satisfied if i = 2p, the middle pair of Equations [4] become 



^\J 2 3 ' ^^ 2 3 



Values of the parameters defining the final configuration 

 are given in Table 1, and the resulting geometry is shown in 

 Figure 3 in the body of the report. 



The gravitational force and moment were then estimated 

 to verify that the values initially estimated could be obtained 

 with reasonable volume of ballast, Th:fe was found to be the 

 case. 



Since considerable uncertainty attends the prediction 

 of the downwash angle, provision must be made for adjusting 

 the horizontal stabilier incidence o As it is not convenient 

 to adjust the entire stabilizer assembly, an elevator should 

 be provided for this purpose. 



The uncertainty in the actual effective value of the 

 downwash is, at most, e . From Table 1, JJ^ =0.75, Therefore 



^n = ^ =f^= 0-0734 

 o ttA 3 . 25Tr 



=4,2 degrees. 



The elevator must thus provide for a minimum rotation of the 

 horizontal stabilizer zero-lift-line of + 2.1 degrees. 

 For design purposes, we shall arbitrarily triple the required 

 range by requiring a shift in the horizontal stabilizer 



72 



