From: "Mike Sloane"
> As far as the 12 hp rating, that is the rating at the drawbar, not the
flywheel,
> which is the way modern engine manufacturers rate their engines. That is why
it
> will out pull a modern tractor rated at twice the power.
Don't bet any real money on this, my LAWNMOWER will drag an old Cub backwards!
Below is the universally recognized test of an original Cub . . .9 horsepower
belt (equivalent to PTO) and 6.75 horsepower drawbar. . . they gained a few
horses later in production. Modern tractor manufacturers (serious ones) still
rate their tractors for both drawbar and PTO horsepwer
.
NEBRASKA TRACTOR TEST RESULTS
TEST NO. 386
International Harvester Co., Chicago, Illinois
DATE TESTED: September 29 to October 9, 1947
No repairs or adjustments were noted for the Farmall Cub during 68 hours of
engine operating time required for this test. Equipped with three forward speeds
of 2.14, 3.12, and 6.4 mph, the Cub used second gear for Test H. Under a rated
load of 6.75 drawbar horsepower, it pulled an 837 pound load of 3.02 mph with a
slippage of 5.69%, yielding a fuel economy of 8.6 horsepower hours per gallon
gasoline. A maximum low-gear pull of 1,596 pounds was recorded in Test G - this
test also indicates a speed of 1.96 mph and slippage of 10.98%. At an operating
maximum load of 9.23 belt horsepower, the Cub delivered a 10.94 horsepower hours
per gallon of gasoline, compared to a virtually identical figure of 10.27 at the
Test D rated load of 8.32 belt horsepower. This tractor was equipped with 6-24
rear and 4.00-12 front tires - without additional ballast, it weighed in at
1,477 pounds. Standard equipment included a McCormick-Deering four-cylinder,
L-head engine rated at 1600 rpm and carrying a 2-5/8 x 2-3/4 inch bore and
stroke. Also featured on this model was an IHC J-4 magneto and an IHC
carburetor.
Tony Clark
I have a 1929 15 horsepower tractor that will outpull all 5 of your Cubs
combined!
>
>
>
(1929 Caterpillar Fifteen Ser # PV 429 <-:)
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