Posted by LenNH on November 14, 2009 at 15:39:51 from (71.192.137.159):
In Reply to: H ground speed posted by Tom/Idaho on November 14, 2009 at 12:22:42:
Just to confuse things a bit, I guess, here are the speeds listed in an old IHC sales brochure called The Farmall System of Farming, Farmalls H and M. By the looks of the tractors, I'd guess this was printed about 1941. IHC was always cagey about dating this stuff.Tires for H were listed as 5.50-16 front and 10-38 rear. Ground speeds were 2-5/8, 3-1/2, 4-1/4, 5-3/8 and 15-5/8. The brochure uses fractions, not decimals, so I give these numbers here. I'm too busy or too lazy right now to get out a calculator and go to decimal speeds. There are no notes about engine speed, but my understanding is that it was normal to give ground speeds at full-load governed RPM, which in the case of the H was 1650. Naturally, at high-idle RPM, the ground speeds would go up proportionally. I don't have the high-idle speed at hand, but I think it was in the low 1800s. Perhaps somebody else can supply that number. I used to like to play armchair engineer and calculate things like this. As one of the other notes here says, the tire size would make a difference. I always thought the H on rubber had a 4th gear that just wasn't fast enough for hauling on the road, and that 5th gear was pretty useless for hauling on rough country roads because there wasn't enough torque at idle. The brochure gives "High speed" as 9-1/2 to 15-5/8 mph, which suggests that 9-1/2 was about as slow as the tractor would pull any kind of a load. That was much too fast for the old steel-tired wagons I grew up with. The 7-mph 4th gear option would have been great, because even throttled back just a bit, you'd have had a good ground speed, with a little less noise. I remember driving loads of hay about a mile over a washboard road, with the tractor roaring away and doing somewhere between 5 and 6 mph.
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