Blohm & Voss Bv 141

[No.1]

[mfg495]

Excellent find 

[Letipapa]

Blohm & Voss BV 141
From Wikipedia
 
Type: Reconnaissance monoplane
Manufacturer: Blohm & Voss
Maiden flight: 25 February 1938
Primary user: Luftwaffe
Number built: 38
 
The Blohm & Voss BV 141 was a World War II German tactical reconnaissance aircraft prototype. It is best remembered as the most asymmetrical aircraft to have ever flown.


Design and development

In 1937, the Reichsluftfahrtministerium issued a specification for a single-engined reconnaissance aircraft with optimum visual characteristics. The preferred contractors were to be Arado, but the request prompted the Focke-Wulf company to work up the alternative idea of the Focke-Wulf Fw 189, a twin-boom design with two smaller engines and a central crew gondola, while Blohm & Voss proposed something far more radical. The proposal of chief designer Dr. Richard Vogt was the unique asymmetric BV 141.

The perspex glazed crew gondola on the starboard side strongly resembled that found on the Fw 189, and housed the pilot, observer and rear-gunner, while the fuselage on the port side led smoothly from the 1000 hp Bramo 123 engine to a tail unit (which was symmetrical in the BV 141 V1 prototype).

It would seem that the displacement of lift vs weight, and thrust vs drag, would have induced tendencies to yaw and roll requiring continual trimming to control, but the aircraft proved very stable and maneuverable. Indeed Dr. Vogt had calculated that the greater weight on one side of the aircraft could be cancelled out by the torque of the propeller.


Testing

The aircraft's design prompted a mixed response from the Reichsluftfahrtministerium, and had no impact on their decision to build the Fw 189. Indeed, an urgent need for BMW 801 engines for use in the Fw 190 fighter further reduced any chance that the BV 141 would see production.

Three further prototypes and an evaluation batch of five BV 141As were produced, but the assessment was that they were underpowered. By the time that a batch of 12 BV 141Bs were built with the more powerful BMW 801 engines they were too late to make an impression, as production of the Fw 189 was already well along. The BV 141B had the starboard tail-plane virtually removed to improve the rear-gunner's field of view.

Several wrecked BV 141s were found by advancing Allied forces. One was even recovered by British forces and returned to England for examination. None survive today. Contrary to much that has been written, all BV 141s ordered were produced and delivered. Following is the complete record of BV 141 production.


Prototypes

BV 141 V1 ; WNr 141-00-0171 ; D-OTTO
BV 141 V2 ; WNr 141-00-0172 ; D-ORJE then PC+BA
BV 141 V3 ; WNr 141-00-0359 ; D-OLGA then BL+AA


Preseries BV 141 A-0

BV 141 A-01 (V4) ; WNr 01010360 ; D-OLLE
BV 141 A-02 (V5) ; WNr 01010361 ; BL+AB
BV 141 A-03 (V6) ; WNr 01010362 ; BL+AC
BV 141 A-04 (V7) ; WNr 01010363 ; BL+AD
BV 141 A-05 (V8) ; WNr 01010364 ; BL+AE


Preseries BV 141 B-0

BV 141 B-01 (V9) ; WNr 0210001 ; NC+QZ
BV 141 B-02 (V10) ; WNr 0210002 ; NC+RA
BV 141 B-03 (V11) ; WNr 0210003 ; NC+RB
BV 141 B-04 (V12) ; WNr 0210004 ; NC+RC
BV 141 B-05 (V13) ; WNr 0210005 ; NC+RD
BV 141 B-06 (V14) ; WNr 0210006 ; NC+RE
BV 141 B-07 (V15) ; WNr 0210007 ; NC+RF
BV 141 B-08 (V16) ; WNr 0210008 ; NC+RG
BV 141 B-09 (V17) ; WNr 0210009 ; NC+RH
BV 141 B-010 (V18); WNr 0210010 ; NC+RI


Series BV 141 B-1

WNr 0210011 ; GK+GA
WNr 0210012 ; GK+GB
WNr 0210013 ; GK+GC
WNr 0210014 ; GK+GD
WNr 0210015 ; GK+GE
WNr 0210016 ; GK+GF
WNr 0210017 ; GK+GG
WNr 0210018 ; GK+GH
WNr 0210019 ; GL+AG
WNr 0210020 ; GL+AH

The source of this information is the files of the Hamburger-Werke.

The Blohm & Voss team came up with several other asymmetric designs, but none were actually built.


Specifications (BV 141B)
 
The rear gunner in a BV 141B would have had an impressive field of viewGeneral characteristics
Crew: 3, pilot, observer and rear-gunner.
Length: 14 m (45 ft 9 in)
Wingspan: 14 m (45 ft 9 in)
Height: 3.6 m (11 ft 9 in)
Wing area: 53 m? (570 ft?)
Empty weight: 4,700 kg (10,363 lb)
Loaded weight: 5,700 kg (12,568 lb)
Powerplant: 1? BMW 801 , 1,160 kW (1,560 hp)
Performance
Maximum speed: 438 km/h @ 3,500 m (272 mph @ 11,500 ft)
Range: 1,200 km (745 mi)
Service ceiling 10,000 m (32,800 ft)
Rate of climb: 570 m/min (1,860 ft/min)
Wing loading: 60.2 kg/m? (12.3 lb/ft?)
Power/mass: 448 W/kg (0.274 hp/lb)
Armament
2 ? MG 17 machine guns
2 ? MG 15 machine guns


References
Taylor, Michael. The World's Strangest Aircraft. London: Grange Books plc, 1999. ISBN 1-85627-869-7.

External links
Blohm & Voss BV 141

See also
Comparable aircraft
Focke-Wulf Fw 189
Scaled Composites Boomerang (USA)

Also there is lot on: http://aircraftwalkaround.hobbyvista.com/bv141/bv141.htm
http://www.nurflugel.com/Nurflugel/n_o_d/weird_01.htm
http://www.geocities.com/asymmetrics/bv141.htm
http://www.machtres.com/bv141.htm
http://www.vrcurassow.com/2dvrc/sscuracao/BlohmundVoss.html

and a model on:
http://www.aircraftresourcecenter.com/Rev1/401-500/Rev459_BV-141B_Swan/rev459.htm

Here some photo's, the last one is first prototipe.

[mfg495]

Great information 

I have a picture somewhere of an airman fitting a camera magazine into this aircraft, I try and find it 

[No.1]

 

[mfg495]

Some more images of this aircraft.