Quote:
Originally Posted by finalcutjoe  Andy- I suppose one could argue that:
a)an Expedition EL really isn't that 'soft' of a suspension
or
b).2 meters/second^2 (17 lbs) is actually a very substantial force when discussing 5" metal frames. |
Using accelerometers, I think, is a good idea. What they say then, must be converted into forces that momemtarially are applied to the A-frame.
Somewhere I think you said, something like 24000 ft/lbs of force, was applied to the A-frame.
I don't know about you, but I would not want to get hit with that kind of force.
If the forces are truly any where near that, and applied thousands of times to the A-frame, as when it's being towed, I then don't question why the fatigue failures are occuring.
Airstream says, a soft ride is necessary. I have said that for over 40 years. There are opinions that differ.
A rough ride and/or extensive impact forces, to me,will cause damages. Again, some blame the design.
I feel you are on to some answers, with more testing, and let the test results speak out.
Contrary to some, who challenge the currect designs, 30 and 40 year old Airstreams had the same fatigue problems, but were seldom towed with rugged tow vehicles, as opposed to today, where the vast majority of tow vehicles are heavy duty trucks. So the damages, obviously, are more pronounced, greater in numbers, today than in the past.
I am looking into our repair records regarding damages to the front ends, in the absence of the front hold down plate.
Perhaps, we could come up with an update kit, if indeed it would prove as an advantage.
Please keep up the excellent work, with your testing.
Andy