Stargazer2006 said:
Could it be there were several Do 131 variants? The one that was pictured earlier in this topic appears in a NASA document as the "Do 131A", not just plain Do 131...
I found information about that
There DO 131 A and B version
It use Turbofan Lift engine and High bypass cruise engine, no use of the Pegasus VTOL engine !
Do 131 A Military VTOL Transporter
14x Rolls-Royce RB.162-81 Jet Lift engine (7 in each wing pod)
2x Rolls-Royce RB.168-25-38 Cruise engines.
Cruise Speed: 850 km/h ( 528 mph)
Wingspan: 24,82 m (81.42 ft)
Wing area: 88,0m2 (947 ft2)
Length: 24,6 m (80.71 ft)
Height: 8,0m (26.21 ft)
Max STO weight: 41000kg (90400 lb)
Design VTOL weight: 37630 kg (83000 lb)
Payload: 4900 kg (10800 lb) with range of 925 km. (max 7250 kg)
Do 131 B Military VTOL Transporter
the Lift engine pod are removed, for increased Payload
or are replace by fuel tanks for more range
Payload: 7100 kg (15700 lb) with range of 925 km.
Other version based on Do 31
DO P378
Civilian V/STOL
10x Rolls-Royce Jet Lift engine (5 in each wing pod)
4x Rolls-Royce Lift/Cruise engines (Pegasus ?).
Cruise Speed: ?
Wingspan: 24,82 m (81.42 ft)
Wing area: ?
Length: 32,1 m (105,31ft)
Height: 7,3 m (23.95 ft)
Payload: ?
Do 231 Civilian version
80-100 passenger VTOL / transporter projected for late 1970s
12x Rolls-Royce Jet RB.202-25Lift engine (4 in each wing pod, 2 in nose, 2 in tail)
4x Rolls-Royce RB220 Cruise engines.
Max Speed: 900 km/h at 25,000 ft
Wingspan: 26,0 m (85.3 ft)
Wing area: 120,0 m2
Length: 35,55 m (118,8 ft)
Height: 9,55 m (31.3 ft)
Maxium altitude: 11100 m
Maxium climb: rate 13 m/s
Payload: 10220 kg or 100+4 passengers + 22,3 m3 baggage
Range: 800 km (500 mi)
VTOL range with half payload: 2460 km (1330 nm)
VTOL range with max fuel: 2790 km (1500 nm)
max VTOL 59000 kg (130075 lb)
Do 231 Military version
Height: 10,5 m
maxium altitude 10000 m
maxium climb rate 18,5 m/s
Payload 10000 kg
Max STO weight: 66900 kg
the Military version is equip with loading ramp
Source:
http://www.aiaa.org/tc/vstol/unbuilt/index.htm