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Old Nov 20, 2012, 09:56 PM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
374 Posts
Hey everyone, I am using an align gp790 gyro for my tail.... the tail is mushy as hell.... I upped the gain so much but the tail overshoots on a quick stop and shakes on hard climbs and hard descents. I am using a spektrum H6080G Servo on the tail..... I have a gp780 here as well do you think I should try switching gyros? Or is there something on this heli I should look at that may cause this problem? Thanks.....
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Old Nov 20, 2012, 09:57 PM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
374 Posts
Oh, and with the gain turned all the way to 96% still no wag
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Old Nov 20, 2012, 11:01 PM
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New Smyrna Beach, FL
Joined Jun 2005
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What do you have for expo?
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Old Nov 21, 2012, 01:24 AM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
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Originally Posted by mligosh View Post
What do you have for expo?
does it matter what I have for expo? it's 100
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Old Nov 21, 2012, 08:03 AM
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I would suggest dropping the expo to something like 30% and then you can also lower that gain back down to a more reasonable startingpoint.

Mike
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Old Nov 21, 2012, 08:08 AM
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New Smyrna Beach, FL
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Expo softens the controls around neutral so at 100 percent you will have very little control deflection until you reach maximum stick deflection
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Old Nov 21, 2012, 08:56 AM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
374 Posts
Oh crap, what am I saying, my expo it's at 15 all around, not 100. Sorry about that
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Old Nov 21, 2012, 07:58 PM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
374 Posts
The tail slider is moving nice and smooth when not powered up, I changed the gyro and no change same thing. I powered it up, disconnected the servo control rod and tried moving the slider by hand and it is really hard to move... Is that normal when the motor is powered up? Centrifugal force trying to straighten the tail blade holders? I want to fix this but I am running out of ideas..... Thanks
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Old Nov 21, 2012, 08:31 PM
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Originally Posted by gs550t1981 View Post
The tail slider is moving nice and smooth when not powered up, I changed the gyro and no change same thing. I powered it up, disconnected the servo control rod and tried moving the slider by hand and it is really hard to move... Is that normal when the motor is powered up? Centrifugal force trying to straighten the tail blade holders? I want to fix this but I am running out of ideas..... Thanks
That sounds like you may have a bad bearing in the blade grips or the one-way bearing is not assembled with the plates in the right sequence.
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Old Nov 22, 2012, 12:24 AM
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United States, NY, Coram
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Originally Posted by rotoraddict View Post
That sounds like you may have a bad bearing in the blade grips or the one-way bearing is not assembled with the plates in the right sequence.
You said one way bearing not installed properly? I never had it apart. Or did you mean thrust bearing in the tail??? Thanks... I will take tail blade grips off tomorrrow to check them. I appreciate it.
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Old Nov 22, 2012, 01:33 AM
Beginner Pilot
United States, NY, Coram
Joined Jul 2012
374 Posts
I just took the tail blade grips off. They are just traditional bearings with a spacer in between, no thrust bearings...I noticed they were pretty loose. How tight should they be? I'm assuming until they bind than back off a hair? and what stops them from loosening up? I just want this figured out.... It has to be mechanical and not the gyro... I have to be overlooking something
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Old Nov 22, 2012, 12:00 PM
SUCK LESS
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United States, IL, Lombard
Joined May 2009
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Blue threadlock keeps the grip bolts from loosening up and flying out. The grips should rotate freely without any resistance. Those spacers are important - make sure both grips have them between the bearings. The used heli I bought was missing them (stressing the bearings when the bolt was tightened) and the grips/slider assembly was very hard to move - unflyable basically.
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Old Nov 28, 2012, 08:52 PM
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Originally Posted by FR4-Pilot View Post
Blue threadlock keeps the grip bolts from loosening up and flying out. The grips should rotate freely without any resistance. Those spacers are important - make sure both grips have them between the bearings. The used heli I bought was missing them (stressing the bearings when the bolt was tightened) and the grips/slider assembly was very hard to move - unflyable basically.
And I would bet the fellow you bought it from thought the Swift was not a good heli, when it was his assembly errors that werer at fault...had a similar occurance at our field this summer. The guy was badmouthing the heli every chance he got...when I checked his build and corrected a couple of errors, set it up properly, it flew like a champion.
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Old Nov 28, 2012, 11:33 PM
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United States, NY, Coram
Joined Jul 2012
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Yeah, I went over this heli again really good this time and found so many problems..... got some parts on order.... gonna fix it right this time and try it again.....
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Old Nov 28, 2012, 11:49 PM
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United States, IL, Lombard
Joined May 2009
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GyroMan - it was a very strange situation. The previous owner claimed ignorance to a lot of things that were wrong with the heli - blaming them on his previous owner. I don't think either of them knew how to properly build/setup/fix a heli - that thing was an explosion waiting to happen. If somebody else were to have bought it instead of me and actually spooled it up it would have been really, really bad. 6S, 1100kV and a 13T pinion, with McGuyver'd arms & pushrods in the head

gs550t1981 - What did you find ... do tell
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Last edited by FR4-Pilot; Nov 29, 2012 at 12:05 AM.
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