Pitch Curve off 1 degree at Half Stick???

[Jeff Palmer]

Im trying to set up a stratus pitch curve for 11, 0, 11, everthing is great at top and bottom but at center its off a full degree. Does anybody know what causes this?? on my extremes it allways works out to 0 degrees at half stick.

and what is the best way to fix this under pitch curves so at half stick its reading 0 degrees.

Thanks for the help!!!

[RCfan]

Is the discrepancy on the 14MZ display alone or is the pitch actually 1 deg off on the Stratus at midstick (i.e. servo position)? If it's only the 14MZ, go into the Pitch screen, open the Angle window and recalibrate low, mid and high stick angles. If it's actual servo position, then you'll probably need to send it in to recalibrate.

[Jeff Palmer]

its fine on my other extremes, even some of my friends has the same problem,

what happens is, i have 11 on bottom and 11 on top, that part is fine.

the problem is at newtral, im 1 deg. off, this is useing the servo monitor and zero out the servo's to check mid stick, now i can use x offset to fix this, but my question is, is this the best way to fix this or is there a better way???

Thanks

[RCfan]

Are you saying the servo monitor is showing +/- 1 at around mid-stick (which is not 1 deg., but rather 1%; 1 deg. being something ridiculous like 8-9% rate miscalibration)? I assume you don't have any sub-trim on the pitch channel or enabled any of the Hover Pitch Trim settings under the Pitch menu, right?

[Jeff Palmer]

at mid stick, 50 %, my pitch gauge says 1 deg. off from 0 pitch.

[RCfan]

Sounds like a heli setup error, not radio related. Hard to say without seeing it.

[Jeff Palmer]

Sounds like a heli setup error, not radio related. Hard to say without seeing it.

i've check everthing, all new kit , all new servos, all new receiver

[RCfan]

Again, hard to say without seeing the heli ... :dontknow Find a local expert to give your aircraft a once-over. Or, if you can, post pictures of the setup showing the different pitch positions.

[RCfan]

BTW, using the servo monitor neutral test is pointless to identify 0 pitch if you have (sub-)trims involved!!!! Neutral test ignores trims, so make sure you are checking this correctly.

[Jeff Palmer]

i never, ever, use sub trims.....

This is the 7th kit i built, i don't think its building related, i know of three other people with the same problem, my Fury Extremes have never had this problem,

Thanks,,,

[RCfan]

Post your model.

[DavidH]

I agree with RCfan. Sounds like a mechanical setup issue to me and not a radio problem.

When you did the setup, did you adjust the linkage to be 0 degs at midstick ( 50%)?

Or did you just set up 11 degs positive and 11 degs negative and assume it would be 0 degs at mid stick ( 50%) ?

David

[Jeff Palmer]

I've tried Both ways.

[DavidH]

When you did the setup, did you adjust the linkage to be 0 degs at midstick ( 50%)?

So when you set up 0 degs at midstick with the pitch curve showing 50%. Your saying it moved 1 deg off for some reason?

If that is the case. I would think you have the hover pitch program activated and moving the knob or slider after the mechanical setup of 9 degs.

David





























6

[Jeff Palmer]

if i set up at 0 deg's at half, i have 10 on bottom and 12 on top.

[DavidH]

Sounds like the mechanical setup is off some. Swash plate needs to be lowered by a couple of turns on each of the three rods and then the bell mixers reset to 0 degs. It is not uncommon to have to do this. Nothing wrong with the radio, just the mechanical setup needs adjusted in my opinion.

-10 to +12 = 22 degs of range. 50% of 22 = 1 deg positive.

David

[Jeff Palmer]

Sounds like the mechanical setup is off some. Swash plate needs to be lowered by a couple of turns on each of the three rods and then the bell mixers reset to 0 degs. It is not uncommon to have to do this. Nothing wrong with the radio, just the mechanical setup needs adjusted in my opinion.

-10 to +12 = 22 degs of range. 50% of 22 = 1 deg positive.

David

Fixed, I rasied the swash plate a couple of turns and reset the bells, lowering the swash did not help,

Thanks David,

[DavidH]

Ok glad you got it fixed. I always leave the pitch curve in the radio set to the default settings. Then I set up the mechanical pitch curve without changing anything in the radio. Once I get everything setup correctly on the mechanical side. Then I can adjust it electronically how I want it.

David

[RCfan]

There ya go ... sometimes you need to take a few steps back and see the whole picture. ;) Actually, when you think about this and consider that the radio doesn't really have a clue what you're trying to control or where "mid-stick" should be positioned at ... it's really up to whomever setup the aircraft. Glad you got it worked out!!!

[Jeff Palmer]

and sometimes the rod length as per instruction are not right, just a ballpark....

[DavidH]

It only takes being off one turn on a couple of rods and that changes everything. I measure the rods with digital calipers when I build them. Sometimes I have to adjust them when installed, some of the time I don't touch them.

David