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. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
Any further information or new developments regarding the bolt failure
discussed last year? Discussion found he http://groups.google.com/group/rec.a...b46ee572ef6bb6 Thanks, WD |
#2
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
WD: The writeup I did on my solution seems to have passed muster at
the factory as I have learned that some folks have been referred to it by Cobra. Here's the link again: http://www.box.net/shared/9dvnt7qgs8 Steve Koerner www.wingrigger.com |
#3
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Apr 23, 2:09*pm, Steve Koerner wrote:
WD: *The writeup I did on my solution seems to have passed muster at the factory as I have learned that some folks have been referred to it by Cobra. *Here's the link again:http://www.box.net/shared/9dvnt7qgs8 Steve Koernerwww.wingrigger.com Are you making these backing plates for sale or is the factory going to create a modification kit, asking just in case? |
#4
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Monday, April 23, 2012 2:09:27 PM UTC-4, Steve Koerner wrote:
WD: The writeup I did on my solution seems to have passed muster at the factory as I have learned that some folks have been referred to it by Cobra. Here's the link again: http://www.box.net/shared/9dvnt7qgs8 Steve Koerner www.wingrigger.com The backing plate does not really help, as there are reinforcement inserts in the top where the bolts go through, but not in the broader area under the handle. Distortion of the corners of the trailer is a separate problem from the bolts. I sketched a solution that Alfred said he would build; this reminded me I hadn't received the parts and I just sent Alfred and Ralf an email. I've been a wee bit busy, sorry this hasn't gotten completely sorted yet... Hope this helps, Best Regards, Dave "YO electric" |
#5
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Apr 23, 7:52*pm, Dave Nadler wrote:
On Monday, April 23, 2012 2:09:27 PM UTC-4, Steve Koerner wrote: WD: *The writeup I did on my solution seems to have passed muster at the factory as I have learned that some folks have been referred to it by Cobra. *Here's the link again:http://www.box.net/shared/9dvnt7qgs8 Steve Koerner www.wingrigger.com The backing plate does not really help, as there are reinforcement inserts in the top where the bolts go through, but not in the broader area under the handle. So a backing plate that distributes the load over an area that is around ten times greater than the area under the original handle does not really help. That's a pretty interesting conclusion, Dave. I'm glad you have this all sorted out for them now. |
#6
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Tuesday, April 24, 2012 2:05:23 AM UTC-4, Steve Koerner wrote:
On Apr 23, 7:52*pm, Dave Nadler wrote: On Monday, April 23, 2012 2:09:27 PM UTC-4, Steve Koerner wrote: WD: *The writeup I did on my solution seems to have passed muster at the factory as I have learned that some folks have been referred to it by Cobra. *Here's the link again:http://www.box.net/shared/9dvnt7qgs8 Steve Koerner www.wingrigger.com The backing plate does not really help, as there are reinforcement inserts in the top where the bolts go through, but not in the broader area under the handle. So a backing plate that distributes the load over an area that is around ten times greater than the area under the original handle does not really help. That's a pretty interesting conclusion, Dave. I'm glad you have this all sorted out for them now. The area where the bolts goes through has a solid material between the inner and outer laminates; other than that its just the expanding core material they use (no compressive strength). Spindelberger told me it does not help to add a backing plate because of this... Hope that is clear, Best Regards, Dave |
#7
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Apr 24, 4:25*am, Dave Nadler wrote:
The area where the bolts goes through has a solid material between the inner and outer laminates; other than that its just the expanding core material they use (no compressive strength). Spindelberger told me it does not help to add a backing plate because of this... Hope that is clear, Best Regards, Dave Dave, My trailer has not such reinforcing inserts. In fact I proposed introducing such inserts as the permanent fix. Only the handles themselves have hard inserts. If there were inserts the outer shell would not have collapsed toward the inner shell causing the bolt tension to be eliminated. I have photos of the severe deformation of the outer shell under the handles of my trailer. In my opinion the insert fix would be far superior to the backing plate solution but it fell on stony ground. Andy |
#8
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
The structure immediately under the handles had clearly collapsed.
There is no such solid material between the inner and outer laminate on mine. The backing plate has resolved the problem quite well. |
#9
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
On Tuesday, April 24, 2012 11:26:45 AM UTC-4, Steve Koerner wrote:
The structure immediately under the handles had clearly collapsed. There is no such solid material between the inner and outer laminate on mine. The backing plate has resolved the problem quite well. I've looked at my hinge bolts a number of times, but can't detect any problems. Are there any symptoms that precede bolt failure, i.e. loose handles? TIA, Frank (TA) |
#10
|
|||
|
|||
Cobra Top Hinge Bolt Failure - Revisit
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Cobra top hinge plate bolt failure | Andy[_1_] | Soaring | 43 | May 24th 11 03:41 AM |
Cobra top hinge plate bolt failure | Steve Koerner | Soaring | 19 | May 22nd 11 03:30 PM |
Cobra top hinge plate bolt failure | JJ Sinclair[_2_] | Soaring | 0 | May 18th 11 07:45 PM |
Cobra top hinge plate bolt failure | Andy[_1_] | Soaring | 0 | May 17th 11 12:01 AM |
Cobra bottle jack failure | db_sonic | Soaring | 15 | October 30th 09 03:34 PM |