# Calculate power lossess against road gradients

1. Nov 21, 2009

### Carvinos

i want to calcculate the power lossess of a 60 cc single cylinder water cooled engine against the 5% road gradients.can any one help?

2. Nov 21, 2009

### Staff: Mentor

Welcome to the PF.

What is the context of your question? What vehicle is this small engine in? What speed is the vehicle moving? Is this just a paper calculation, a simulation, or do you intend to build it for a school project?

3. Nov 21, 2009

### Mech_Engineer

To calculate the power required to drive up a hill at a certain speed, calculate the vehicle's vertical speed (speed*grade), and then multiply by the vehicle's mass and G. The engine's dispplacement and cooling are not relevant in this problem.

$$V_{h}=V_{tot}*Grade$$

$$P_{req}=M*g*V_{h}$$

4. Nov 23, 2009

### Carvinos

thnx for ur response.this is basically a school project and we have to build a three wheeler car, 2 wheels at the front and one at the rear and it is to be driven at 30kmph.thnx alot once again.

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