A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Soaring
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Discus 2 rudder stiff help please



 
 
Thread Tools Display Modes
  #1  
Old August 26th 19, 12:55 PM posted to rec.aviation.soaring
India November[_2_]
external usenet poster
 
Posts: 19
Default Discus 2 rudder stiff help please

The rudder on my D2b has become very stiff on its hinges during this season.. I disconnected the cables at the rudder horn, and it's clear the problem is in the rudder not elsewhere in the control circuit. Removed mylar seals without effect. No visible damage to the rudder, and no foreign objects visible between rudder and fin. Before I remove the rudder, has anyone out there encountered a similar problem? Glider has 650hrs TT, always hangared.

Thanks in advance for all suggestions!
Ian IN
Ads
  #2  
Old August 26th 19, 02:30 PM posted to rec.aviation.soaring
Tim Taylor
external usenet poster
 
Posts: 743
Default Discus 2 rudder stiff help please

On Monday, August 26, 2019 at 5:55:09 AM UTC-6, India November wrote:
The rudder on my D2b has become very stiff on its hinges during this season. I disconnected the cables at the rudder horn, and it's clear the problem is in the rudder not elsewhere in the control circuit. Removed mylar seals without effect. No visible damage to the rudder, and no foreign objects visible between rudder and fin. Before I remove the rudder, has anyone out there encountered a similar problem? Glider has 650hrs TT, always hangared.

Thanks in advance for all suggestions!
Ian IN


The rudder rides on two surfaces that you could try to lube without removing the rudder. A lubricant with an extension nozzle should reach both. That said,
the rudder is relatively easy to remove (one nut). It is probably a good idea to remove it and clean the hinge points properly.
  #3  
Old August 26th 19, 02:47 PM posted to rec.aviation.soaring
Bravo 8
external usenet poster
 
Posts: 1
Default Discus 2 rudder stiff help please

On Monday, August 26, 2019 at 7:55:09 AM UTC-4, India November wrote:
The rudder on my D2b has become very stiff on its hinges during this season. I disconnected the cables at the rudder horn, and it's clear the problem is in the rudder not elsewhere in the control circuit. Removed mylar seals without effect. No visible damage to the rudder, and no foreign objects visible between rudder and fin. Before I remove the rudder, has anyone out there encountered a similar problem? Glider has 650hrs TT, always hangared.

Thanks in advance for all suggestions!
Ian IN


I've got an ASW19B with a similar issue. I've adjusted the nut at the bottom of the rudder with no affect. I too would appreciate any suggestions. And thanks!
  #4  
Old August 26th 19, 03:05 PM posted to rec.aviation.soaring
[email protected]
external usenet poster
 
Posts: 394
Default Discus 2 rudder stiff help please

Is the gap between the rudder and fin skin OK? Check it by sliding 80 grit sandpaper in the gap with smooth side towards the rudder. Run it all the way up and down on both sides, all gaps should be free, sand till it is.Spray lube both hinge points.
JJ
  #5  
Old August 26th 19, 03:06 PM posted to rec.aviation.soaring
[email protected]
external usenet poster
 
Posts: 106
Default Discus 2 rudder stiff help please

Do you use an overboard type relief system?
  #6  
Old August 26th 19, 04:33 PM posted to rec.aviation.soaring
Eric Munk
external usenet poster
 
Posts: 176
Default Discus 2 rudder stiff help please

At 14:06 26 August 2019, wrote:
Do you use an overboard type relief system?

If so, corrosion in the lower rudder hinge usually is the culprit.

  #7  
Old August 26th 19, 04:51 PM posted to rec.aviation.soaring
Mike the Strike
external usenet poster
 
Posts: 945
Default Discus 2 rudder stiff help please

Agree, hinges are the most likely problem. Definitely worth removal for an inspection of any possible damage from corrosion. If OK, clean and lube should fix.

Mike
  #8  
Old August 26th 19, 04:56 PM posted to rec.aviation.soaring
Craig Funston[_3_]
external usenet poster
 
Posts: 125
Default Discus 2 rudder stiff help please

On Monday, August 26, 2019 at 7:05:05 AM UTC-7, wrote:
Is the gap between the rudder and fin skin OK? Check it by sliding 80 grit sandpaper in the gap with smooth side towards the rudder. Run it all the way up and down on both sides, all gaps should be free, sand till it is.Spray lube both hinge points.
JJ


JJ, it's likely there are "V" seals in addition to the standard mylar seals.. Running sandpaper in the gap will likely destroy those seals.

Ian, the rudder comes off fairly easily with just removal of a single nut at the bottom of the rudder. I haven't looked specifically at the Discus, but if it's like all the other SH aircraft I've worked on, there's a castellated nut secured by a cotter pin. The cotter pin can be accessed by pushing the rudder to full deflection. Once the nut is off the rudder can be shifted upward and it will come off the hinge pins. It's helpful to remove the rudder cables first.

It may be time for new V-seals or cleaning and lubrication of the plain bearings. There's no mechanical reason why it should be stiff.

Hope all goes well. If there's any question, get it to an aircraft mechanic for some help.

Cheers,
Craig
  #9  
Old August 26th 19, 06:15 PM posted to rec.aviation.soaring
krasw
external usenet poster
 
Posts: 614
Default Discus 2 rudder stiff help please

On Monday, 26 August 2019 16:47:27 UTC+3, Bravo 8 wrote:
On Monday, August 26, 2019 at 7:55:09 AM UTC-4, India November wrote:
The rudder on my D2b has become very stiff on its hinges during this season. I disconnected the cables at the rudder horn, and it's clear the problem is in the rudder not elsewhere in the control circuit. Removed mylar seals without effect. No visible damage to the rudder, and no foreign objects visible between rudder and fin. Before I remove the rudder, has anyone out there encountered a similar problem? Glider has 650hrs TT, always hangared.

Thanks in advance for all suggestions!
Ian IN


I've got an ASW19B with a similar issue. I've adjusted the nut at the bottom of the rudder with no affect. I too would appreciate any suggestions. And thanks!


There is a brass bushing inside lower hinge. This has worn short over time. You notice this by tightening the lower nut, rudder has no vertical play anymore and bolt is crushing the hinge. Replace brass bushing and you are good to go. Note, rudder must ALWAYS have vertical play, even when nut is tight. If there is no play, bushing is not doing it's job.
  #10  
Old August 26th 19, 09:25 PM posted to rec.aviation.soaring
Charlie M. (UH & 002 owner/pilot)
external usenet poster
 
Posts: 1,346
Default Discus 2 rudder stiff help please

Totally agree....
Minor bit....as swiping the coarse sandpaper between rudder and fin, move rudder maybe 20* and try again.
Do NOT assume the front radius on the rudder is constant....... may be fine in spots, my bind in others.
Yes, sounds like check binding between rudder and fin....if OK.....pull rudder, clean stuff (WD-40 can work here), lube and go from there...
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Discus Rudder Pedal Adjustment [email protected] Soaring 3 February 26th 16 05:11 PM
PW-5 PW-6 'stiff' rudder pedals son_of_flubber Soaring 9 July 26th 12 07:46 PM
Stiff rudder Steve Freeman Soaring 8 April 16th 09 01:57 AM
Discus CS and Duo Discus Wing Inspections Nolaminar Soaring 0 October 24th 03 01:15 AM
[LBA] Schempp-Hirth - Discus bT - Discus Frederic FUCHS Soaring 0 September 17th 03 08:42 AM


All times are GMT +1. The time now is 04:28 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright 2004-2020 AviationBanter.
The comments are property of their posters.