# Thread: Calculate output power based on speed

1. ## Calculate output power based on speed

I need a way to calculate power output based on known speed given the following curve for the yellow line:
[IMG]file:///C:/DOCUME%7E1/snail/LOCALS%7E1/Temp/moz-screenshot.png[/IMG]

2. Originally Posted by stnail
I need a way to calculate power output based on known speed given the following curve for the yellow line:
[IMG]file:///C:/DOCUME%7E1/snail/LOCALS%7E1/Temp/moz-screenshot.png[/IMG]
Are you asking for the equation of the yellow line?

CB

3. What I am looking for is an equation that will give me the power if I know the speed. This doesn't have to be exact just a close estimate. I can see from the chart that 30MPH = 650 Watts. 0 MPH = 0 watts.

4. Originally Posted by stnail
What I am looking for is an equation that will give me the power if I know the speed. This doesn't have to be exact just a close estimate. I can see from the chart that 30MPH = 650 Watts. 0 MPH = 0 watts.
Try something like $p(v)=0.71 v^2$

CB