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 model. So the flight characteristics are not quite the same as the larger and more stable flying 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: diameter up to 70 mm (2.8)
Specifications: Fiberglass parts: Norbert Rauch
Span Length Wing Area Weight Foam cores: ---
B720B 2.49 m (98) 2.59 m (102) 91.5 dm² (1418 sq.in.) 10.5 kg (23 lbs.) Retracts: Hawe Modellbau