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nigel_graham(at)m-tecque.
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 Posted: Wed Jan 04, 2012 1:13 pm Post subject: Exhaust safety wire |
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Graeme,
See the attached photo for a good way to safety wire the exhaust springs. This is how the CSA Sport Cruiser boys do it.
Nigel BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px; }
On 03/01/2012 21:49, graeme bird wrote: | Quote: | | Quote: |
During 'shake down' flights we twice lost an exhaust spring, both front, left then right, whether snapped or shaken loose, who knows. New engine, new springs, new exhaust - why should this be? Applied with a string not pliers, Anyone else had this? now wire locking but need more hours to see what happens.
Maybe its the stiffness of the new engine creating lots of movement on startup?
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Warp drive FP
Just Test Flying to obtain permit
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rholder(at)avnet.co.uk
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| Posted: Wed Jan 04, 2012 1:35 pm Post subject: Exhaust safety wire |
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On 04/01/2012 21:06, Nigel Graham wrote:
| Quote: | Graeme,
See the attached photo for a good way to safety wire the
exhaust springs. This is how the CSA Sport Cruiser boys do it.
Nigel
|
One of the reasons this spring as shown needs a safety
wire is that the spring is on the wrong way round. The
openings face the lugs. So that it is easier to get the
spring on, and easier for it to jump off.
All my springs are put on the harder way with the spring
end openings away from the lug.
my 2 penny worth
Richard Holder
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grahamsingleton(at)btinte
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| Posted: Wed Jan 04, 2012 1:55 pm Post subject: Exhaust safety wire |
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Nigel
I haven't seen many of these exhaust systems so I don't know how many have sheet stainless lugs compared to wire lugs.
The sheet metal tabs do tend to wear the springs unless de burred. Sorry but no pix
Graham
From: Nigel Graham <nigel_graham(at)m-tecque.co.uk>
To: europa-list(at)matronics.com
Sent: Wednesday, 4 January 2012, 21:06
Subject: Exhaust safety wire
Graeme,
See the attached photo for a good way to safety wire the exhaust springs. This is how the CSA Sport Cruiser boys do it.
Nigel #yiv1362994287 BODY {font-family:Arial, Helvetica, sans-serif;font-size:12px;}
On 03/01/2012 21:49, graeme bird wrote:
[quote] | Quote: | --> Europa-List message posted by: "graeme bird" <graeme(at)gdbmk.co.uk>
During 'shake down' flights we twice lost an exhaust spring, both front, left then right, whether snapped or shaken loose, who knows. New engine, new springs, new exhaust - why should this be? Applied with a string not pliers, Anyone else had this? now wire locking but need more hours to see what happens.
Maybe its the stiffness of the new engine creating lots of movement on startup?
--------
Graeme Bird
G-UMPY
Mono Classic/XS FWFD 912ULS/Warp drive FP
Just Test Flying to obtain permit
|
[b]
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nigel_graham(at)m-tecque.
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| Posted: Thu Jan 05, 2012 12:52 am Post subject: Exhaust safety wire |
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Richard,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
An excellent 2 penny’s worth!
The purpose of the safety wire is to limit the extension of the spring, preventing it opening sufficiently to allow it jump off the lugs. If done correctly, the spring should not be able to escape, no matter which way round it is assembled (unless something breaks). As with so many things, it is better to address the cause of the problem rather than the symptoms. It is the violent opening and closing of the exhaust expansion joint that is probably responsible for the spring “jumping” off. Assuming that the ignition is timed correctly and the carburettors are balanced, this will only occur when the Rotax shakes its head during start-up, and to a lesser degree during shut-down. I would hazard a guess that the true solution to the problem would be Mark Burton’s excellent “Soft Start” module.
Nigel
On Wed 04/01/12 21:28 , R Holder rholder(at)avnet.co.uk sent:
[quote]
On 04/01/2012 21:06, Nigel Graham wrote:
> Graeme,
>
> See the attached photo for a good way to safety wire the
> exhaust springs. This is how the CSA Sport Cruiser boys do it.
>
> Nigel
One of the reasons this spring as shown needs a safety
wire is that the spring is on the wrong way round. The
openings face the lugs. So that it is easier to get the
spring on, and easier for it to jump off.
All my springs are put on the harder way with the spring
end openings away from the lug.
my 2 penny worth
Richard Holder
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