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Dornier Do 28



 
 
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Old December 15th 19, 04:07 PM posted to alt.binaries.pictures.aviation
Miloch
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Default Dornier Do 28

https://en.wikipedia.org/wiki/Dornier_Do_28

The type designation Dornier Do 28 comprises two different twin-engine STOL
utility aircraft, manufactured by Dornier Flugzeugbau GmbH. Most of them served
with the German Air Force and Marineflieger and other air forces around the
world in the communications and utility role. The Do 28 series consists of the
fundamentally different Do 28 A/B (1959) and Do 28 D Skyservant (1966).

Dornier Do 28 A/B

The Do 28 was developed from the single-engine Do 27 at the end of the 1950s.
The design shared the high-wing cantilever layout and the lift augmentation
devices of the Do 27, together with the rear fuselage which seated six
passengers.

The defining feature of the new design was the unusual incorporation of two
Lycoming engines, as well as the two main landing gear shock struts of the
faired main landing gear attached to short pylons on either side of the forward
fuselage. The internal space of the Do 28 was the same as the Do 27.

Like the Do 27, the Dornier Do 28 possessed a high cruising speed, excellent
low-speed handling characteristics, as well as very short takeoff and landing
(STOL) performance. The Do 28 was readily accepted as a natural progression from
its single-engine forebear. With many of the same STOL characteristics, most Do
28 production was destined for military customers, notably Germany, although a
small number were in service for commercial operators as a rugged, low-cost
utility transport. The design proved remarkably adaptable and was developed into
a number of progressively improved variants, from the original D, through the D1
and D2 to the 128-2, introduced in 1980. Each variant introduced a number of
detail changes that enhanced its already versatile performance capabilities.

The Dornier company was given financial assistance from the German government to
develop a larger STOL transport to carry up to 13 passengers. The type was
designated the Do 28D and later named Skyservant. The Do 28D was a complete
redesign and shared only the basic layout and wing construction of the earlier
versions. The fuselage and engine nacelles were rectangular, unlike the rounded
Do 28A/B. The aim was to develop a simple and rugged aircraft for use under
arduous conditions, which could be easily maintained. With a crew of two pilots,
the cabin accommodated up to 12 passengers; freight could be loaded easily
through large double doors and with the seats removed the cabin gave 283 sq ft
(26.3 m2) of unobstructed space. The first flight of a Do 28D took place on 23
February 1966 and the type was publicly exhibited at the Paris Air Show at Le
Bourget airport in June 1967.


Role
STOL light utility aircraft

Manufacturer
Dornier Flugzeugbau GmbH

First flight
29 April 1959 (Do 28 A/B)
23 February 1966 (Do 28D)

Status
In civilian and military use

Primary user
German Air Force

Developed from
Dornier Do 27

Developed into
Dornier Do 228

A total of 121 Dornier Do 28D-2s were built between 1971 and 1974 at
Oberpfaffenhofen for the Bundeswehr (German Federal Armed Forces) where they
replaced aging Percival Pembrokes. They served until the introduction of the
Dornier Do 228 in 1994, predominantly as a transportation and communications
aircraft. 20 aircraft were transferred to the Marineflieger, 10 served from 1978
in the maritime reconnaissance role, additional underwing fuel tanks were fitted
for extended endurance .

The high noise levels and vibration in the cabin led to the type's replacement
by the significantly quieter turboprop-powered Do 228. During the 20 years in
German military service, only three aircraft were lost to accidents.

The Do 28D was flown in 30 countries around the world and is still in service
today. More than 150 aircraft were built. In the German Federal Armed Forces
jargon, the Skyservant was called the "farmer's eagle" and was regarded as a
reliable "workhorse". Turkey received two specially equipped SIGINT aircraft
with the code name of 'Anadolou' as well as the normal transport version.

Specifications (Do 28B-1)

General characteristics
Crew: 1
Capacity: 7 passengers
Length: 9.00 m (29 ft 6 in)
Wingspan: 13.80 m (45 ft 3 in)
Height: 2.80 m (9 ft 2 in)
Wing area: 22.4 m2 (241 sq ft)
Aspect ratio: 8.5:1
Airfoil: NACA 23018 (modified)
Empty weight: 1,730 kg (3,814 lb)
Max takeoff weight: 2,720 kg (5,997 lb)
Fuel capacity: 616 L (163 US gal; 136 imp gal)
Powerplant: 2 × Lycoming IO-540A air-cooled flat-six, 220 kW (290 hp) each
Propellers: 3-bladed Hartzell variable-pitch propellers, 2.03 m (6 ft 8 in)
diameter

Performance
Maximum speed: 290 km/h (180 mph, 160 kn) at sea level
Cruise speed: 242 km/h (150 mph, 131 kn) at sea level (econ cruise)
Stall speed: 70 km/h (43 mph, 38 kn)
Never exceed speed: 334 km/h (208 mph, 180 kn)
Range: 1,235 km (767 mi, 667 nmi) (maximum payload)
Ferry range: 1,680 km (1,040 mi, 910 nmi) (auxiliary fuel tanks)
Service ceiling: 6,300 m (20,700 ft)
Rate of climb: 7.1 m/s (1,400 ft/min)
Takeoff distance to 15 m (50 ft): 290 m (950 ft)
Landing distance from 15 m (50 ft): 230 m (750 ft)

Specifications (Do 28D-2 Skyservant)

General characteristics
Crew: 1 or 2
Capacity: 12 or 13 passengers
Length: 11.41 m (37 ft 5 in)
Wingspan: 15.55 m (51 ft 0 in)
Height: 3.90 m (12 ft 10 in)
Wing area: 29.00 m2 (312.2 sq ft)
Aspect ratio: 8.3:1
Airfoil: NACA 23018 (modified)
Empty weight: 2,304 kg (5,079 lb)
Max takeoff weight: 4,015 kg (8,852 lb)
Fuel capacity: 893 L (236 US gal; 196 imp gal)
Powerplant: 2 × Lycoming IGSO-540-A1E air-cooled flat-six engines, 280 kW (380
hp) each
Propellers: 3-bladed Hartzell constant-speed propellers

Performance
Maximum speed: 325 km/h (202 mph, 175 kn) at 3,000 m (10,000 ft)
Cruise speed: 241 km/h (150 mph, 130 kn) at 10,000 ft (3,000 m) (econ cruise,
50% power)
Stall speed: 104 km/h (65 mph, 56 kn) (power off, flaps down)
Minimum control speed: 65 km/h (40 mph, 35 kn) (power on, flaps down)
Range: 2,950 km (1,830 mi, 1,590 nmi) (with max fuel)
Service ceiling: 7,680 m (25,200 ft)
Rate of climb: 5.3 m/s (1,050 ft/min)




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