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Old 11-18-2012, 02:25 PM   #71 (permalink)
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Thanks aerohead!
I will use this as a good guideline.

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Old 12-02-2012, 04:17 AM   #72 (permalink)
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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.
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Old 12-30-2012, 02:24 AM   #73 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
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
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Old 12-30-2012, 08:52 PM   #74 (permalink)
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Hi Carter -

Unfortunately, that spreadsheet was hosted by someone else, offsite. It's apparently gone.
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Old 12-31-2012, 04:33 AM   #75 (permalink)
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Thanks Metro.

I thought it was you excel.

Thanks for making the online tool. Very helpful

HAPPY NEW YEAR

Carter
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Old 12-31-2012, 01:32 PM   #76 (permalink)
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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.
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Old 01-02-2013, 09:12 PM   #77 (permalink)
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how to calculate power at a given speed

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
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Old 01-05-2013, 04:57 PM   #78 (permalink)
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power

Quote:
Originally Posted by CarterX27 View Post
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.
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Old 01-13-2013, 11:28 PM   #79 (permalink)
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Thanks Aerohead.

After seeing your post, i double checked my calculation and found out that i was using mph instead of m/s.
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Old 01-29-2013, 02:22 PM   #80 (permalink)
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Nice calculator

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