I would bet on a carrier bearing for driveshaft support and a chain drive to get the speed up from the 540rpm pto. Likely back then the truck rear had way low gears, like in the high 5's or 6's and even with tall tires 20mph would need a 2:1 ratio sprocket setup. Neat idea.
Mike On Nov 20, 2012 7:42 PM, "Curt Raymond" <curtlud...@yahoo.com> wrote: > Hmm, I'd doubt 37" tires. Maybe it was the rear axle of the wagon and > there was a transmission involved... > Actually now that I think of it Dad might have mentioned something about > that. He claims to have seen the rig years later before it was sent off for > scrap but never saw it in action. > > -Curt > > > > Date: Tue, 20 Nov 2012 13:03:17 -0600 > From: Fmiser <fmi...@gmail.com> > To: Mercedes Discussion List <mercedes@okiebenz.com> > Subject: Re: [MBZ] Volvo? now fast tractors > Message-ID: <20121120130317.42fbd0b2.fmi...@gmail.com> > Content-Type: text/plain; charset=US-ASCII > > > Curt Raymond wrote: > > > ... so they took a truck > > rear end and made it the front axle for a wagon. They powered > > that axle with the PTO of the tractor. Supposedly this > > arrangement could make about 20mph which I imagine to be as > > fast as anybody would dare. > > Some rough calculations - with guesses. > > tire diameter in inches 30 > tire circumference in ft 7.853982 > road speed, MPH 20 > road speed, feet/minute 1760 > tire RPM at road speed 224.09016 > differential ratio 4 > driveshaft (PTO) RPM 896.360639 > > > PTO RPM is typically 540, as I recall, so 900 RPM is a bit fast. > > Try again with other numbers > > tire diameter in inches 37 > tire circumference in ft 9.686577 > road speed, MPH 20 > road speed, feet/minute 1760 > tire RPM at road speed 181.694724 > differential ratio 3 > driveshaft RPM 545.084173 > > There. With a 37" tall tire, and a axle ratio of 3:1, the > numbers match up. *smiles* It's withing the realm of possible. > > -- Philip, avoiding work. > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
