Online tool: shows aerodynamic drag, rolling resistance, power required & est. MPG

[88'rolla]

Thanks aerohead!
I will use this as a good guideline.

[MisterInnovation]

I think that it is amazing that 5 feet extra in frontal area means 5 more hp is needed to go 70mph for my motorcycle, while doubling its weight to 466lbs only required half a hp more. I bookmarked the app and will be referencing it several times in my projects to come.

[CarterX27]

Originally Posted by MetroMPG

The formula used can be found in this spreadsheet:

Hi MetroMPG,

Thanks for making a great tool.

this link for your excel is no longer working

Would you please post a new link?

Thanks.

Carter

[MetroMPG]

Hi Carter -

Unfortunately, that spreadsheet was hosted by someone else, offsite. It's apparently gone.

[CarterX27]

Thanks Metro.

I thought it was you excel.

Thanks for making the online tool. Very helpful

HAPPY NEW YEAR

Carter

[mechman600]

Why didn't I know about this tool until now??
Results for my wife's Toyota Matrix coincide ridiculously close to what my scangauge says.

[CarterX27]

Hi,

I understand how the forces are calculated as explained in footnote 7, but I'm not understanding how to calculate power.

I think total power = power drag + power rolling resistance + parasitic loads.

I've used the equations from Pamvec chapter 3 of P = 0.5*rho*Cd*A*v^3 + (Crr * Mtotal * g * v) but it gave me some ridiculously large numbers

What is the formula used in the online tool to calculate power?

Thanks.
Carter

[aerohead]

Originally Posted by CarterX27

Hi,

I understand how the forces are calculated as explained in footnote 7, but I'm not understanding how to calculate power.

I think total power = power drag + power rolling resistance + parasitic loads.

I've used the equations from Pamvec chapter 3 of P = 0.5*rho*Cd*A*v^3 + (Crr * Mtotal * g * v) but it gave me some ridiculously large numbers

What is the formula used in the online tool to calculate power?

Thanks.
Carter

If you have your drag force in pounds,at a given velocity,multiply that by your velocity (MPH) divided by 375 to get your horsepower.

[CarterX27]

Thanks Aerohead.

After seeing your post, i double checked my calculation and found out that i was using mph instead of m/s.

[Bear32LB]

Nice calculator