Hi boxkite
This is what I got on the Saficopter. Hope it helps.
single-seat helicopter
one 40hp Continental A40 piston engine
estimated max. speed 85 mph, cruise 65 mph, range 220 miles
rotor diameter 25ft
DETAILS: The Safti-Copter X502 light helicopter with contra-rotating rotors was designed in the USA by Mr. Leonard E. Mueller. Emphasis in the design was on an easy construction and economic operation. A prototype aircraft was completed in 1945 or 1946 and this had one 40hp Continental A40 engine. Possibly the aircraft was not flight tested. A larger 2-seat version, with one 90hp engine, was not built. Development of the X502 was soon halted.
Production: 1
The photo caption is the same in the English version of the book (same page number): http://www.amazon.com/History-Helicopter-told-pioneers-1907-1956/dp/B001IY7OVU
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