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Re: Horsepower Question
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Posted by Hugh MacKay on March 07, 2007 at 14:51:05 from (209.226.247.133):
In Reply to: Re: Horsepower Question posted by Bob M on March 07, 2007 at 07:50:46:
Bob: On the subject of PTO hp being basically flywheel hp, I will agree with you to a point, that point being when we started getting IPTO, live hydraulics, power shifts, power steering, etc. Most experts will tell you the modern day Deere or CaseIH loose close to 10% of flywheel hp when delivered to PTO shaft, and even more at drawbar. For example the lowly Farmall A and SA, IH never had the SA tested at Nebraska. Most folks will tell you that due to live hydraulics the SA really never delivered as much hp to PTO or wheels as the A did, and that is precisely why it was never tested. IH decided to let rest on the A record. A lot of farmers that owned both will tell you the A actually had an edge. I don't know as I ever knew the exact particulars, however a 300 with TA, IPTO and live hydraulics was another prime example. I expect most of the loss came from IPTO. I do know that back in the 50s if one was plowing or disking and disconnected the seasonal disconnect on the belly of the tractor for IPTO, it was noticable on drawbar pull.
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