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Home✈️Aircraft🚁HelicopterBeginners Corner › Loss of level swash in moving through full range.
02-26-2010 06:45 PM  10 years ago
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dicharry

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Franklinton, LA

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Loss of level swash in moving through full range.
This is something I haven't encountered before in setting up my helis.
On my Gaui 200, as I move the collective in idle up or normal through the full range, it will start off level and as it moves up the mainshaft, the elevator servo begins to move the swash about 25 degrees forward. It's as if the elevator servo out paces the aileron and pitch servos. I have tried correcting the elevator by using the swash E menu without sucess, and then trying E EPA adjustments without success.
The only thing I haven't tried is using another GWS pico + servo identical to the ones on A and P. Maybe I should move the E ball closer in on the servo horn ? There's probably a simple solution, but in the meantime, I'm in the dark.
Thanks,
Don
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02-26-2010 06:53 PM  10 years ago
Git

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Brunei

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you said u tried adjusting the EPA? hmm..

what exactly did u do to the EPA? did u increase E EPA? that normally does the trick.. if its maxed out already (not very likely tho), reduce both the A n P EPA equal amounts til swash is level at the top.

swash E menu wont do anyting cept increase or decrease the throw for the given stick deflection.
Alees Rush 750
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02-26-2010 10:11 PM  10 years ago
dicharry

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Franklinton, LA

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Got it Git Thanks
Will try resetting E swash menu to where it was before and return to E
EPA, making adjustments, and let you know where I stand later on tonight or tomorrow am. Previously I had tried adjusting the E epa both ways and trying the collective after increasing and then after decreasing the value.
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02-27-2010 12:25 PM  10 years ago
rotormonkey

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Ottawa, ON - Canada

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This is actually pretty common on ccpm helis. The easiest way to do it is to just drop the collective to bottom, and play with the epa until you can see it go level, then put the stick to the top and do the same.

Like Git said though, you were on the right track with endpoint adjustments.
If it can't hover, it ain't worth flying.
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02-27-2010 05:22 PM  10 years ago
dicharry

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Franklinton, LA

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I've got a strange situation here. Using my Eclipse 7 radio with spectrum module, I have tried all kinds of adjustments on ele EPA, tried readjusting the ele servo arm and ball, and the best I can get is a moderatley level swash through the full range in Normal mode, but when I flip to Idle Up (position 1 or 2 idle up) the elevator servo arm drops down about 25degrees causing the swash to orient level in roll and back in pitch.
Now, here's the real puzzle for me. I have a Gaui MZP 2 100 size collective pitch heli that's set up on my Futaba 6Exhp radio. Both radios are on Ch 59. By some stroke of luck, when I tried the Futaba radio with the Gaui 200 everything worked as it should. Just dumb luck that nothing had to be changed with the exception of the gyro gain. Using the Futaba radio, the swash plate was level in normal or idle up through the full range AND flipping the Idle Up swith did not result in the elevator servo dropping down. I copied all setup info from the Futaba and transposed it to the Hitec Eclipse 7, but that did not rectify the situation. It looks like I've got an all or none situation with the eclipse radio/Gaui 200. I can adjust it to fly in normal mode with the swash operating close to level through the full range. There is no switching to idle up without the swash dropping down in back.
The other possibility is to switch to idle up, adjust the servo arm up, and then all is well, but you can't switch to normal mode without the swash going way out of adjustment. Of course, taking off and flying from the idle up mode might be a challenge I'm not ready for.
For now, I'm going have to be content to use the Futaba radio for both the MZP 2 and the Gaui 200.
Thanks,
Don
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02-27-2010 11:27 PM  10 years ago
rotormonkey

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Ottawa, ON - Canada

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Sounds odd that only one servo would behave differently from one flight mode to the next. Is there some program mix in your radio you have enabled that you didn't realize?

Also if the arm moves down the further it is from center, how did you fix it mechanically if it's the servo arm that moves too much? I'm having trouble visualizing what's going on here.

Maybe a video would help? Or better still if there's any heli guys in your area (even the LHS) they might be able to get you sorted easier if they can see what's going on?
If it can't hover, it ain't worth flying.
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02-28-2010 03:07 AM  10 years ago
gftazz

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upstate N.Y. in the Adirondacks

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You've got something activated.
You've probably got some TRIM activated that is kicking in when you flip the idle up switch. On some radios it's seperated in all flight modes and or you can GANG it so it's on all the time effecting all flight modes. In other words you can trim for each flight mode differently. Look on the trims on the radio and when you flip the idle up switch see if it shows a change.
Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!
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03-02-2010 12:24 PM  10 years ago
dicharry

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Franklinton, LA

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Checked the trims in all flight modes and they are all set at 0%. The elevator servo arm continues to drop down when I switch to Idle Up 1 or Idle Up 2. There is no change in the servo arm from Idle Up 1, when it drops down, to Idle Up 2. It maintains the dropped down position.
I tried switching channel 1 and 6 and results were the same.
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03-03-2010 03:50 AM  10 years ago
raptor4ever

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RayoVac IS A THEIF!!!!

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IS your pitch curve out a hair on idle ups make sure your points havent moved
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03-03-2010 05:13 AM  10 years ago
dougly

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spokane wash

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swash movement
Did you check your travel adjustment. Just make sure that the three servos on the collective travel the same percentage.
Doug McKenzie Flying high,fun,and fast
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03-03-2010 01:16 PM  10 years ago
dicharry

rrApprentice

Franklinton, LA

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For the sake of simplicity the collective servos are all set at 100% EPA and 0 trim in every flight mode. All servos are identical GWS Pico F+ BBs. All Mixes are INH or 0.
I, like others, think I must have some EPA or TRIM differences between my Idle Up and/or flight conditions. I've reread the manual on flight modes and flight conditions thinking that HAD TO BE the answer.
I'm running out of options now. I'm so irked with this Eclipse 7, that I just ordered a Futaba 7C TX. I will be sticking with Futaba from now on.
Thanks for the help and suggestions,
Don
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