Yes, you are right. My bad.Ken_Parkman wrote: ↑Thu Dec 01, 2022 9:57 pmSorry David this is not the physics. Power = work/time. Above you have the power to lift 3000 lbs 1320 ft strait up in 12 sec.David Redszus wrote: ↑Wed Nov 30, 2022 11:29 pm
HP = Mass x Distance / Time
if:
Mass = 3000 lbs
Distance = 1320 ft
Time = 12 sec, then:
HP = 3000lbs x 1320ft /12sec = 330,000 lbft/s = 600HP
Horsepower is a valid indicator of how much power is needed for a 3000lb car, to cover 1320 ft, in 12 s.
But it does not tell us anything about acceleration in each gear, shift points, traction limits or gear selection.
You really might make a lot of 12 second car owners very happy telling them they have 600 hp, but unfortunately not.
While the equation is correct, (force x distance is work), the input for mass is incorrect.
I based the calc on dragging 3000 lbs for 1320 ft in 12s. Actually, I should have used the rolling force instead of the dragging force. Since the required rolling force is much less, so is the power required.