Prouty, Raymond W. (1958) Part I: A second approximation to the induced drag of a helicopter rotor in forward flight. Part II: The instantaneous induced velocity at the blade of a finite-bladed rotor in forward flight. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-06202005-140259
In Part I, a method is derived for determining the induced drag of a helicopter rotor in forward flight from the distribution of circulation in the wake. Charts of the correction factor to be applied to the ordinary momentum value of induced drag are presented for ranges of flight parameters currently in use.
In Part II, the expression for the instantaneous induced velocity at a blade is developed by application of the Biot and Savart Law to a helical wake surface on which the circulation distribution varies both with radius and with azimuth in a manner corresponding to the actual lift distribution on the blade.
|Item Type:||Thesis (Engineer's thesis)|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1958|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||20 Jun 2005|
|Last Modified:||26 Dec 2012 02:53|
- Final Version
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