Tractors were rated to pull oversize plows. Take the all fuel John Deere A, 41 to 52 rated at 29 MAX PTO HP and was rated for 3-14" or 2-16". Around here in northwest Ohio 2-12" for that tractor. Now the 47-52 gas version at 38HP will handle a 3-12" OK. I figure 13 HP for a 12" bottom, 15 HP for a 14" bottom so that 3-14" that they rated tractor at 29 for actually needs 45 or the 2-16 actually needs 40 HP as a 16" bottom needs 20 HP per bottom. Remember the 12" bottom is designed to plow 6" deep, the 14" bottom if for 7" deep so you not only have a 2 x 7" on extra width but a 1 x 12" strip extra across bottom so you are turning a total of 72 square inches with the 12", 98 square inches with the 14" and 128 square inches with a 16" bottom and with an 18" bottom 162 square inches. So not only does the extra width take more power you are also with the wider bottoms going deeper so there it also takes extra power. If you could stay the same 6" deep with the 14" or 16" bottom it would stay theoriticly the same 1 horsepower per inch width of cut but that 1 HP per inch of cut is on the low side. Very easy plowing you could get by with that. Better for that 2-12" plow would be 28 HP, not 24 but go to a 3 bottom and it takes less per bottom to pull as less power to move the outfit per bottom, 4 would take less per bottom than the 3 and so on. The 9N Ford was 23 HP so it with a mounted plow and a lighter weight unit could do about the same with that 2-12" as the 28 HP Deere with a 2-12" drag type because of the different weight. That is Why the NAA Ford at 32 HP could pull the 3-12" about the same as the 38 HP Deere with the same size 3-12" on 38 HP.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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