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Re: [GMCnet] Hitch mounted Motorcycle - Scooter carriers [message #325992 is a reply to message #325991] Tue, 14 November 2017 07:37 Go to previous messageGo to previous message
Richard Denney is currently offline  Richard Denney   United States
Messages: 920
Registered: April 2010
Karma:
Senior Member
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

On Tue, Nov 14, 2017 at 7:44 AM, Rob Mueller
wrote:

> G'day,
>
> Question: As the weight is increased on the rear suspension it would drop,
> when the ride height control system sensed it drop below
> the spec it would raise it which would transfer weight back to the front
> end would it not?
>
> 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 John
> Phillips
> Sent: Tuesday, November 14, 2017 1:52 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Hitch mounted Motorcycle - Scooter carriers
>
> Our tongue weight is an example of a third-class lever.
> The front axle is the fulcrum = Af
> The rear axle is the force = Ar
> The ball hitch is the load, tongue = T
> ---Af------------------Ar-------T
> The distance from (Af to T) / (Af to Ar) tongue weight = rear axle load
> increase.
> Rear axle load increase - tongue weight = front axle weigh decrease.
> Af to Ar = wheelbase.
> In the case of a trailer T is the ball center.
> In the case of carrying, an object on a rack, T is the center of gravity
> for the item.
> For the front carrier:
> Af becomes the force.
> The distance from (T to Ar) / (Af to Ar) tongue weight = front axle load
> increase.
>
> I hope that helps to show how much moving the rack back a foot changes the
> loading.
>
> *John Phillips*
>
>
> _______________________________________________
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>



--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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