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Re: [GMCnet] Hitch mounted Motorcycle - Scooter carriers [message #325996 is a reply to message #325994] Tue, 14 November 2017 11:00 Go to previous messageGo to previous message
Keith V is currently offline  Keith V   United States
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
Senior Member
I'm pretty sure that if MY coach was on a 90 degree hill both axles would have zero load.

In fact the load would most likely be all on the roof :D


I'm in the rear axle is the fulcrum camp frame flex or not.


________________________________
From: Gmclist on behalf of John Phillips
Sent: Tuesday, November 14, 2017 9:53:26 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Hitch mounted Motorcycle - Scooter carriers

Rob, the lever runs from the load to the opposite axle.
The opposite axle is the pivot point.
The near axle would be the pivot point if the chassis bent at that point.
There will be some chassis flex but that flex will affect the actual
calculation on the order of 1 lb to 1,000,000.
If you take the chassis tilt into account both lever sections are affected
by the same factor leaving the ratio unchanged.
If you go up a 90-degree hill the entire weight is suspended from the front
axle and 0 load in on the rear wheels.
Any hill we climb the slope effect is insignificant.


On Tue, Nov 14, 2017 at 6:45 AM, Rob Mueller
wrote:

> Rick,
>
> Thanks for the explanation; if I understand it correctly in this instance
> the GMC could be considered a "lever."
>
> The pivot point is the rear wheels.
>
> From the rear wheels to the back bumper is the short end of the lever.
>
> From the rear wheels to the front bumper is the long end of the lever.
>
> Putting weight on either end of the lever will cause the opposite end to
> go up.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of
> Richard Denney
> Sent: Tuesday, November 14, 2017 7:38 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Hitch mounted Motorcycle - Scooter carriers
>
> Rob: No. It will level it up, to be sure. But it won't move the moment of
> inertia. Imagine putting 10,000 pounds of tongue weight at the back bumper
> (and assume for a moment that it wouldn't fold up the frame or overcome the
> capability of the air bags, which, of course, it would in both cases).
> 10,000 pounds at the back bumper would cause the front wheels to lift in
> the air. Jacking up the rear suspension would just make those front wheels
> lift higher.
>
> Rick "late 260's are already heavy at the rear" Denney
>
>
>
>
> _______________________________________________
> GMCnet mailing list
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>



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*John Phillips*
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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