flag8r

Ok...I've put a longer servo arm on the collective servo, the swash moves almost the entire length of the shaft now. Getting zero pitch at mid stick, +9 degrees postive at high. The issue is I'm getting around -15 at low collective!
What do I do to correct this?

The swash is level, all arms are level.

AirmanBob

My Feedback: (14)

Don't know what radio you have but on mine (Futaba 6exh)
I would go into the EPA menu and adjust it.

Stick all the way down....set end point for negative
Stick all the way up........set end point for Positive

That work?

Bob

mrasmm

usually you just adjust your pitch links appropriately (the ones that hook the blades to the flybar). i dunno if they would be able to make up 4 or 5 degrees of difference though, but they should help a bit.

osterizer

Actually, the general adjustment is for two objectives-- pitch volume to have the total range (18 degrees - swash AFR on Futaba radios) that you want, then adjust the volume and pitch links (both servo-to-swash and swash-to-mixer arms) to have the center of the range at zero pitch. This is the most time-consuming adjustment for me.

AirmanBob

My Feedback: (14)

Well actually, he PM'd me and said he tried my fix
and it worked perfect.

Actually that's what computer radios do best. They
let you go in and adjust things. Of course you still
have to have a properly assembled heli to start
with.

Bob

osterizer

Sorry, Bob, but setting these using the EPA will put interaction in so the heli doesn't stay straight in maneuvers. It will work for hovering, but for flight it's just frustrating.

AirmanBob

My Feedback: (14)

OH, well shucks....

I wonder what the EPA adjustments are for then if they cause
interaction?

Thanks for the heads up.

Bob

osterizer

Np, man. the EPA is most useful on airplanes. Most places you'll go (incl. Futaba) will advise to keep the EPA as near 100% as possible, mechanically center the servos, and use the mixing (CCPM) adjustments to set the range around center. I think it was Jason Krause's web site that took it even further, advising against taking the limits too low on the gyro, either; in that setting, the reduced resolution can make the tail servo work harder and shortens its life. I haven't tried that one out (burning up a servo by cutting the gyro limits down, that is), I just follow the advice since it's cheap .

AirmanBob

My Feedback: (14)

Osterizer

Yeah.... I know what you're saying.

I keep my gyro turned up too. (gy240)

AB