Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-29-2010, 11:59 AM   #15
3 Rivet Member
 
1973 31' Sovereign
Fort Worth , Texas
Join Date: Jul 2010
Posts: 102
Images: 27
Quote:
Originally Posted by Mikethefixit View Post
I don't know about Oct 7 but Id say YES FIXABLE . But you realize you will have to drop that axle that looks shot anyway. DONT PUT THOSE BACK IN unless you want the same problem all over again somewhere else.
If that break is not at the axle mounting plate I see no reason it cant be fixed.
GOOD LUCK
Mikethefixit

This crack goes straight thru to the axle. is that an issue?

Steve
__________________

__________________
We will soon begin traveling with our family of 5 (and a large dog) Looking forward to remodeling our Airstream, awesome adventures, and meeting new people.

www.steventothemax.com
steven2themax is offline   Reply With Quote
Old 09-30-2010, 10:48 AM   #16
1972 Travelux Princess 25
 
Cobourg , Ontario
Join Date: Oct 2008
Posts: 1,042
Just buy the factory engineered reinforcing plates and bolt them on. Read the instructions linked from the ad. The position of the crack is not an issue in this case.

Frames crack because they are overstressed, like bending a wire back and forth back and forth until it breaks. Airstreams are built light and will not take a lot of stress. Worn out axles with no resiliance left in them, too heavy a tow vehicle, and too stiff hitch bars will pound your Airstream to pieces. Loose rivets, bent sheet metal, cracked frames are the end result of too hard use.
__________________

__________________
Living in the trailer park of sense, looking out the window at a tornado of stupidity.
Ganaraska is offline   Reply With Quote
Old 09-30-2010, 11:34 AM   #17
Maniacal Engineer
 
barts's Avatar
 
1971 25' Tradewind
Menlo Park , California
Join Date: Jan 2010
Posts: 1,223
Images: 1
Blog Entries: 4
From this engineer's viewpoint, likely causes (in order) are:

  1. The axles have insufficient travel to absorb road shocks; this can be because the axle's rubber suspension rods have taken a set (e.g. axles need replacing), or because the trailer was taken over rough roads at too high a speed.
  2. The original frame design is marginal and over time fatigued.
  3. Excessive mass at the front and rear of the trailer can cause higher than normal loads in the frame.
Note that a heavy tow vehicle suspension itself is unlikely to be the cause of this sort of damage; road shocks that would cause violent vertical movement of the tow vehicle's hitch would cause more problems when the trailer tires encountered them.

- Bart
__________________
Bart Smaalders
Menlo Park, CA
http://tinpickle.blogspot.com
http://smaalders.net/barts
barts is offline   Reply With Quote
Old 10-01-2010, 08:02 PM   #18
1972 Travelux Princess 25
 
Cobourg , Ontario
Join Date: Oct 2008
Posts: 1,042
Bart this garage mechanic agrees with you except for the part about the tow vehicle. A heavy tow vehicle suspension means a heavy tow vehicle, like a 1 ton dually truck. Such a vehicle will whip the Airstream around more than a light vehicle with soft springs, on big bumps and general vibration as you drive down the road. I admit this is a minor issue compared to collapsed suspension and rigid spring bars. But I have noticed that the type of owner who will not pull out of the driveway without a 1 ton dually to tow his Bambi, is also the type who believes he has to have 1200 lb spring bars when he would be better off with none at all.
__________________
Living in the trailer park of sense, looking out the window at a tornado of stupidity.
Ganaraska is offline   Reply With Quote
Old 10-01-2010, 09:11 PM   #19
3 Rivet Member
 
1973 31' Sovereign
Fort Worth , Texas
Join Date: Jul 2010
Posts: 102
Images: 27
So what's the best way to close this gap before it gets welded. I'm trying to use jacks and jack stands to get the job done.

Can I use a jack at the frame by the rear bumper?
__________________
We will soon begin traveling with our family of 5 (and a large dog) Looking forward to remodeling our Airstream, awesome adventures, and meeting new people.

www.steventothemax.com
steven2themax is offline   Reply With Quote
Old 10-02-2010, 12:22 AM   #20
Maniacal Engineer
 
barts's Avatar
 
1971 25' Tradewind
Menlo Park , California
Join Date: Jan 2010
Posts: 1,223
Images: 1
Blog Entries: 4
To fix this, I'd jack the trailer level using a minimum of six screw jacks: two in front of the axles, four to the rear to suspend the broken rear section. This should close up the gap to 1/16" or so; if not you may need to apply traction, welding temporary pieces to the frame to permit fitting heavy threaded rod to pull cracks closed; a come-a-long cleverly applied may also work. You may need to remove the axles before doing this; you will need to remove them to add the strengthening plates which are needed (others have mentioned the part #).

You'll want to weld the cracks closed, grind smooth, paint both sides and then fit the reinforcing plates. It will go pretty fast; like many of these sorts of things the deciding takes longer than the doing. Remember that molten metal has no strength - don't weld pieces under stress.

- Bart
__________________
Bart Smaalders
Menlo Park, CA
http://tinpickle.blogspot.com
http://smaalders.net/barts
barts is offline   Reply With Quote
Old 10-03-2010, 10:34 PM   #21
2 Rivet Member
 
Airstray's Avatar
 
2003 22' International CCD
1977 31' Excella 500
1966 26' Overlander
Shelton , Washington
Join Date: Nov 2005
Posts: 52
Images: 13
Question

My '03 22ft. Int. CCD has two small horizonal cracks on the forward curbside frame where the outriggers attach. I agree with jacking the trailer level, welding, grinding and reinforcing the frame. Has anyone considered forcing whatever size box tubing will fit between the frames, the larger the better, forward of the FW tank then weld all possible points? Any thoughts? Airstray
__________________
Airstray is offline   Reply With Quote
Old 10-04-2010, 06:53 PM   #22
3 Rivet Member
 
1973 31' Sovereign
Fort Worth , Texas
Join Date: Jul 2010
Posts: 102
Images: 27
Can I do this repair without dropping the belly pan?
__________________
We will soon begin traveling with our family of 5 (and a large dog) Looking forward to remodeling our Airstream, awesome adventures, and meeting new people.

www.steventothemax.com
steven2themax is offline   Reply With Quote
Old 10-05-2010, 10:08 AM   #23
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,499
Images: 1
Quote:
Originally Posted by steven2themax View Post
Can I do this repair without dropping the belly pan?
Absolutely "NO".

Both sides must be welded to be effective.

You can cut a portion of the underbelly away, and then splice it back in when the welding, grinding and plating, has been completed.

Andy
__________________
Inland RV Center, In is offline   Reply With Quote
Old 10-08-2010, 06:44 PM   #24
3 Rivet Member
 
1973 31' Sovereign
Fort Worth , Texas
Join Date: Jul 2010
Posts: 102
Images: 27
Thanks to everyone for advice. Repair was done today. Took lots of pictures for everyone. I think i will do a detailed write up on the brakes, shocks, axles, cracked frame when I get some time.
__________________
We will soon begin traveling with our family of 5 (and a large dog) Looking forward to remodeling our Airstream, awesome adventures, and meeting new people.

www.steventothemax.com
steven2themax is offline   Reply With Quote
Old 10-10-2010, 08:22 PM   #25
steel/aluminum fabricator
 
2004 22' International CCD
Penticton , British Columbia
Join Date: Oct 2010
Posts: 132
Whats the body like? A broken frame rail will cause stresses on the body. The roof and windows would be where i would have a look .
__________________
zedex is offline   Reply With Quote
Old 11-28-2010, 11:14 AM   #26
1 Rivet Member
 
1975 31' Sovereign
newburgh , Maine
Join Date: Dec 2009
Posts: 9
Images: 1
to add a bit more to Bart’s comments:
The original frame design is marginal and over time fatigued.

Regardless of what caused the problem, stiff truck, bad axles, overloaded trailer, corrosion they all point in the same direction: failure of the C channel. The failure was at the top web of the channel where there is the greatest tension stress on a cantilevered beam. I would have hoped that the floor diaphragm would have been able to assist in taking that load but it did not.

The solution is the same regardless of the cause; increase the area of the top web of the channel (increase the section modulus). This can be done in any number of ways including the proposed fix from airstream. Note that this fix only has a top flange the bottom has been cut around the axles. Which is fine it’s the top that needs reinforcing?

Another solution would be to stitch weld a plate to the top of the channel, just eyeballing I would say a 3/16” X2.5” X 6’ plate with a 3/12 stitch. Course you could only do this when the floor is removed, and then you would have to dado a groove in the plywood floor. Anyhow this is potential solution, before being implemented it should be designed by someone well versed in dynamic loading and metal fatigue.
Wouldn’t hurt to add one also to where the tension goes to the bottom of the channel somewhere between the axle and the hitch. .

Given the number of failures I do agree with Bart’s choice of words “marginal”. I am surprised that the floor diaphragm could not contribute more the C Channel. I would also check the bolt connections to the channel, I doubt if they are sheared off (that would be really bad) but I bet they are elongated. In other words the connection between the C channel and the floor is also marginal and you might think about adding a few more bolts to there.

Well do not give up your trip in a total panic, or spent nights worrying about this. If its parked its fine!. If you are planning a trip look under the trailer above the axle how’s the Channel look, if there is a hairline you have a problem, just use the patch and go another 40 years!!

If you are remodeling then think of not waiting for this to happen do the repair while it is convenient.
__________________
claudebo is offline   Reply With Quote
Old 11-29-2010, 12:27 AM   #27
Maniacal Engineer
 
barts's Avatar
 
1971 25' Tradewind
Menlo Park , California
Join Date: Jan 2010
Posts: 1,223
Images: 1
Blog Entries: 4
Quote:
Originally Posted by claudebo View Post
I am surprised that the floor diaphragm could not contribute more the C Channel. I would also check the bolt connections to the channel, I doubt if they are sheared off (that would be really bad) but I bet they are elongated. In other words the connection between the C channel and the floor is also marginal and you might think about adding a few more bolts to there.
The floor itself will add almost no bending strength to the frame, because the modulus of elasticity of wood is prob. 20 or 30 times less than that of steel. In other words, the steel is so much stiffer than it will fail long before the wood takes an appreciable amount of the load.

The floor's job is to tie the shell to the frame. The amount of load sharing between the shell and the frame depends on their relative stiffnesses, and the strength of the connection between the two.

As an engineer, if I ran the zoo I'd use more of the weight budget to build a stiffer frame- but that doesn't sell as well as heavier cabinets, bigger tanks, batteries, etc. A stiffer frame reduces shell deflection, and means the frame needs to be stronger as well as stiffer.

- Bart
__________________

__________________
Bart Smaalders
Menlo Park, CA
http://tinpickle.blogspot.com
http://smaalders.net/barts
barts is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
frame for entrance door cracked letsgo123 Exterior Storage Compartments & Access Doors 13 08-07-2008 07:45 PM
old Dometic fixable? or replace? prairieprinc Refrigerators 10 09-21-2007 05:04 PM
cracked Door frame Didgiman Doors & Locks 10 06-21-2007 01:00 PM
Door frame cracked till Doors & Locks 11 02-14-2004 08:06 AM
Cracked door frame 77caravaner Doors & Locks 5 10-11-2002 07:43 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:54 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.