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#11
August 18th 07, 11:13 PM
posted to rec.aviation.piloting,rec.aviation.homebuilt,rec.aviation.ultralight,rec.aviation.soaring
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Electrically Powered Ultralight Aircraft
("Charles Vincent" wrote)
According to SAE studies, aerodynamic drag accounts for 60% of the resistance that must be overcome for highway cruise, with tires being 25% and driveline friction making up the last 15%. Semi: Tires ........... 18 Footprint ..... big per tire Weight ....... 80,000 lbs Drag .......... HUGE!! MPG .......... 5 (loaded) Minivan: Tires ........... 4 Footprint ..... smaller per tire Weight ....... 4,000 lbs (for easy math) Drag .......... MUCH less + no cab/trailer drag MPG .......... 22 I've never really understood why an 800 lb motorcycle/rider gets (only) 50 mpg and a fully loaded semi can get (about) 5 mpg? Motorcycle: Tires ........... 2 Footprint ..... very small per tire Weight ....... 800 lbs (with rider) Drag .......... It's a motorcycle! g MPG ........... 50 Paul-Mont 
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