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Old 05-25-2012, 08:43 AM   #1 (permalink)
RobertSmalls
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Boeing 787 Aerodynamic Report

Boeing 787 Dreamliner : Analysis

I came across this breakdown of aerodynamic drag and mass for the Boeing 787-8. This vehicle has a 33,000 gallon fuel tank, and seats 224 passengers. It gets 0.3mpg at 560mph, or around 67 passenger*mi/gal. That's slightly worse than an Insight with one empty seat, but the aircraft can travel in a straighter line.

Code:
 Zero-Lift Component Breakdown (Drag Areas,= Cd*S = D/q)
 -----------------------------

 Wing                   18.313  sq.feet    (37.0 %)
 Winglets                0.143  sq.feet    ( 0.3 %)
 Fuselage & fairing     19.367  sq.feet    (39.2 %)
 Stabiliser              4.049  sq.feet    ( 8.2 %)
 Fin                     2.975  sq.feet    ( 6.0 %)  
 Nacelles (total)        4.591  sq.feet    ( 9.3 %)
 User CdS Increment      0.000  sq.feet    ( 0.0 %)
                       -------             --------
 Total Cd0*S            49.438  sq.feet    ( 100 %)
In other words, this aircraft has the aerodynamic drag of ten Honda Insights*.

The good news is that aircraft are very carefully designed, with fuel economy as a very high priority. All components, even interior ones, are scrutinized for their impact on fuel economy.

The bad news is air travel makes it easy, if not cheap, for a family of five to pile into a 787 and fly across the country, burning 400 gallons of fuel in the process. If air travel were not available, perhaps they'd pile into the Prius for a 15 hour trip, burning 20 gallons instead.


*sort of. That's the 787's non lift-induced drag, which is only 52% of the drag it sees in flight. Also, the Insight is operating in ground effect. Its drag coefficient would be lower if the road weren't blocking the flow of air.

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