text: (A) The elliptical planform has constant 
  local lift coefficients throughout the span from 
  root to tip. Such a lift distribution means that 
  all sections will 
  reach stall at essentially the 
  same wing angle of attack and stall will begin 
  and progress uniformly 
  the span. 
  While the elliptical wing would reach high 
  there 
  lift coefficients before incipient stall, 
  would be little advance warning of complete 
  stall. Also, the ailerons may lack effectiveness 
  when the wing operates near the stall and lat- 
  eral control may be difficult. 
  
  throughout 
  
  The elliptical wing is the ideal of the sub- 
  sonic aerodynamic planform since it provides 
  a minimum of induced drag for a given aspect 
  ratio. However, the major objection to the 
  elliptical planform is the extreme difficulty of 
  mechanical layout and construction. A highly 
  tapered planform is desirable from the stand- 
  point of structural weight and stiffness and 
  the usual wing planform may have a taper 
  ratio from 0.45 to 0.20. Since structural con- 
  siderations are quite important in the develop- 
  ment of an airplane configuration, the tapered 
  planform is a necessity for an efficient configu- 
  In order to preserve the aerodynamic 
  ration. 
  is tailored 
  efficiency, the resulting planform 
  by wing twist and section variation to obtain 
  as near as possible the elliptic lift distribution. 