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#41
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Crunch Alert (USA) - hugely serious but (apparently) non-fatal
The tension springs are an essential part of the control circuit to avoid flutter. Inspection of cables where they go through the adjustment guides is a standard item on inspection check lists. It might be smart for everybody to adjust their pedals all the way forward and back and see if the guy who did our inspection nissed something. UH Not sure that flutter is the reason for the springs. They are necessary to to tension the cables when the rudder pedals are moved for and aft on some gliders. Some gliders do not have springs in the cable at all |
#42
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Quote:
In the accident of the JS1, the glider was in a right hand slip (full left aileron required). We can assume in this case that the left hand rudder cable broke. In the accident photo’s the right hand cable is off, which probably happened during impact. |
#43
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Crunch Alert (USA) - hugely serious but (apparently) non-fatal
On 5/10/2012 6:32 AM, Martin RSA wrote:[color=blue][i]
Ramy;814097 Wrote: Renny wrote: Wow, thank god it happened at altitude! Isn't it that virtually all our rudder pedals mechanism are spring loaded, and if one cable breaks the result is instantaneously full rudder? I always thought this is a receipt for disaster. A glider without rudder control may still be flyable and even landable, but not with full rudder! Ramy This is sort of true, but not in this case. The spring is just strong enough to ensure the pedal does not fall forward when the pilot climbs out. Also, if one spring is off, it is not strong enough to allow yaw to initiate. In the accident of the JS1, the glider was in a right hand slip (full left aileron required). We can assume in this case that the left hand rudder cable broke. In the accident photo’s the right hand cable is off, which probably happened during impact. Are the accident photos online? |
#44
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Quote:
In January 2009 a Lak 12 had a rudder cable break while flying at Omarama. The pilot in this case had the rudder go over but was able to maintain a slipping turn down to a landout. Glider was crunched in a fence but pilot walked away. It would appear the rudder will go over and if you resort to a slipping turn the rudder will stream more to the side the spring is pulling it towards Last edited by Ventus_a : May 10th 12 at 10:12 PM. |
#45
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[quote=Greg Arnold;
Are the accident photos online?[/QUOTE] Not that I am aware of |
#46
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snip
It would appear the rudder will go over and if you resort to a slipping turn the rudder will stream more to the side the spring is pulling it towards[/quote] Further to my earlier post, an excerpt from a Derek Piggot article primarily about the Janus C that makes interesting reading |
#47
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Crunch Alert (USA) - hugely serious but (apparently) non-fatal
On May 10, 7:32*am, Martin RSA joburgatgeerlingsdotcodotza wrote:[color=blue][i]
Ramy;814097 Wrote: Renny wrote: Wow, thank god it happened at altitude! Isn't it that virtually all our rudder pedals mechanism are spring loaded, and if one cable breaks the result is instantaneously full rudder? I always thought this is a receipt for disaster. A glider without rudder control may still be flyable and even landable, but not with full rudder! Ramy This is sort of true, but not in this case. The spring is just strong enough to ensure the pedal does not fall forward when the pilot climbs out. Also, if one spring is off, it is not strong enough to allow yaw to initiate. In the accident of the JS1, the glider was in a right hand slip (full left aileron required). We can assume in this case that the left hand rudder cable broke. In the accident photo’s the right hand cable is off, which probably happened during impact. -- Martin RSA Saw the photos yesterday. Also inspected the sister ship of the JS1 that had a rudder cable failure at 100 hours. The sister ship has 28 hours and the right rudder cable is beginning to fray with several strands already worn through due to contact with the sharp edge of the S tube. |
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