 looking at your current mix).

Simon

[Edders]

Great stuff. Lengthened them, and now we're half way there. In say half was, as one blade is perfect! +10, 0 and -10 degrees on thr spot.

However, the other one is +10, -1.5, -13.

Is that a mechanical problem, or can that be fixed with the radio?

Check the two linkages that control that blade and make sure they match teh size of the other set

Edders

[Cralis]

They seem to be the right length. As in, but the same. Not sure if you can tell much from the attached images. Also, can I photograph something else that might help diagnose the problem?

I find it strange that the one blade is moving from -10 to +10 degrees OK, and the other isn't. The 'faulty' one seems to have less movement. But they are both controlled by the same servo (Right?).

[SimonN]

eCCPM is a funny thing, with all of the servos moving at the same time. It's not as simple as one servo doing one thing, and another servo doing another thing !!

I would suggest that firstly you set all you mix values to the same % on the TX. Next check that the ATV / EPA is the same for them all as well. Then measure all the linkages again. It'll be pretty obvious which ones should be the same length. If they are, it should all be fine and you'll get the same pitch on each side.

Yes you probably could get round the small differences you have using settings on your TX, but this is definately not recommended. The heli needs to be mechanically right to fly properly.

Simon