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HelicopterThunder TigerOther › Yo Yo syndrome
10-08-2005 03:38 AM  12 years agoPost 1
lorenkb

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Seattle, Washington

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Hey guys

I put on a Top Dragon metal head on my Raptor 50 the other week (light version). I have just now gotten around to doing final adjustments and a test flight. I also put in a metal washout assembly and flybar cage at the same time.

Problem is that with the new head, the controls "lag" behind the input. This manifests itself in me over-correcting, and Yo-Yo syndrome soon follows The head is a bit stiff compared to the stock head (had that one smooth as silk), but I don't think this contributes all that much.

I've double and triple checked my linkages and arms, and I can't find anything wrong. Am I overlooking anything obvious? Is it possible that the thrust bearings have to be reversed in the TDG head due to the different bearing arrangement?

I'll try to get some pics over the weekend. I'm hoping I'm just overlooking the obvious...

Loren

Between Helis and Computers I'm broke. But hey, my computer can kick your computer's a$$

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10-08-2005 04:41 AM  12 years agoPost 2
Spin City

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10-08-2005 07:16 AM  12 years agoPost 3
lorenkb

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Seattle, Washington

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Servo is a 9252, so I think I'm covered on that base.

I'll have to take another look to make sure its not binding under load. I did notice that the blade grips seemed to have a tad of play in them that I can't remember being there in the stock head.

Epic weather... yeah! I actually went out to the feild last Saturday and flew around 6 PM or so at Marymoor. It was getting dark, raining, and lightning off to the side of the field (closest strike was a mile off). Rain looks so cool when it hits the rotor-disk. Whish I had brought a camera along...

Loren

Between Helis and Computers I'm broke. But hey, my computer can kick your computer's a$$

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10-08-2005 10:41 AM  12 years agoPost 4
Fifer

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Fife Scotland

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Should be no probs with the head, I had one fitted for over a year and all I feelt with the new head is a lot more control.
You can see the pic in my gallery it`s fitted to my R50.................

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10-09-2005 03:18 AM  12 years agoPost 5
pcliftonjr

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Phoenix, AZ

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If it's happening on fore/aft cyclic...check the double balls on the elevator arm. I've had this problem on my 90 for a bit and I couldn't find the source until today. The outer ball was loose.

I finally found a reason for the Push/Pull upgrade !

Paul

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10-09-2005 03:40 AM  12 years agoPost 6
Spin City

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10-09-2005 03:42 AM  12 years agoPost 7
Twobeers

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Toronto, Canada

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Did you lube the head dampers?

I lost my infamous tag line.

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10-09-2005 03:56 AM  12 years agoPost 8
Spin City

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10-09-2005 07:28 AM  12 years agoPost 9
HotsHabit

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Idaho

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Is it possible that you have misaligned the washout holding pins and basically changed the phase of the head? Picture below shows the part I am talking about, it seems if this were not aligned properly that the inputs to the head would be altered.

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10-09-2005 11:46 AM  12 years agoPost 10
lorenkb

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Seattle, Washington

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Thanks for the input guys

I should clarify that the cyclis seems to be unaffected. Only collective lags. Phasing ring is adjusted properly.

I sure hope its not the collective servo... Bad gears wouldn't be so bad, but if its worse than that I just don't have the money right now to fix it.

I'm running a governor right now, so headspeed should be a constant 1900 or so.

When I get the time I'll start eliminating variables one by one. Right now I'm swamped with school and research projects.

Loren

Spin City: It might just be my ham-fisted flying yet! After half a tank of flying I had adjusted my inputs to compensate for the Yo Yo, but throttle hold landings were another thing... bounce bounce...

Between Helis and Computers I'm broke. But hey, my computer can kick your computer's a$$

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10-10-2005 03:41 AM  12 years agoPost 11
Spin City

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10-10-2005 05:41 AM  12 years agoPost 12
lorenkb

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Seattle, Washington

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Nope, no flying for me, and probably won't be for months...

I spent all day working on a $17,000 3D modeling software package. For such an expensive tool you'd think the developers would do extensive bug testing... but then you'd be wrong. Next up is a Resume, working with our new departmentental Structures Prof, studying for the GRE...and on and on....

I'll go back and check my curves, but they should be A-OK. I'm guessing that I'm getting a fair amount of binding.

Loren

Between Helis and Computers I'm broke. But hey, my computer can kick your computer's a$$

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10-10-2005 06:59 AM  12 years agoPost 13
Spin City

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