- #1
Sentient
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Apologies in advance if this is not the correct forum.
This is (what seems to me) an old question people have been playing with for a while, but I don't seem to be able to figure out where I have gone wrong.
Could someone point out the mistake in my math from the following example:
Constant Mass = 1180Kg
Sample 1 @ 2 secs
Kilometers/Hour = 37
Meters/Sec = 10.278
RPM = 3000
Sample 2 @ 3 secs
Kilometers/Hour = 46
Meters/Sec = 12.778
RPM = 3780
Sample 3 @ 4 secs
Kilometers/Hour = 59
Meters/Sec = 16.389
RPM = 4860
Using the formula: KE = (1/2)(m)(v^2) I calculated
KE1 = 0.5 * 1180 * (10.278 * 10.278) = 62326 ??Joules??
KE2 = 0.5 * 1180 * (12.778 * 12.778) = 96333.6 ??Joules??
KE3 = 0.5 * 1180 * (16.389 * 16.389) = 158473.6 ??Joules??
Using the formula: W = (KE / Time) given the sampling time is 1sec
W = KE.
Converting (roughly) from W (watts) to HP: HP = W / 746
HP1 = 83.54
HP2 = 129.12
HP3 = 212.32
I know from another piece of software that the correct values should be:
HP1 = 59
HP2 = 76
HP3 = 105
Could someone be kind enough to point out my fault. Greatly appreciated.
Tony
This is (what seems to me) an old question people have been playing with for a while, but I don't seem to be able to figure out where I have gone wrong.
Could someone point out the mistake in my math from the following example:
Constant Mass = 1180Kg
Sample 1 @ 2 secs
Kilometers/Hour = 37
Meters/Sec = 10.278
RPM = 3000
Sample 2 @ 3 secs
Kilometers/Hour = 46
Meters/Sec = 12.778
RPM = 3780
Sample 3 @ 4 secs
Kilometers/Hour = 59
Meters/Sec = 16.389
RPM = 4860
Using the formula: KE = (1/2)(m)(v^2) I calculated
KE1 = 0.5 * 1180 * (10.278 * 10.278) = 62326 ??Joules??
KE2 = 0.5 * 1180 * (12.778 * 12.778) = 96333.6 ??Joules??
KE3 = 0.5 * 1180 * (16.389 * 16.389) = 158473.6 ??Joules??
Using the formula: W = (KE / Time) given the sampling time is 1sec
W = KE.
Converting (roughly) from W (watts) to HP: HP = W / 746
HP1 = 83.54
HP2 = 129.12
HP3 = 212.32
I know from another piece of software that the correct values should be:
HP1 = 59
HP2 = 76
HP3 = 105
Could someone be kind enough to point out my fault. Greatly appreciated.
Tony