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Home✈️Aircraft🚁HelicopterThunder TigerOther › Raptor 60 Wobble With TDG Metal Head & Grips Fitted
09-04-2006 05:54 AM  14 years ago
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Gazzer

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Hope Valley, UK

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Raptor 60 Wobble With TDG Metal Head & Grips Fitted
Hope somebody can give some advice on a wobble problem I'm having with my Raptor 60/OS70 . I bought used (Ebay) a TDG or Top Dragon Model head and grips along with hardened steel shaft and metal swash. Here's the head for reference

Now problem I have is a wobble that seems to be intermitant. Some flights OK others bad. I've tried to increase head speed, problem seems to go away but then returns. I've tried different main shaft, changing from TDG damper to standard TT damper, lubrication, nothing seems to work. I should add that everything seems balanced and smooth. The head fit on the main shaft is tight (tighter than the standard TT head).

I have done a search and found a few posts that seem to report similar 'wobble' but never any conclusion as to what if anything solved the problem! Any advice
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09-04-2006 07:15 AM  14 years ago
Andrew_S

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Gaston, South Carolina

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Did the problem start after u changed to the metal head? How bout the spindle, is it bent? Maybe the ball screws are bent.Drewskie

www.congareeflyersinc.com
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09-04-2006 07:46 AM  14 years ago
Gazzer

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Yes, problem only started after I changed the head. I have tried changing spindle to the original unit also. Not sure what you mean by the "ball screws" ?
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09-04-2006 09:07 AM  14 years ago
Temjin

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Walnut CA, HsinChu Taiwan

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The head is probably not balanced.

Life is short. Offend as many people as you can. - Tom Leykis
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09-04-2006 09:14 AM  14 years ago
Gazzer

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Hope Valley, UK

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By not balanced you mean not made correctly? Not anything I can correct ? Actually I would think anything being 'out of balance' on the head would lead to a constant vibration where as what I see is an intermitant wobble. The tail is rock solid, no bobbing or vibration there ....... just this damned wobble (don't know how else to describe it )
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09-04-2006 01:19 PM  14 years ago
NORTHERNLIGHTS

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Riverview FL

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you mention trying a higher headspeed. Then it returns. Does it return after you lower headspeed, or is it present with the higher headspeed?B.O.A.T. Break Out Another Thousand!
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09-04-2006 01:34 PM  14 years ago
Gazzer

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Hope Valley, UK

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I set a higher head speed at hover. At first you think problem is gone but next flight its back at the same settings. Basically problem seems to can occur at any head speed. Really weird!
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09-04-2006 02:19 PM  14 years ago
marlin847

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Pelion SC USA

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What is your head speed? I am flying a Raptor 60 with a OS 70 and a team Futaba Rep that flys Raptors says my head speed should be 1900. Tach it and set to 1900 it will go away. Mine wobble went away.
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09-04-2006 02:22 PM  14 years ago
Professorwiz

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Livonia, Michigan - USA

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I've heard misinstalling the thrust bearings in the grips can lead to odd problems. Have you double checked to make sure the small hole race is on the inside?
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09-04-2006 04:12 PM  14 years ago
Gazzer

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Hope Valley, UK

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What is your head speed? I am flying a Raptor 60 with a OS 70 and a team Futaba Rep that flys Raptors says my head speed should be 1900. Tach it and set to 1900 it will go away. Mine wobble went away.
I think we measured something like 1600-1700 last weekend. OK will give 1900 a try and see what happens, thanks
I've heard misinstalling the thrust bearings in the grips can lead to odd problems. Have you double checked to make sure the small hole race is on the inside?
Mmmmmmm now you've got me thinking. I remember checking that the the bearings were in the correct place but not that the thrust bearing could be installed the wrong way round ..... I'd better double check this ....... you could be right
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09-05-2006 12:28 AM  14 years ago
marlin847

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Pelion SC USA

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you will like the 1900 better. It flys with more authority. You should also have pitchs set to 10/10. When you set rpm up wobble goes away and autos are real nice with that head speed. Now the titan 50SE has a head speed of 2100 now thats cooking with some oil. Marlin
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09-05-2006 12:46 AM  14 years ago
mnewhook

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Newfoundland, Canada

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I don't think it should be necessary to run at 1900 to get rid of the wobble. Did the stock head wobble at 1700? You'll get a shorter runtime at that head speed, and the heli will be much more twitchy and less forgiving.

2100 That's a bit fast -- even for me
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09-05-2006 04:02 AM  14 years ago
Gazzer

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Hope Valley, UK

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Yeah .... I kind of see running at very high head speeds (at least for me) may mask the wobble problem but not really find the solution. I'm kind of hopefull that it's the thrust bearings installed the wrong way round ..... I really forgot that there was a bigger and smaller diameter so it likely is wrong That being said however, the head was assembled when I got it and the wobble was apparent then so it would mean the previous owner also got it wrong

It may just be that the head is badly made. I have recieved one PM which casts some doubts on the quality of these head blocks I'm hopping not but .............

marlin847 : You say you had the wobble problem ... what head block are/were you using?
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09-05-2006 04:10 AM  14 years ago
Slowpoke

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Dublin, OH

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Gazzer,

I had the exact same TDG headblock and grips on my Raptor 60, and had the same wobble, the tail would bounce up and down. I ran my headspeed between 1600 and 1750, and as you said, sometimes it would wobble and sometimes it wouldn't, but more often than not. I put the stock headblock back on and no wobble.
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09-05-2006 06:47 AM  14 years ago
Linley

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Rockville Centre - LongIsland, New York

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TDG Head Problem
Had the exact problem and returned it for another one. 2nd one had the same wobble problem. Returned that one and got my money back and purchased the Thunder Tiger Metal Rotor Head. Problems Gone!
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09-05-2006 08:44 AM  14 years ago
Rbush

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here

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I bought a new TDG head for my TT50 when Heli Addicts imported them. I had the same problem. I tried EVERYTHING, nothing worked until they replaced it with a new one.

It was great then.

3 other mates had one after that, they all worked well as well ( I set them all up the same way )

It does seem that the odd one is bad for some reason. Maybe that's why it was sold on Ebay ??
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09-05-2006 09:12 AM  14 years ago
Gazzer

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Hope Valley, UK

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Thanks for the reports guys. It is looking like just a poor quality unit then. Could well be why is was being sold on Ebay, the guy seemed genuine enough, seemed to be well into the hobby with a few heli's ..... ah well ...that's the danger of Ebay I guess, you pays your money you takes your chances .........now where did I leave my credit card !
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09-18-2006 05:30 AM  14 years ago
Gazzer

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Hope Valley, UK

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Just to post "an end" to this thread.

Turns out the problem was the thrust bearings were not installed correctly Previous owner must have had the same problem! Eveything working well now.

Would also add that I contacted the manufacturer on the problem. They were very helpfull and offered to test the head for me. If they found a problem they would send a new one ........ can't say fairer than that
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09-18-2006 10:34 AM  14 years ago
Saleh

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Kuwait

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I had the same issue with my 50 when i installed the mavrik head try changing tha damps have somthing softer with higher head speedIf you aint crashing you aint flyin
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