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Old 07-25-2016, 09:15 AM   #113
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I believe half the people here are below average. (think about it.....!)
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Old 07-25-2016, 10:26 AM   #114
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Here is some fun:
So for all those above me, please help correct me......
F= m*(α*(Ri-R)+ω*ω*(Ri-R)+a)

So where m goes has a huge impact more so than just front to rear tongue weight.
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Old 07-25-2016, 10:46 AM   #115
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Quote:
Originally Posted by GeeSag View Post
Here is some fun:
So for all those above me, please help correct me......
F= m*(α*(Ri-R)+ω*ω*(Ri-R)+a)

So where m goes has a huge impact more so than just front to rear tongue weight.
Fun? I'm tired already! (BTW, I'm not above you) Yes this certainly comes into play...significantly...but there would be a whole bunch of variables to add to the calculation, which I don't even want to think about.
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Old 07-25-2016, 10:48 AM   #116
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A lot of pontification here...

Stick a Sherline scale under the tongue of the trailer as you load it...or go to the Cat scales.
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Old 07-25-2016, 11:15 AM   #117
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Even if he balanced it out by putting more luggage in the front, the mass of that big booty would go a long way to contributing to a tail wagging the dog situation. You would not believe the engineering skull sweat that goes into determining where stuff goes inside the trailer and how much it is allowed to weigh. It blows my mind that people think of gutting out a trailer and redesigning the interior with exotic solid woods and stone counter tops, their only concern being how it will look and affect functionality when they are done.
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Old 07-25-2016, 11:58 AM   #118
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A little common sense and practical experience goes a long way.

I did a gut and refit of my trailer, no exotic material like stone or tile, but my first attempt made the rear of the trailer too heavy. This was apparent early on, (upon the first tow past 60 MPH) so I rebuilt the bath a lot lighter.

A little here, a little there adds up...

I weighed the stuff I took out, it surprised me.

In the course of this ordeal, I learned that if the rear of the trailer is too heavy, (well aft of the axles) no amount of weight on the tongue will restore stability. I learned this via practical experiment.


Gradiens super tenui glacie.
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Old 07-26-2016, 07:05 AM   #119
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Attached is what the the FAA has to say about weight and balance. Very good read even for this non Internet engineer.
Part of my military training and qualifications consisted of doing W&B calculations for aircraft loading. Also spent ten years living and cruising in a 32 ft sailboat where proper W&B was critical to a safe fast sail. Much of this can be directly related to our Airstreams.

https://www.faa.gov/regulations_poli...83-30_Ch04.pdf
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Old 07-26-2016, 08:50 AM   #120
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Thanks for this resource, Michael. The part you attached is about static weight -- basically up and down -- but nothing about the effect of heavy loads fore and aft on "yaw" or "sway" while the aircraft is in motion. Might there be another section relating to these kinds of dynamic forces on a plane in flight?

The resource posted by markdoane in Post #180 in the Out Of Control Sway thread here:

http://www.airforums.com/forums/f238...ay-152451.html

had a very good discussion of yaw, the link for which follows:

http://caravanandmotorhomebooks.com/caravan-dynamics/


Thanks again,

Peter
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Old 07-26-2016, 10:28 AM   #121
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Someone made a boat analogy…It's interesting.

Kayaks have some ratings that are difficult for most to quantify.

One is initial stability ( how easily the boat rocks ). ( trailer sways ?)

One is final stability ( how easily the boat capsizes ). ( trailer flips ?)

Some Kayaks rock very easily but are very hard to tip. I propose that a trailer rig that is easy to " rock" is also easy to " roll".

Originally Kayaks were designed to capsize. But it's not an exercise for novices, as there are some dangers involved.

My point is referring to mishaps, and safety. For the sake of argument…If a kayak flips 1% of outings…it's not very critical. If an Airsttream flips .001% of outings….. it's a major concern.

A statement like " I traveled 3000 miles with a storage trunk on my rear , with no problems " does not really translate to a safe practice.

A member stated the the driver would have immediately realized that there was a safety issue. ( a critical issue !!!) Why are these storage boxes legal ?
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Old 07-26-2016, 10:36 AM   #122
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I think its time to get Sheldon Cooper involved! This one is getting too involved for me. Great opinions , totally unhampered with facts.
Pete
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Old 07-26-2016, 10:43 AM   #123
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I think its time to get Sheldon Cooper involved! This one is getting too involved for me. Great opinions , totally unhampered with facts.
Pete
The photo of that huge box hung off the trailer, way beyond any Airstream recommendation, is not a "fact?"

Airstream accepts the Fiamma bike rack at about 92 pounds total weight, and hugging the rear bumper, as an acceptable rack. And no others as far as I know.

Fact!

Just because we don't know the actual weight of that huge box (empty and/or loaded) does not prevent reasonable people from discussing its suitability for the exact location shown in the photo.

[which is "not suitable" IMO]

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Old 07-26-2016, 11:26 AM   #124
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I think its time to get Sheldon Cooper involved! This one is getting too involved for me. Great opinions , totally unhampered with facts.
Pete
I must be way far beloe ehverage...WTH is Sheldon Cooper?

Bob
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Old 07-26-2016, 11:28 AM   #125
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I think…..opinions are allowed here.

Quote:
Originally Posted by white laker View Post
I think its time to get Sheldon Cooper involved! This one is getting too involved for me. Great opinions , totally unhampered with facts.
Pete
I also think safety is very important.

I have already agreed that facts are fact. Interpreting facts sure can lead to a lively discussion.

In this case, facts could lead to a lively discussion, as well. Facts such as what type of tow vehicle was involved in the very scary mishap.
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Old 07-26-2016, 12:33 PM   #126
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I must be way far beloe ehverage...WTH is Sheldon Cooper?

Bob
If your spelling is any indication . . .



Well, I agree -- who the heck is Sheldon Cooper? Guess we don't watch enough television! I had to look it up.

https://en.wikipedia.org/wiki/Sheldon_Cooper

Cheers,

Peter

PS -- How about some new tunes on the OTRA Music thread?
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