70 Miracles Ahead! 



upper wing can be released for rotation like the blades of the 

 helicopter. This upper wing is specially designed so that when 

 whirling it presents the same shape in cross section both com- 

 ing and going. The newest Convertaplane design eliminates 

 the bottom wing thus making the ship a full-fledged helicop- 

 ter when the rotor wing is turning, and an airplane with no 

 trace of helicopter about it when the rotor wing is locked 

 crosswise for high-speed flight. Future models of this ship also 

 will be equipped so they can be converted into an automobile 

 for short trips about town. 



Mr. Herrick promises that the postwar Convertaplane will 

 let you have your cake and eat it too. You might want a 

 high-speed plane for cross-country trips, while your wife 

 argues for a helicopter to use for shopping trips and visits to 

 friends in the next county. Both can be satisfied by this half- 

 helicopter-half-plane. 



New Light Planes 



Like the many thousands of young fliers in the armed forces 

 who will be returning to civilian life after the war, you may 

 prefer a regular plane for pleasure flying and your chief 

 interest in a "flying flivver" is price. 



William Stout believes the low-cost plane depends on the 

 development of a hundred-dollar, hundred-horsepower, hun- 

 dred-pound aviation engine with cylinders arranged in the 

 "flat-opposed" style for greater streamlining. Stout proposes 

 a two-speed propeller to help the engine get the plane into 

 the air quickly. Combat planes use adjustable-pitch hydro- 

 matic or electric propellers, which are about as complicated 

 as an ordinary auto engine and hence too expensive for the 

 low-cost, light plane. 



W. T. Piper, of the Piper Aircraft Company, favors lower- 

 powered engines of fifty to ninety horsepower, which will 



