[AT] Horsepower Question

[charlie hill]

Yes

--------------------------------------------------
From: "Ben Wagner" <supera1948 at gmail.com>
Sent: Wednesday, October 06, 2010 8:23 PM
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Subject: Re: [AT] Horsepower Question

>  On 10/6/2010 11:47 AM, Will Powell wrote:
>> Ben,
>>
>> You said:
>>
>> "So in reality, horsepower is not really the important number; torque and
>> RPM is what matters?"
>>
>> The Torque and the RPM are variables in the HP calculation... Tourque and 
>> RPM matter based on their application.
>>
>> High HP low torque = Light engine, good for lawn mowers, automobiles, 
>> race cars, airplanes, usually high ware, shorter service life. Cheaper to 
>> build?
>>
>> High Tourqe, Low RPM = Heavy engine, good for Trains, Tractors, Trucks, 
>> excavating equipment. Applications that welcome weight for pulling or 
>> pushing. Low wear, long service life. More expensive to build. (more 
>> metal)
>>
>>
>> The other factor that makes things different between a lawn tractor and a 
>> farm tractor is weight...
>> The main measure of a tractors pulling strength is related to its 
>> weight... Try pulling a 1 row plow with your 20hp lawn tractor......
>>
>> Regards,
>>
>> Will
>>
>>
>> ----- Original Message -----
>> From: "Ben Wagner"<supera1948 at gmail.com>
>> To: "Antique tractor email discussion 
>> group"<at at lists.antique-tractor.com>
>> Sent: Wednesday, October 6, 2010 10:17:32 AM
>> Subject: Re: [AT] Horsepower Question
>>
>> On 10/6/2010 10:00 AM, charlie hill wrote:
>>> Ben, the lawn mower engine is rated in gross hp with no drive train 
>>> load.
>>> The tractor engine is rated at net hp, either at the wheels or the PTO.
>>> There may well be some fudging on the lawn mower engine as well. Also, 
>>> HP
>>> is torque in ft/lbs. times RPM. You can make hp with high rpms and low
>>> torque or high torque and low rpm. Your tractor is high torque and low
>>> rpm. that is what allows it to move a load easily.
>>>
>>> Charlie
>>>
>>> --------------------------------------------------
>>> From: "Ben Wagner"<supera1948 at gmail.com>
>>> Sent: Wednesday, October 06, 2010 9:00 AM
>>> To: "At"<at at lists.antique-tractor.com>
>>> Subject: [AT] Horsepower Question
>>>
>>>> Here is a puzzler that maybe someone with a better knowledge of
>>>> engines can answer. I was asked this question, and had to announce
>>>> that I needed to look it up. What better place than the AT Mailing?
>>>>
>>>> I have a Super A with four cylinders, producing c. 20 HP.
>>>>
>>>> I have a lawnmower, with an engine that says it is also 20 HP, with 
>>>> only
>>>> two cylinders.
>>>>
>>>> What is going on? Is this two different measures of HP? Or has
>>>> technology improved that much? What makes a little two cylinder "small
>>>> engine" have the same HP as four cylinder "tractor" engine.
>>>>
>>>> Thanks,
>>>> Ben Wagner
>>>>
>>>>
>>>> _______________________________________________
>>>> AT mailing list
>>>> http://www.antique-tractor.com/mailman/listinfo/at
>>>>
>>> _______________________________________________
>>> AT mailing list
>>> http://www.antique-tractor.com/mailman/listinfo/at
>> So in reality, horsepower is not really the important number; torque and
>> RPM is what matters?
>>
>> Ben Wagner
>> _______________________________________________
>> AT mailing list
>> http://www.antique-tractor.com/mailman/listinfo/at
>> _______________________________________________
>> AT mailing list
>> http://www.antique-tractor.com/mailman/listinfo/at
> Thank you, everyone, for your replies.  I will have a better
> understanding know of the horsepower issue now, so I think my friend
> will have his answer.
>
> As for the weight in pulling power, is that why in tractor pulls the
> classes are defined by weight?
>
> Thanks,
> Ben Wagner
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at
>