WING CHARACTERISTICS 15 



The Question of Correcting k c . The value of k c only comes 

 into the performance calculations of an aeroplane in determining 

 the difference between the lift of the wing and the weight of the 

 machine due to the vertical component of load on the tail. In 

 other words, k c is only used in evaluating a correction, hence 

 corrections on k c are really of the nature of corrections on a 

 correction, and can therefore be neglected. It follows that we 

 can take the values of k c obtained on a standard test as being 

 near enough for our purpose. 



The above sufficiently explains the principles on which to 

 obtain the wing characteristics, that is to say, the value of k^ max 

 corrected, the corrected values of L/D at each value of X from 

 *i to I-Q and the uncorrected values of k c for these values of X. 



The employment of the wing characteristics in the machine 

 performance calculation will appear in due course. 



