[AT] more HP guaranteed!/now front end on the ground.

rlgoss at twc.com rlgoss at twc.com
Fri Mar 17 08:53:24 PDT 2017


I had forgotten the timeline of your connection to OSU, Cecil. I was there on the faculty from 1966 to 1971.  Those were the heyday of Ditch Witch and the vibrating plow.


Larry
---- Cecil Bearden <crbearden at copper.net> wrote: 
> Back in the early 70's I was in Ag Engineering at Oklahoma State Univ.  
> I had the hardest time understanding why we would want 10 - 15% 
> slippage.  Finally one of my professors explained it as you need that 
> much to get the dirt to build up behind the tractor tread enough to hold 
> against the tread bar lug.  A lot of times when trying to figure how 
> much production the tractor is getting, the speed is taken from the 
> hourmeter or the speedometer on the tractor multiplied by the width of 
> the implement.  If that 15% slippage is not included, then the estimated 
> production is way off.   When I was there we had a test machine that had 
> one chisel shank in a trough with a conveyor belt below.  The machine 
> would fill the trough with soil and compact it before the chisel was 
> pulled through it.  The chisel was fitted with sensors and some type of 
> radioactive material was in the soil also.  It was supposed to give us a 
> force on the chisel at  various speeds.  It showed when doing tillage, 
> doubling the speed, tripled the horsepower requirement.  This was in the 
> days that the big 4wd tractors were just being built.  This was the 
> start of the 40ft wide chisels and triple grain drill hitches.   If I 
> could have found a manufacturer that would hire me, I would have been 
> working for a tractor manufacturer.  Little did I know that Massey was 
> about to go under, and Allis was being ripped apart by the Germans.
> 
> Cecil in OKla
> 
> 
> On 3/16/2017 7:47 PM, John Hall wrote:
> > To me its a different world when using 3 pt tillage tools, as they tend
> > to pull down on the tractor increasing traction and contributing to a
> > wheel stand. The last field I chiseled saw the front end come up so fast
> > I couldn't even attempt to stop it or let it down easy, it was
> > practically instantaneous. Several times I ran out of traction and
> > started spinning, but that normally happens slowly. When I start
> > spinning I either raise the machine slightly or let it spin through the
> > "tight" ground---one of those thing you decide at the moment as to how
> > the tractor is handling it. Eventually I want to make a weight bracket
> > for the 4020, if you have ever hung the factory weights on one of them
> > you know how bad of an idea stackable bolt on weights are. I've got
> > plenty of suitcase weights I can borrow off my grain drill.
> >
> > John Hall
> >
> > On 3/16/2017 1:42 PM, charlie hill wrote:
> >> Here you go, for anyone who feels like working through the math.
> >> http://www.agmachinery.okstate.edu/tractors/TractionTractorPerformance.pdf
> >>
> >> -----Original Message-----
> >> From: Stephen Offiler
> >> Sent: Thursday, March 16, 2017 1:10 PM
> >> To: Antique tractor email discussion group
> >> Subject: Re: [AT] more HP guaranteed!/now front end on the ground.
> >>
> >> Talking about slip... rang a bell.  Ah-ha, Nebraska tractor tests.  They
> >> include % slip in the drawbar test.  Without actually checking, my memory
> >> agrees with Charlie's stated 10-15% range.
> >>
> >> SO
> >>
> >>
> >> On Thu, Mar 16, 2017 at 12:52 PM, charlie hill <charliehill at embarqmail.com>
> >> wrote:
> >>
> >>> Just my opinion but I think sometimes when your front end is coming up
> >>> while
> >>> pulling a load it is from not allowing enough wheel slip.  I read an
> >>> article
> >>> in
> >>> Progressive Farmer many many years ago about proper wheel slip for maximum
> >>> efficiency.  If I remember right it was somewhere in the neighborhood of
> >>> 10
> >>> to 15%.
> >>> Air pressure is the key and it varies by soil type.  I just don't remember
> >>> exactly what the specifics are.
> >>>
> >>> Charlie
> >>>
> >>> -----Original Message-----
> >>> From: John Hall
> >>> Sent: Tuesday, March 14, 2017 8:11 PM
> >>> To: Antique tractor email discussion group
> >>> Subject: Re: [AT] more HP guaranteed!/now front end on the ground.
> >>>
> >>> To be honest, I have no idea. Come to think of it I had one of the rears
> >>> repaired last year (new tube and patch the rim around valve stem), and I
> >>> don't remember if I checked to see if both sides are equal. Wouldn't
> >>> hurt to check. I'm down right now until I get the new radiator
> >>> installed. I will say we don't really let the sidewalls bulge out much
> >>> when pulling heavy loads.
> >>>
> >>> John
> >>>
> >>> On 3/14/2017 12:02 PM, charlie hill wrote:
> >>>> John,  how much air pressure do you run in the rear tires?
> >>>>
> >>>>
> >>>> Charlie
> >>>>
> >>>> -----Original Message-----
> >>>> From: John Hall
> >>>> Sent: Friday, March 10, 2017 4:19 PM
> >>>> To: Antique tractor email discussion group
> >>>> Subject: Re: [AT] more HP guaranteed!
> >>>>
> >>>> Thinking it might give the 4020 more pep than a turbocharger. Course I
> >>>> can't keep the front end on the ground as it is pulling the chisel plow.
> >>>> Gonna need more front end weights I guess.
> >>>>
> >>>> John
> >>>>
> >>>>
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