Bartel BM-6

infobox Aircraft
name =Bartel BM-6
type =Trainer aircraft
manufacturer =Samolot


caption =
designer =
first flight = 8 April 1930
introduced =
retired =
status = Prototype
primary user = Polish Air Force
more users =
produced =
number built = 1
unit cost =
variants with their own articles =

The Bartel BM-6 was a Polish biplane trainer fighter aircraft of 1930. It did not advance beyond the prototype stage.

Design and development

The aircraft was designed by Ryszard Bartel in the Samolot factory in Poznań, as a trainer-fighter plane. The BM-6 prototype, designated BM-6a, was flown on 8 April 1930 in Poznań. Its advantage was an easy construction and maintenance, according to Bartel's design philosophy. A distinguishing feature of all Bartels was an upper wing of a shorter span, because lower and upper wing halves were interchangeable (i.e. the lower wingspan included the fuselage width). It first introduced a mixed construction to Bartel's designs.

After trials, the prototype was modified in July 1930. The prototype was later redesignated BM.6a/II afther it was substantially modified. It offered quite good flight characteristics and was capable of aerobatic flight. It was demonstrated in a fighter-plane competition in Bucharest in 1930, along with the similar PZL P.1.

The second prototype BM-6b, with a Wright Whirlwind 220 hp radial engine, was ordered, but work upon it ceased with closure of the Samolot factory in mid-1930. The PWS works, which inherited many of Samolot's projects, did not continue the project, for it had its own similar design, the PWS-11.

Operational history

After state trials in 1931, the prototype was used in an advanced training school in Grudziądz, then in an aviation training center in Dęblin.

Operators

;POL
*Polish Air Force (single prototype)

pecifications (BM-6a)

Description

Mixed construction biplane. Steel framed fuselage, rectangular in cross-section, canvas covered (engine and upper sections - aluminum covered). Rectangular two-spar wings with rounded ends, plywood and canvas covered. Upper wing span: 7.36 m, lower wing span: 8.10 m. Lower and upper wing halves were interchangeable. Single pilot, sitting in open cockpit, with a windshield. The V8 engine Hispano-Suiza 8Be was modified to lower power output (from 220 hp to 180 hp). Radiator below the fuselage. Fixed landing gear, with a rear skid. Two-blade wooden propeller of fixed pitch. Fuel tank in fuselage: 168 l capacity.

aircraft specifications
plane or copter?= plane
jet or prop?= prop

ref=
crew= 1
capacity=
length main= 6.30 m
length alt=
span main= 8.10 m
span alt=
height main= 2.76 m
height alt=
area main= 17.6 m²
area alt=
airfoil=
empty weight main= 697 kg
empty weight alt=
loaded weight main= 985 kg
loaded weight alt=
useful load main= 288 kg
useful load alt=
max takeoff weight main=
max takeoff weight alt=
more general=
engine (prop)=Hispano-Suiza 8Be (modified)
type of prop= V8 engine, water-cooled
number of props=1
power main= 180 hp
power alt=
power original=

max speed main= 192 km/h
max speed alt=
cruise speed main= 165 km/h
cruise speed alt=
never exceed speed main=
never exceed speed alt=
stall speed main= 85 km/h
stall speed alt=
range main= 550 km
range alt=
ceiling main= 3,800 m
ceiling alt=
climb rate main= 4 m/s
climb rate alt=
loading main= 56 kg/m²
loading alt=
power/mass main=
power/mass alt=
more performance=
armament=
*One 7.7 mm Vickers machine gun in a fuselage, with a synchronizing gear
avionics=

References

*Andrzej Glass: "Polskie konstrukcje lotnicze 1893-1939" ("Polish aviation constructions 1893-1939"), WKiŁ, Warsaw 1977 (Polish language, no ISBN)

External links

* [http://www.airwar.ru/enc/other1/bm6.html Photos and drawings] at [http://www.airwar.ru Ugolok Neba site] (in Rusian)

ee also

aircontent
related=

similar aircraft=
*PWS-11
*Polikarpov I-15
*Bristol Bulldog
*Gloster Gladiator
*Fiat CR.32

sequence=
BM-1 -
BM-2 -
BM-4 -
BM-5 - BM-6

lists=
see also=