HOW TO HANDLE - Page 2 - Fiberglass RV


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Old 02-19-2009, 01:21 PM   #15
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He's just yanking your chain... every one KNOWS that the real factor it the airspeed of an unladen european swallow
An African swallow maybe, but not a European swallow. The African Swallow can bear more weight in coconuts.
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Old 02-19-2009, 01:27 PM   #16
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By GEORGE! You are RIGHT. I mean, just THINK MAN! The SHAPE of the coconut is a close approximation for the shape of the eggs. Ye GODS!! I bow to the master... you have well and truly solved the sway problem.


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An African swallow maybe, but not a European swallow. The African Swallow can bear more weight in coconuts.
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Old 02-19-2009, 01:37 PM   #17
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By GEORGE! You are RIGHT. I mean, just THINK MAN! The SHAPE of the coconut is a close approximation for the shape of the eggs. Ye GODS!! I bow to the master... you have well and truly solved the sway problem.
WOW, I did it without even realizing the correlation between the shape of a coconut and that of an egg. But to be fair, it was your initial line of thinking that brought me to this conclusion.

I sure hope there are other Monty Python fans out there who understand, or they might think of banning us to the loony bin.
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Old 02-19-2009, 01:58 PM   #18
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The toilet thing had lost me, but this I understand.
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Old 02-19-2009, 03:58 PM   #19
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***The toilet thing had lost me***

Ahhhh..... that's just 'cause you guys don't have any water down there in #48


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The toilet thing had lost me, but this I understand.
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Old 02-19-2009, 05:24 PM   #20
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Hmmm. I wonder if a partially filled water tank would add to the problem because of the weight of the water sloshing about.

Wi nøt trei a høliday in Sweden this yer?

See the løveli lakes

The wonderful telephøne system

And mani interesting furry animals

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Old 02-19-2009, 06:28 PM   #21
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We all know that the flight of a golf ball is more stable because of the dimples. Perhaps if an egg had dimples it would be less inclined to sway at high speeds.
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Old 02-19-2009, 06:42 PM   #22
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HOW TO HANDLE TRAILER SWAY

[>snip<

[b]If your trailer doesn't have brakes, then your alternative is to slightly speed up the tow vehicle to try to get the trailer to start behaving. Be careful when doing this and it may not be the best idea if you are already going faster than you should. If the cause of the sway was your speed, this might just make matters worse.
No no no no no. NO!

Don't speed up and try to drive out of trailer sway! Ever!

Go to http://towingstabilitystudies.co.uk/stabil...tudies_game.htm and work the simulator. It will help you to understand what part speed has in trailer sway.

How you load the trailer also has an large effect. Be sure at least 10 percent of the trailer's weight is on the tongue. This is one of those cases where more is better. 15 or 20 percent of the trailer's weight on the tongue would be even better from a stability standpoint.

Also, make sure your tires are properly inflated - both on your tow vehicle and trailer. Don't use passenger car tires on your trailer if it is prone to sway. Tires built for trailer towing service will help prevent sway due to their stiffer sidewalls.

If you tow enough, you will someday experience trailer sway. If you are lucky it will not be a severe problem.

Again, if your trailer begins to sway the best way out is to SLOW DOWN!

-- Dan Meyer
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Old 02-20-2009, 05:18 AM   #23
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...that tue Euro manufacturers tend to put the axel a bit further back. might it be a "center of gravity" thing?
Actually, it's the other way around - Euro manufacturers put the axle further forward so that tongue weight is reduced. This is because we generally use lighter tow vehicles that cannot accept high tongue weights.

In Europe a tongue weight of 4-7% is considered 'safe' and if you look at big tow vehicles and you divide the max permitted tongue weight by the max permitted trailer weight, you often get a figure nearer 4%.

With lower tongue weights, sway will happen at lower speeds - which is one big reason why all European countries have lower speed limits for trailers. This makes it surprising that until very recently, sway control was unusual on European trailers - now a friction-damping coupler tends to be found on upmarket trailers.

One reason there is a critical speed above which sway will start is that on most trailers the airflow over the front/top edge produces aerodynamic lift, so the faster you go, the greater the lift and so the less the tongue weight. You will see that almost all European trailers have the front of the trailer angled back fairly sharply - this reduces the aerodynamic lift and so increases the critical speed for sway - European trailers are towed near enough to their critical speed that this design feature is needed.

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Old 02-20-2009, 03:33 PM   #24
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A longer tongue can mean lower tongue weight (longer lever requires less vertical force on end to have more torque around axle) but it also depends on where the Center of Gravity is -- If the longer tongue moves the COG forward, then tongue weight will increase.

Suffice it to say that Euro trailers are designed to a dissimilar model that produces a lower tongue weight in a properly balanced rig.
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Old 02-21-2009, 03:15 AM   #25
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Anyone who wants to experiment with tongue weights can use this trailer balance spreadsheet - it was written for teardrop builders to use, but if you mentally change the illustration to a travel trailer, the physics is just the same!
Trailer Balance Spreadsheet

Lengthening a tongue doesn't make much difference to tongue weight, unless very heavy things are put on the lengthened tongue - it might change a 10% tongue weight to 9% or, at the extreme, to 8%.

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Old 02-21-2009, 12:25 PM   #26
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It's proportional -- If one were to double the tongue length, one would halve the tongue weight... (and also halve the effects of trailer sway on the rear of the tow vehicle; that's why gravel trailers on the US West Coast use tongues that are almost as long as the trailer itself -- I need to find a picture of one).
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Old 02-21-2009, 02:29 PM   #27
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It's proportional -- If one were to double the tongue length, one would halve the tongue weight... (and also halve the effects of trailer sway on the rear of the tow vehicle; that's why gravel trailers on the US West Coast use tongues that are almost as long as the trailer itself -- I need to find a picture of one).
Pete - here is a picture - does not do justice to the full length of the tongue but gives the idea.

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Old 02-21-2009, 03:30 PM   #28
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It's proportional -- If one were to double the tongue length, one would halve the tongue weight... (and also halve the effects of trailer sway on the rear of the tow vehicle; that's why gravel trailers on the US West Coast use tongues that are almost as long as the trailer itself -- I need to find a picture of one).

And here I always thought that gravel trailers have long tongues because of pavement loading.

But what are the aerodynamic effects of an unladen gravel trailer?
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