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Blackburn Ripon N203 1ste prototype

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Blackburn Ripon N203 1ste prototype

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This picture doesn't really give too much indication of how big these aircraft were. The only clue is the size of the rear seat's gun ring and its engine size. It had a fuselage length of 37 feet. It's a pity that the usual measuring stick that was placed in front of aircraft for official photographs is not visible.
 
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Focke-Wulf FW300 Focke-Wulf FW206 CIOS Report German Activities in the French Aircraft Industry.

quite far i think. Average pay per work hour 80,- Franks

so
fw206 cost 18400000
fw300 cost 12800000
------------------------+
31200000

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Focke-Achgelis Fa284

We had previously had unconfirmed information that the
Germans were developing a large helicopter for the purpose of
carrying heavy loads for short distances, i.e. transporting tanks
or heavy trucks over rivers, hoisting bridge girders into place
etc. The Fa 284 proves to be this type. The design work had been
going on at the Breguet Design Office at Montaudran Aerodrome near
Toulouse, but all the drawings were destroyed when the plant was
bombed, and the following details were supplied from memory by the
French personnel who were interviewed.

The Focke-Achgelis Firm supplied all general arrangement and
some detail drawings and Breguet were asked to design the fuselage
structure and rotor blades. A sketch of the aircraft is given at
pic. 4. It is typical of the Focke-Achgelis helicopters in that
it is of the side by side twin rotor type, the oppositely rotating
rotors each three-bladed and 18 metres (58.5 ft.) diameter, being
carried at each end of a transverse beam consisting of a centre
portion and inclined outriggers built up of tubular struts.

Each blade is built on a tubular steel spar with wooden ribs
and three ply covering. The spar is 8 cm. outside diameter with
a wall thickness of 6.5 mm and is cylindrical and of constant
gauge from the root to the station at 4*5 metres radius. From
this station to the tip it is swaged down until at the tip the
section is a parallel sided oval of 8 cm major axis, outside depth
3 cm and wall thickness 2.5mm. Over the section where the spar
is cylindrical the blades are rectangular of 77 cm chord, tapering
thereafter until at the tip the chord is 36 cm. The aerofoil
Sections are of the NACA 250 Series of 1# thickness/chord ratio.
The area of each blade is 5.4 sqr. metres so that the solidity is
.064-

The original aircraft was to have been powered by 2 BMT 801
engines rated at 1,600 horse power each, but at a later stage the
power was increased to 2,000 horse power. The engines are situated
towards the centre of the transverse beam and drive the rotors
through gears and shafting. A system of clutches is provided so
theither can drive one or both rotors, and the rotors can be
synchronised.

The outrigger beam constitutes the main structural member
and the fuselage is a simple framework attached to the beam and
carries only the usual tail surfaces and a cockpit for the crew

of two which la located behind the rotors. Except for the
cockpit and the tail surfaces the whole framework is left
uncovered. N° accommodation is provided in the fuselage for
freight or other load, but at the centre of the outriggers on
the forward face is a hook and cable incorporating a release
slip. These were to be used to attach heavy items such as tanks.

The undercarriage consist of a wheel under each engine
mounting and a tail wheel.

The Montaudran staff stated that the aircraft as originally
designed was to weigh 12.5 metric tons, lifting a load of 2 tons,
but that later the operating weight was increased to 16 tons, the
load then being increased to 5 tons, , This change was made at the
time the horse power of the engines was increased.

On the return of the Team to Paris a visit was paid to the
Breguet offices, 24 rue Georges Bizet, in company with Captain
Garry, the French Air Ministry project Officer on rotating wing
aircraft.

Monsieur Louis Breguet was interviewed and substantially
confirmed the information which was obtained at Montaudran.

No drawings were available, but the following weight analysis
was obtained, which indicates that the design weight is still
12 metric tons, but that the maximum operating weight is 16 tons.

Weight Breakdown, Fa 284

Fuselage436 kilograms.
Main undercarriage421
Tail wheel157
Tail unit110
Controls140
Rotor blades720
Rotor hubs1500
Main transverse beam10j6
Engines24^0
Engine mountings and
cowlings153
Gear boxes, clutches
and transmission710
Engine accessories18
Fuel tanks and systems235
Fixed equipment190
Weight, empty8106

Weight, empty 8106 kilograms
removable equipment 70 kilograms
Fuel (for one hour) 640 kilograms
Oil 70 kilograms
Crew, two 200 kilograms
Normal freight load 2914 kilograms
Normal weight 12000 kilograms

Maximum freight load 6914 kilograms
Operating weight 16000 kilograms

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CIOS Report German Activities in the French Aircraft Industry.
 
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