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F-20 versus 806

B

boberjagel

Member
So when I was very small maybe like 5 or 6 dad plowed with F-20 and 2-16's John Deere plow. So getting into the arithmetic class I stated that now the 806 has 100 horsepower. Thus it will pull 10 bottom plow based off of the F-20 performance. I received an A in school and F at the local IH dealer. Where did I go wrong???

.
 
Well if u would have said that 85 h p tractor would pull a 5/16 plow u would have been believable and passed.
 
Drawbar power has two components, the pulling force and the speed at which you're moving, multiplied together. Vintage tractors tended to be very heavy for their power and as a result could generate high pulling forces due to having good traction. So, they could pull large implements for their power level but had to move relatively slowly while doing it. Modern tractors have a lower weight per horsepower ratio which favors higher speed operation due to not being able to generate proportionally greater traction for their power. People often focus strictly on the size of the implement but what matters is how many acres you are able to cover in a day. This capacity is directly tied to the amount of drawbar power being produced, regardless of what proportions force and speed are contributing in the equation.
 
19 drawbar vs 84. At best the math works out to 8 bottoms. Also not sure 19 horse is pulling 2-16. Not here and not very deep.

The F20 also had 232 lbs per drawbar horse and the 806 had 141. Weight the 806 up to the same weight per horse and it might do it.
AaronSEIA
 
The 806 may have 4+ times the horsepower, but it is only 2 times as heavy.

If the 806 weighed 18000lbs it could probably pull 8-10 bottoms at 2.3MPH in the same conditions that the F-20 pulls 2 at 2.3MPH.

Those old giant "traction engine" type tractors could pull an amazing number of bottoms with surprisingly little horsepower. Weight and gearing.

As it is, an 806 can pull 5 bottoms at twice the speed that the F20 pulls two, so it is getting far more work done in the same amount of time.
 
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