Boeing 707
For many airlines the 707 was the
first jet airliner in service replacing older propliners. A total of 878
commercial 707s have been built but there was also a large number of aircraft
produced for military use. Originally equipped with JT3B-engines some military
variants have been re-engined with the more advanced CFM56.
For the modelplane fiberglass
nacelles are available either for the JT3B or the wider CFM56 engine. The 707
has a large wing area giving the model a low wing loading. The outboard engines
are far away from the fuselage so the pilot needs a lot of experience in case
of engine failure.
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 105 mm (4.1’’) (some
military variants only)
Specifications:
Span
Length
Wing
Area
Weight
B707-120B
2.49 m (98’’)
2.75 m (108’’) 91.5 dm˛ (1418
sq.in.) 11 kg (24 lbs.)
B707-138B
2.49 m
(98’’) 2.56 m
(101’’) 91.5 dm˛ (1418
sq.in.) 10.5 kg (23 lbs.)
B707-320B
2.78 m
(109’’) 2.91 m (115’’) 110.7
dm˛ (1716 sq.in.) 12.5 kg (28 lbs.)
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(Norbert Rauch)
(Dieter Döring)
(Dieter Döring)