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Claus 
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 Topic: Plowing Question
Posted: 29 Jan 2010 at 9:08pm |
I was looking at a book of mine on Caterpillar, there is a copy of an old add in there for Best Tractor from the early 1900's. It shows a drawing of a Best 50 (50 hp) steam tractor pulling 16 10" plows. How come that 50hp and a D17 is not the same? Is it the weight, wheels or something else?
Did they not rate HP the same back then?
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SCPAAndy
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Posted: 29 Jan 2010 at 9:21pm |
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tons of variables but mostly final ratio of the transmission and rear end once power gets to the ground plus depth of plow, soil etc......
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Ryan Renko
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Posted: 29 Jan 2010 at 9:42pm |
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That was a great question!!! I want to learn more also. Ryan
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kip in cny
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Posted: 29 Jan 2010 at 9:50pm |
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weight and tracks. Its the same reason my HD-3 will skid logs out of the woods that I couldnt pull with my 160.
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160 CA 920diesel 5020 HD-3
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Tracy Martin TN
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Posted: 29 Jan 2010 at 9:52pm |
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Steam power is a super force. The ratio of power is formidable. I can't remember but 1 quart of steam under pressure, turns to I think 18,000 once it is out of the cylinder in the air. Almost infinite power in the right conditions. I am sure that if dynoed today, it would present more than 50 HP. Tracy Martin
Edited by Tracy Martin TN - 29 Jan 2010 at 9:52pm
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Pat the Plumber CIL
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Posted: 29 Jan 2010 at 10:01pm |
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Ground Speed,Weight,Size of Plow(12"14"16"18")angle of plow,type of soil.Put a 50 HP Allis Engine in a Crawler it could do the same.
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You only need to know 3 things to be a plumber;Crap rolls down hill,Hot is on the left and Don't bite your fingernails
1964 D-17 SIV 3 Pt.WF,1964 D-15 Ser II 3pt.WF ,1960 D-17 SI NF,1956 WD 45 WF.
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Claus
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Posted: 29 Jan 2010 at 10:05pm |
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This was not a crawler, it was a steam tractor. Also said it was pilling the plow at 3 mph, Fresno County Ca.
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B26240
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Posted: 30 Jan 2010 at 7:39am |
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Steam power rateing was before Nebraska testing and was concidered " nominal " or in this case what about 50 horses could pull.
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DMiller
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Posted: 30 Jan 2010 at 7:51am |
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It is hard to rate a steam engine, the pressure varies, the rate of delivery varies, a great deal of variables along with gear train etc.
Steam expands at 1300-1, for every 1 pound of water by volume there is a 1300 times that area for 1 pound steam, a really hot boiler can deliver a lot of steam by volume while a cooler one will deliver 'enough'.
I work in a steam power station, sorry in advance if I get too technical at times.
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DMiller
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Posted: 30 Jan 2010 at 7:52am |
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My own question:
I have a ageing 180 dsl, what would be a good sized disc and will discing a field ready it enough for planting from being pasture?
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Don(MO)
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Posted: 30 Jan 2010 at 8:31am |
 B26240 wrote:
Steam power rateing was before Nebraska testing and was concidered " nominal " or in this case what about 50 horses could pull. |
I'm with you on this one.
Don
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3 WD45's with power steering,G,D15 fork lift,D19, W-Speed Patrol, "A" Gleaner with a 330 corn head,"66" combine,roto-baler, and lots of Snap Coupler implements to make them work for their keep.
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firebrick43
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Posted: 30 Jan 2010 at 1:11pm |
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Remember to that power required plow to a point goes up exponentially as speed is increased, ie a 100 hp tractor cant necessarily plow twice as fast as a 50 hp tractor.
Weight makes a huge difference in traction.
Also, as some one mentioned, a horse power is not always a horse power. The difference in work that an 1hp electric motor/gas motor/diesel motor/steam/horse are all different. Old hp ratings were more of a continous all day type rating. For example. A mid size draft horse can pull 1 10" bottom most of the day, but for very short times can put out enough momentum/tractive power to pull loads that only a 40 hp tractor can put out. But again short burst.
Also most steam engines and early combustion engines had huge flywheels which could store an amazing amount of reserve power for those hard spots.
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Brian Jasper co. Ia
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Posted: 30 Jan 2010 at 1:21pm |
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The torque produced by a steam engine is higher than even a diesel engine too isn't it? As long as the valve is open and steam is pressing on the piston, it is producing more torque right? Then there is the return stroke that produces power too instead of only one power stroke per 2 revolutions of the crank.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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firebrick43
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Posted: 30 Jan 2010 at 1:38pm |
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Can be Brian, depends all on the engine. Some are single acting(steam in one direction only, others(most larger ones) are double acting, steam on both sides of piston. Steam can have tremendous power at start up, more than sometimes the mechanisms can take if you are not careful. Steam locomotives where hard to control because you could easily slip the wheels, typically wouldn't/couldn't put full power down until up to a pretty good clip because of this.
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