McDonnell Douglas
MD-80/MD-90
Developed as an improved and
enlarged variant of the DC-9 the MD-80’s first designation was DC-9 Super 80.
Not only the fuselage had been stretched but also wings and horizontal stabilizer
were enlarged. More powerful engines required bigger nacelles. When production
stopped in 1999 a total of 1191 had been built.
For the MD-90 more fuel-efficient
and bigger engines were used and the fuselage had been stretched again. 116
MD-90s have been built between 1993 and 2000.
The fuselage in front of the wing is
very long so it’s easy to get the correct centre of gravity despite the weight
of the rear-mounted engines. Compared to the DC-9 the wing loading is lower for
the MD-80. Because of the vertical stabilizer’s small size directional control
is a problem in case of an engine failure. A gyro on rudder is therefore
recommended.
Powerplant:
Glow:
2 x 7.5 cc (.45 cu.in.) engines
Turbine: 2 x 30
N (7 lbs.) thrust
Ducted Fan: diameter up to 85 mm (3.3’’) (MD-80)
diameter up to 105 mm (4.1’’) (MD-90)
Specifications:
Fiberglass
parts :
Norbert Rauch
Span Length Wing Area Weight
Foam cores: Stefan Hinze
MD-81
(82/83/88) 2.06 m
(81’’) 2.82 m (111’’)
46.6 dm˛ (719 sq.in.) 8 kg
(18 lbs.)
MD-87
2.06 m
(81’’) 2.49 m
(98’’) 46.4 dm˛ (719
sq.in.) 7 kg (15 lbs.)
Retracts: ---
MD-90
2.06
m (81’’) 2.91 m
(115’’) 46.4 dm˛ (719
sq.in.) 8 kg (18 lbs.)
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