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Old 02-06-2008, 05:41 PM   #1 (permalink)
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Aerodynamics Seminar # 7 - by Phil Knox

This post was originally written by Phil Knox (aerohead), and it first appeared on the MaxMPG group. Phil has done a lot of work educating the masses about the critical role aerodynamics play in efficiency, and has spurred many in the DIY crowd to take matters into their own hands.

This is the seventh in a series which I'm reproducing here with permission.


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Here's a formula that will allow you to estimate the horsepower necessary at the drivewheel to overcome your tires rolling resistance (power absorption).

The formula is for radial tires only,and is for 70-degrees F,smooth road,dry road, proper inflation pressure.

Horsepower HP= V/375 times[0.01184 W + 0.000353(V-66) W].

Velocity V is in miles per hour, Weight W is in pounds.

If your speed is below 66-mph,then the second term within the parenthesis falls out.

Again,to get flywheel power,take your result and divide by 0.95. This yields Bhp the engine or electric motor must provide to the powertrain,at 95% mechanical efficiency for the powertrain.

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Old 02-06-2008, 07:32 PM   #2 (permalink)
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Cool

BTW, I did read your PM - I will be doing a mega post within a few days
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Old 02-06-2008, 11:09 PM   #3 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 60.16 mpg (US)
Thanks: 4,058
Thanked 6,957 Times in 3,602 Posts
Excellent! Looking forward to it.

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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
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