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Discus 2 rudder stiff help please



 
 
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  #11  
Old August 27th 19, 01:55 AM posted to rec.aviation.soaring
India November[_2_]
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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


Thanks to all for helpful comments. I did start using an overboard relief system this season using the factory-installed tube. This is #1 suspect. Next step...take the rudder off with my AME's help.
Ian IN


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  #12  
Old August 27th 19, 03:29 AM posted to rec.aviation.soaring
Dave Nadler
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Default Discus 2 rudder stiff help please

On Monday, August 26, 2019 at 8:55:09 PM UTC-4, India November 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...

...I did start using an overboard relief system this season using
the factory-installed tube. This is #1 suspect.


Ian, Obviously, you need a Mark VIII:
https://www.youtube.com/watch?v=QEJJb_ufo8A

Make sure you pull rudder, deal with any corrosion and bushing wear,
and for heavens sake use proper grease and not WD-40 when re-installing.
  #13  
Old August 27th 19, 06:24 AM posted to rec.aviation.soaring
[email protected]
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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


If you are using the factory pee system, it will corrode the rudder horns. removing the rudder is easy as are the repairs and have been explained in other text. When you disconnect the rudder cables, be sure to attach a section of safety wire as the cables are spring loaded and may retract into the fus which will make retrieval of the cables difficult.
  #14  
Old August 27th 19, 01:17 PM posted to rec.aviation.soaring
India November[_2_]
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Default Discus 2 rudder stiff help please

I had heard of corrosion issues from Dave Nadler et al and was closely watching the visible rudder horns and cable ends. I didn't imagine the internal parts could be affected first. We'll see when I get the rudder off. Good point about attaching safety wire. The cable ends retracted about 3 inches inside the fuselage when I removed the bolts.
Ian
  #15  
Old August 27th 19, 01:40 PM posted to rec.aviation.soaring
Dave Nadler
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Default Discus 2 rudder stiff help please

On Tuesday, August 27, 2019 at 1:24:06 AM UTC-4, wrote:
When you disconnect the rudder cables, be sure to attach a section
of safety wire as the cables are spring loaded and may retract into
the fus which will make retrieval of the cables difficult.


Really now, don't go spoiling the entertainment value for onlookers...
  #16  
Old August 27th 19, 01:41 PM posted to rec.aviation.soaring
Dave Nadler
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Default Discus 2 rudder stiff help please

On Tuesday, August 27, 2019 at 8:17:45 AM UTC-4, India November wrote:
I had heard of corrosion issues from Dave Nadler et al...
I didn't imagine the internal parts could be affected...


Ian, internal corrosion is shown in the video:
https://www.youtube.com/watch?v=QEJJb_ufo8A
  #17  
Old August 27th 19, 03:06 PM posted to rec.aviation.soaring
[email protected]
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Default Discus 2 rudder stiff help please

Better than that, bungee the rudder pedals back and relieve spring pressure and way easier to remove and replace the bolts holding the cables.
  #18  
Old August 27th 19, 08:04 PM posted to rec.aviation.soaring
[email protected][_2_]
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Default Discus 2 rudder stiff help please

Better
Use string on the cable, when installing, pull string to position cable...drop in bolt....razor knife string.
No untying, unwinding, wires in the way.
Attach string first before removing bolt.
R
  #19  
Old August 27th 19, 09:49 PM posted to rec.aviation.soaring
rudolph stutzmann
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Default Discus 2 rudder stiff help please

On Tuesday, August 27, 2019 at 8:41:54 AM UTC-4, Dave Nadler wrote:
On Tuesday, August 27, 2019 at 8:17:45 AM UTC-4, India November wrote:
I had heard of corrosion issues from Dave Nadler et al...
I didn't imagine the internal parts could be affected...


Ian, internal corrosion is shown in the video:
https://www.youtube.com/watch?v=QEJJb_ufo8A


With our ships relief tube system, we have the tube that extends approx. 18" out the bottom of the ship; when using I bank and try to keep about 30 degrees of slip on the yaw string, hoping to keep everything clear of the fuselage....
  #20  
Old August 28th 19, 03:17 PM posted to rec.aviation.soaring
Karl Striedieck[_2_]
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Default Discus 2 rudder stiff help please

Situations like this can be avoided if the annual inspections are done properly. Both the rudder and the seat pan must be removed to catch problems. When I was the dealer for a German company years ago I and the company were sued for a fatal crash where the flight controls under the seat pan were compromised. This happened because water had puddled under the seat pan and the ship was parked in a hangar with the tail elevated. The seat pan had never been removed.

Regarding rudder hinges, they are prone to corrosion from wing water dumping, flying through rain, tail ballast dumping and, especially, urine contamination. A friend had to replace the lower rudder hinge in his D2 due to corrosion.

Removing the rudder and seat pan annually is a must.

KS
 




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