Boeing 720B
Boeing developed the 720 and 720B as a smaller,
lighter and faster derivate of the 707. In the 1960s a total of 154 of this
medium-range aircraft was built.
Despite its four engines the 720B is not a very
big modelplane. Flight characteristics are nearly the same as for the larger
707. As the real aircraft the model is somewhat overpowered.
Powerplant: Glow: four 6.5 cc
(.40 cu.in.) engines
Turbine: twice
45 N (10 lbs.) thrust
four times 23 N (5 lbs.)
thrust
Ducted Fan: - - -
Specifications:
Span Length Wing Area Weight
B720B 2.49 m (98’’)
2.59 m (102’’)
91.5 dm² (1418 sq.in.) 10.5 kg
(23 lbs.)
Pics:
(Norbert Rauch)