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Drag and prop efficiency real-world examples?

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cluttonfred

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Hi, I like messing around with the LAA's preliminary design spreadsheets available here -- http://www.lightaircraftassociation.co.uk/2010/Engineering/Design/preliminary_design.html -- but I am dubious of some of the numbers. The completed sample spreadsheet used these numbers for prop efficiency and drag:

  • Propeller efficiency at take-off 70%
  • Propeller efficiency in the climb 75%
  • Propeller efficiency in the cruise 85%
  • Cd (profile) 0.01
  • Cd (parasite) 0.015 (Speeds between 1.1 Vs and 2.7 Vs)
Does anyone know of a source of sample data for these and other factors for real-world aircraft? That way if I'm messing around with ideas for a tandem-seat, rag-and-tube taildragger, for example, I could use actual numbers from a Piper PA-18 Super Cub. I don't need hundreds of examples, just one each for various types of light aircraft.

Cheers,

Matthew
 
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