Posted by LenNH on October 28, 2010 at 14:52:48 from (24.128.163.35):
In Reply to: F-20 high speed 4th posted by oldiron29 on October 27, 2010 at 03:32:04:
The original F-20 steel wheels were 40", but 36" rubber gave a larger-diameter wheel. Once, many years ago when I was an eager whippersnapper, I actually ran an F-20 on 36" tires next to an F-12 (40" rubber). The F-20 was almost as fast in second as the F-12 in 3rd. I estimated at that time that 4th gear gave around 5 mph, maybe a little more with the engine at high idle. Recently, I saw a table that shows the effects of rubber tires on these tractors, and it turns out my guess was pretty close (just under 5 mph in 4th gear at governed load speed). Will look for this table among my papers, and will pass it on when I find it. One interesting thing that was immediately apparent to anybody who ever spent much time on steel-wheeled tractors is that steel wheels waste probably a third of the engine power, while rubber tires lose quite a bit less--maybe 15%, even less today with improved tires (I had about 10 years on 3 steel-wheeled tractors--an F-12, a 10-20 and an early Oliver Row-Crop). If you're an armchair engineer, you can dig out the Nebraska tests and compare a number of tractors. What is absolutely wonderful is to find the same tractor tested on each type of wheel--there are a few (F-12 was on steel, F-14, as I remember, on rubber; the percentages of loss should be the same for either tractor). My original point is that with rubber tires, an F-20 would pull at nearly 4 mph (36" rubber, second gear) what it had originally pulled at 3 mph on steel; less power wasted meant the tractor could pull more. A neighbor had had a steel-wheeled F-12, which he thought pretty anemic. When he borrowed my father's F-12 on 40" rubber, he was amazed at what it would do. We always pulled a 7-foot double-disc, which had come with the '29 10-20 we had on the farm. The F-12 shouldn't have been able to handle that disc, but it did.
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