Why two axles???? - Page 7 - Fiberglass RV


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Old 02-07-2013, 03:32 PM   #85
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The diagram you show relates to the front suspension of the typical circle track stock car with unequal length control arms. The source of alot of grief to me in my racing days!!! But doesn't relate to trailers.
When you see the 2 wheels on the same side of the trailer scrubbing they are doing so in opposite directions. This is because the trailer is turning on a point between the 2 axles.
This point is the instant center. The exact location of the IC depends on the load each wheel carries and any irregularities they encounter and the way they are mounted to the trailer. So yes very complicated!
My reason for bringing up ICs wasn't to get into this but to point out that bearings are used in pairs so there is no side load on them.
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Old 02-07-2013, 03:36 PM   #86
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Thanks, Fred!

I think...

Francesca
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Old 02-08-2013, 09:23 AM   #87
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Originally Posted by Francesca Knowles View Post
Everything I've been able to find on the topic seems to discuss "instant center" as a point somewhere between opposite sides of the vehicle (see image below).
"Instant center" is just point about which some complex system is effectively rotating, as if for that instant it is a simple pivot point. The suspension roll example is one application, the tandem axle trailer example is another application of the same idea in an unrelated situation.

I suggest a Google search for "instant center" (or better, "instantaneous center") for many examples... none of which are needed in this forum thread.
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Old 02-08-2013, 04:35 PM   #88
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My father told me about cars that were built with six and eight wheels, which had four and six wheel steering, respectively.

I think it makes great sense to articulate wheels to facilitate turning.


http://blog.hemmings.com/index.php/2...the-octo-auto/

Read reviews of four wheel steering trucks like the Silverado and Suburban. These provide not only a tight turning ration but the ultimate in trailer control.
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Old 02-08-2013, 06:12 PM   #89
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Bruscoe Schrader, my foot! What Columbus IN is known for after 1 April: architectural marvels from the Big 8 or 10 of world architecture.

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Old 02-08-2013, 06:56 PM   #90
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Eight wheels is O.K....I guess...

But for heavy towing involving tight turns, nothing beats my Vickers-Wolsely! One stroke of the offside brake and around she goes...


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Old 02-08-2013, 07:28 PM   #91
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Yes Sir, tracked armor! Almost zero turn. I've never seen the retractable pneumatics before. Did the French build that thang? Half-track restoration is on the rise. I wonder if you can glamp in an APC? Certainly useful for landsc[r]aping and carrying beer. Looking closer, I see Vickers on some of the background vehicles. Brits. Oh now I see you call it a Vickers-Wazzat.

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Old 02-08-2013, 07:36 PM   #92
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Hardened up pretty good aft but that radiator looks pretty vulnerable. Water-cooled machine gun. Armed and hammered!
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Old 02-08-2013, 10:42 PM   #93
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Thought you might like to see us in cruising configuration.

She'll do about 75 mph with the Trillium in tow, though she do wag a bit on the downhills...

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Old 02-09-2013, 02:46 AM   #94
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What do you get for gas mileage?
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Old 02-09-2013, 12:07 PM   #95
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To tell the truth, I've never calculated fuel economy, I s'pose because it doesn't cost me anything...I just commandeer fuel as I go along.

You'd be surprised how accommodating folks are!

Francesca
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Old 02-22-2013, 08:55 PM   #96
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Originally Posted by Francesca Knowles View Post
It's my understanding that tire pressure is based on the weight of the load. That's why the number on a car door, for example, is usually below the tire's actual maximum capacity.Any particular tire has a range within which it can be used on many different vehicles, each at a particular (under the max) pressure determined by the vehicle manufacturer.

And here's a chart for trailer tires that more or less illustrates the same thing:




Francesca
disagree and so do the tire makers.
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Old 02-22-2013, 08:57 PM   #97
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disagree and so do the tire makers.


With which part of the quoted statement, Floyd?

Francesca
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Old 02-22-2013, 09:44 PM   #98
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The chart is not as it seemeth, Francesca. It does not list pressure adequate to support a given load (a service pressure) but rather the minimum pressure that you might expect to support a given load for a while without ruining the tire, chump. The words "adequate," "minimum," and "chump" do not appear in the chart. This is one very good reason why it's difficult for chumps to understand. I'd suggest going back and reading Jared's explanation of the "pressure below which they may not roll" as applicable to aircraft tires in the previous edition of the popular tire education series. I'll sit this one out.

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