BE 150
Gearbox II: Engine RPM
Knowns:
wheel radius = 13/2 = 6.5 in.
sidewall height = 0.8*165 mm = 5.2 in.
total radius = 11.7 in.
car speed = 65 mph = 1144 in/s
differential gear ratio = 37:13
engine gear ratio (4th gear) = 1:1
Calculations:
Velocity = Angular velocity * Radius
(1144 in/s) = W * (11.7 in)
W = 97.778 rad/s
37/13 = (Angular velocity of engine gear) / (97.778 rad/s)
We = 278.3 rad/s = 2657 rev/min
Answer: 2657 RPM
Gearbox I: Gear Ratios
|
Reverse |
1st |
2nd |
3rd |
4th |
| Input |
-3.57 |
3.57 |
2.00 |
1.39 |
1.00 |
| Output |
1 |
1 |
1 |
1 |
1 |
by Ian Cackler & Amanda Holman