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rusty
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December 2002
Re: TORQUE Tue, 24 June 2003 08:33 Go to previous messageGo to previous message
oldcorollas wrote on Tue, 24 June 2003 17:17


what you forget to mention is gearing. your electric motor idea. one motor, 1Nm@1000rpm, second = 1Nm@20000rpm. the second motor does indeed have more power, but if connected thru the same gearing, will have the same accelerative force at the wheels as the first motor.

to use power effectively, you have to take advantage of GEARING.



very true, so far. but you shot yourself in the foot there, as you seem to have forgotten to examine what happens when you gear the car so both those cars with their respective rpm are at the same "road speed"? when you drop the flag the car with the gearing set for the motor to turn 20,000rpm will leave the other car for dead. but the engines of both are still making only 1Nm.

remember, torque has no motion. torque is simply twisting force. with motion comes power.

if torque was all important, the f1 boys wouldnt bother with the huge hassle of engineering a motor to turn over 18,000rpm (theyre close to 19,000rpm this year).

but they have a gearbox with more than 1 gear Smiley = plus they know that power is what moves the car.

oldcorollas wrote on Tue, 24 June 2003 17:17


the power issue is misinterpreted by many ppl to be most important. a famous quote(and i can't even remember who said it now..) was "power sells cars, torque wins races" and that is true.



actually its not Smiley = there are many sayings in the automotive world. another is that "there is no replacement for displacement". i wonder if you ascribe to that one also?

oldcorollas wrote on Tue, 24 June 2003 17:17


BUT, for the same car speed, the F1 motor will have a GEARING advantage of 3:1 over the normal car engine, and so the TORQUE AT THE WHEELS will be 3 times higher, so for a given car mass, will accellerate 3 times faster.



it perplexes me that you mistake power for torque above, yet go on to state the following ....

oldcorollas wrote on Tue, 24 June 2003 17:17


two cars with identical POWER at different rpm, at the same road speed, will accelerate at the same rate, since GEARING multiplies the torque of the motor with higher rpm at same power.



clearly power is accelleration, not torque. you even said it yourself.

ever wonder why engineers look at power to weight, to gauge performance, and car mags list power to weight among a cars spec? because acceleration is the result of power to weight. and because torque to weight is irrelevant Smiley =

i occasionally marvel that such a simple issue as this is so commonly misunderstood. the reason is that a lot of people with only a loose grasp of the concepts try to explain on forums such as these, yet keep contracdicting themselves. its no wonder then that the novice becomes confused.
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Read Message   TORQUE BAD22Sat, 21 June 2003 04:43
Read Message   Re: TORQUE oldcorollasSat, 21 June 2003 07:20
Read Message   Re: TORQUE trent_kershawSat, 21 June 2003 09:52
Read Message   Re: TORQUE wilbo666Sat, 21 June 2003 12:29
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Read Message   Re: TORQUE gianttomatoSun, 22 June 2003 02:18
Read Message   Re: TORQUE rustyMon, 23 June 2003 19:37
Read Message   Re: TORQUE BAD22Tue, 24 June 2003 01:57
Read Message   Re: TORQUE oldcorollasTue, 24 June 2003 07:17
Read Message   Re: TORQUE  rustyTue, 24 June 2003 08:33
Read Message   Re: TORQUE oldcorollasTue, 24 June 2003 09:32
Read Message   Re: TORQUE gianttomatoTue, 24 June 2003 09:42
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Read Message   Re: TORQUE and shite stirring oldcorollasWed, 25 June 2003 12:27
Read Message   Re: TORQUE and shite stirring oldcorollasWed, 25 June 2003 12:36
Read Message   Re: TORQUE boudanThu, 26 June 2003 00:37
Read Message   Re: TORQUE baykaWed, 25 June 2003 17:41
Read Message   Re: TORQUE NorbieWed, 25 June 2003 22:37
Read Message   Re: TORQUE dar_sbbThu, 26 June 2003 01:58
Read Message   Re: TORQUE baykaThu, 26 June 2003 05:49
Read Message   Re: flat TORQUE curves oldcorollasThu, 26 June 2003 06:23
Read Message   Re: flat TORQUE curves NarkThu, 26 June 2003 06:45
Read Message   Re: flat TORQUE curves oldcorollasThu, 26 June 2003 07:03
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