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 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
Videos:
(1)
Pics:
(Norbert Rauch)