UK Karting - Notice Board (General Karting) : Re: bhp or torque

Notice Board (General Karting)

Re: bhp or torque
Posted by 'davidmc' on 18 Aug 2009 @ 23:41

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davidmcJoined: April 2003
Total Posts: 2
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Remembering torque and HP are derivations of one another:

For a vehicle with infinite gears (imaginary CVT), maximum acceleration is obtained by operating the engine at peak power.

For a vehicle with finite gears, maximum acceleration at a GIVEN SPEED is obtained by selecting the gear that puts you at the revs highest in the power band. Maximum acceleration IN ANY GIVEN GEAR is at the torque peak.

It therefore follows that, for a vehicle with 1 gear (a non-geared kart for instance), maximum acceleration at a GIVEN SPEED is obtained by staying in the gear your in (no other is available, obviously). Maximum acceleration IN ANY GIVEN GEAR (i.e. the only one you've got) is at the torque peak.

Just work back the using the formulae below. Just remember that, because our gearing is fixed, speed and rpm are fixed by a constant and therefore speed and power are fixed by a constant:

Force = Power / Speed
Force = Mass * Acceleration

Or instead, work it back based on kinetic energy E = 1/2 mv^2

The "twice the bangs" aren't accelerating you faster, you're simply moving faster.

Dave

Message Thread:

bhp or torque by 'KJM' (17 Aug 2009 @ 17:31)

Re: bhp or torque by 'davidmc' (17 Aug 2009 @ 17:46)

Re: bhp or torque by 'PaulMRotax' (17 Aug 2009 @ 18:30)

Re: bhp or torque by 'davidmc' (17 Aug 2009 @ 19:20)

Re: bhp or torque by 'QuickOldTimer' (17 Aug 2009 @ 19:20)

Re: bhp or torque by 'davidmc' (17 Aug 2009 @ 19:22)

Re: bhp or torque by 'KJM' (17 Aug 2009 @ 19:38)

Re: bhp or torque by 'QuickOldTimer' (17 Aug 2009 @ 22:44)

Re: bhp or torque by 'davidmc' (18 Aug 2009 @ 0:14)

Re: bhp or torque by 'QuickOldTimer' (18 Aug 2009 @ 9:49)

Re: bhp or torque by 'davidmc' (18 Aug 2009 @ 13:05)

Re: bhp or torque by 'QuickOldTimer' (18 Aug 2009 @ 13:51)

Re: bhp or torque by 'davidmc' (18 Aug 2009 @ 15:10)

Re: bhp or torque by 'QuickOldTimer' (18 Aug 2009 @ 15:43)

Re: bhp or torque by 'davidmc' << You are here!

Re: bhp or torque by 'QuickOldTimer' (18 Aug 2009 @ 23:57)

No ! , the original qustion was... by 'Chads' (19 Aug 2009 @ 0:58)

Re: No ! , the original qustion was... by 'QuickOldTimer' (19 Aug 2009 @ 1:11)

Re: No ! , the original qustion was... by 'davidmc' (19 Aug 2009 @ 8:36)

Re: No ! , the original qustion was... by 'QuickOldTimer' (19 Aug 2009 @ 11:31)

Re: No ! , the original qustion was... by 'davidmc' (19 Aug 2009 @ 12:27)

Re: No ! , the original qustion was... by 'Hi99' (19 Aug 2009 @ 19:15)

Re: No ! , the original qustion was... by 'TanglerTKM' (19 Aug 2009 @ 22:48)

contd by 'TanglerTKM' (19 Aug 2009 @ 22:51)

Re: contd by 'davidmc' (19 Aug 2009 @ 23:57)

Re: No ! , the original qustion was... by 'davidmc' (19 Aug 2009 @ 23:40)

Re: No ! , the original qustion was... by 'Hi99' (20 Aug 2009 @ 20:13)

Davidmc is this correct? by 'Hufggfg' (21 Aug 2009 @ 8:33)

Re: Davidmc is this correct? by 'davidmc' (21 Aug 2009 @ 9:57)

Re: Davidmc is this correct? by 'Hufggfg' (21 Aug 2009 @ 12:02)

Re: Davidmc is this correct? by 'davidmc' (21 Aug 2009 @ 13:07)

KJM, your best means of altering .. by 'Chads' (18 Aug 2009 @ 2:13)

Re: KJM, your best means of altering .. by 'KJM' (19 Aug 2009 @ 9:39)

David, that doesn't make sense by 'Booney' (19 Aug 2009 @ 23:19)

Re: David, that doesn't make sense by 'davidmc' (19 Aug 2009 @ 23:53)

Maximum accel is at max torque by 'PhilOwen' (20 Aug 2009 @ 17:28)

Re: Maximum accel is at max torque by 'QuickOldTimer' (20 Aug 2009 @ 20:59)

Re: QOT by 'John' (20 Aug 2009 @ 22:18)

Re: QOT by 'QuickOldTimer' (20 Aug 2009 @ 22:26)

Re: QOT by 'John' (20 Aug 2009 @ 23:51)

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