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tech / rec.aviation.soaring / Re: Another Cobra Trailer Gas Spring Question

SubjectAuthor
* Another Cobra Trailer Gas Spring QuestionGianni Isotope
+* Re: Another Cobra Trailer Gas Spring QuestionMark Mocho
|`* Re: Another Cobra Trailer Gas Spring QuestionGianni Isotope
| `- Re: Another Cobra Trailer Gas Spring QuestionMark Mocho
`* Re: Another Cobra Trailer Gas Spring QuestionMark Mocho
 `- Re: Another Cobra Trailer Gas Spring QuestionMark Mocho

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Another Cobra Trailer Gas Spring Question

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Subject: Another Cobra Trailer Gas Spring Question
From: gianniis...@gmail.com (Gianni Isotope)
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 by: Gianni Isotope - Tue, 3 May 2022 18:29 UTC

I was going to hijack Paul's thread, but thought better of it.

I have the opposite problem with my Cobra trailer -- the gas springs are far too stiff, making it so difficult to close the top that I actually broke one of the top handles clean off.

A couple of questions:

1. I have some paperwork saying that I could tap a nail into one end of the spring several times to release some of the pressure, but I cannot fathom how to gain access to the spring, as it is completely buried in a rectangular box. Is there any easy way to gain access to the spring, or at least the end of the spring where pressure can be relieved?

2. The broken handle was fastened to the metal top with rivets, and the backside of the broken rivet are buried behind another long rectangular box, which holds the horizontal locking bar for the trailer's top. Has anyone else had broken handle rivets on their Cobra trailer? If so, how did you reattach your handle?

Thanks!

Re: Another Cobra Trailer Gas Spring Question

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Subject: Re: Another Cobra Trailer Gas Spring Question
From: markmoch...@gmail.com (Mark Mocho)
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 by: Mark Mocho - Tue, 3 May 2022 19:31 UTC

When was your Cobra manufactured? The "riveted" handle attachment is completely different from every Cobra I have seen.

I was told by Alfred Spindelberger that pressure can be released using the nail method, but the end you need to access will require removing the spring. Also be aware that there is no way to determine how much the spring force is decreased except by trial and error.

Prior to Cobra offering the dual strut system found on trailers that have two sets of wing extensions supported by the trailer top ((Like 18 m and 21 m tips on the Jonker JS-1), I remember one Nimbus 4 owner tossing a sandbag on the rear of the trailer next to the rudder box before lifting the lid and removing the wing panels. He used just enough weight to allow the top to open, but not close. The extra weight was enough to ease the pull after the wings were out.

As a side note, the gas spring force on Cobra trailers can often be found marked on a triangular gusset on the inside of the trailer top about halfway along the length. It will say something like 1100. There are four other numbers that refer to the number of the front and rear locks, in case you need to get a key replaced.

Re: Another Cobra Trailer Gas Spring Question

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Subject: Re: Another Cobra Trailer Gas Spring Question
From: markmoch...@gmail.com (Mark Mocho)
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 by: Mark Mocho - Tue, 3 May 2022 19:34 UTC

I just noticed that you refer to "the horizontal locking bar for the trailer's top." I have never seen this on a Cobra trailer. Komets, yes, but not Cobra. Are you sure it's a Cobra?

Re: Another Cobra Trailer Gas Spring Question

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Subject: Re: Another Cobra Trailer Gas Spring Question
From: markmoch...@gmail.com (Mark Mocho)
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 by: Mark Mocho - Wed, 4 May 2022 12:07 UTC

It is also possible that the telescoping tubes are binding up due to damage or contaminated grease inside, or no lubrication at all. Before altering the pressure in the springs, try to determine if there is a mechanical issue that is restricting the free movement of the trailer top.

Re: Another Cobra Trailer Gas Spring Question

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Subject: Re: Another Cobra Trailer Gas Spring Question
From: gianniis...@gmail.com (Gianni Isotope)
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 by: Gianni Isotope - Wed, 4 May 2022 15:00 UTC

Mark, thank you for all of your comments. Trailer's title indicates it is a Cobra was manufactured in 1989, which matches the age of my LS7.

Re: Another Cobra Trailer Gas Spring Question

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Subject: Re: Another Cobra Trailer Gas Spring Question
From: markmoch...@gmail.com (Mark Mocho)
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 by: Mark Mocho - Wed, 4 May 2022 15:56 UTC

> Mark, thank you for all of your comments. Trailer's title indicates it is a Cobra was manufactured in 1989, which matches the age of my LS7.

Roger that. It seems that earlier Comets DID have the horizontal locking bar. Also, the lift struts are externally mounted, which exposes the telescoping tubes to grit and dirt. This can cause the tubes to become difficult to collapse. Try taking them off and checking for crap inside or external damage that impairs their travel.

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