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Russian? DAR-1 flying boat project

silvereagle

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Russian? DAR-1 flying boat project?

I found this flying boat 3v last night on a R/C model website. Identified only as 'DAR-1', I assume it is probably an unbuilt Russian project. Very unusual opposed motors with ducted props and some sort of 'rotating' wingtips, presumably the forward portion is the 'aileron' and it makes use of a slot-effect? Seems it would be rather draggy in cruising flight?



I did an internet search for more information and drew an absolute blank, apart from constantly finding references to an unrelated Bulgarian 'DAR-1' aircraft. I'm sure the complete story is tucked away in some Russian-language book or magazine article, so I'm hoping one of our Russian friends can help as to it's identity, etc?

(And if there's no 'image' can someone please describe how to get the attatchment to attach??)
 

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Silencer1

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Hi!

The story of this flying boat is very intersting - this is Bartini DAR (Long-range arctical explorer).
Some other pictures here http://airwar.ru/enc/cw1/dar.html
However, the aircraft has been built and flown in more conventional configuration, resembling the famous Dornier Wal

Cheers!
 

airman

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Silencer1 said:
Hi!

The story of this flying boat is very intersting - this is Bartine DAR (Long-range arctical explorer).
Some other pictures here http://airwar.ru/enc/cw1/dar.html
However, the aircraft has been built and flown in more conventional configuration, resembling the famous Dornier Wal

Cheers!
and it used awesome engines of Ms 406 ! :D
 

silvereagle

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Hi Silencer.

Many thanks for the article link. I was pretty sure the aircraft as shown in the drawing never flew, mainly because there seems to be almost no centre-section structure and maybe it needs a few more struts?

'Bartine' = Bartini? The version actually built as you say is quite conventional. I look forward to reading the story so I'll see how Google translates the text, I presume the ducted version was planned before the 'final' version was built.

Anyone got an idea as to the source of the drawing?

Can one of the moderators please retitle this as 'Bartini DAR-1 flying boat project'?

Thanks for a fabulous website,
Pete M
 

Silencer1

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Hi!

silvereagle said:
Many thanks for the article link. I was pretty sure the aircraft as shown in the drawing never flew, mainly because there seems to be almost no centre-section structure and maybe it needs a few more struts?

I couldn't find for this moment the photo of mock-up (or prototype in the process of construction) with ducted propellers. I'm sure, that all structural issues of wing center section have been resolved, although, this kind of structure were very unusual for that period, and could produce many doubts about it's properties. This ducted structure has been tested with working props in wind tunnel and shows so-called "negative drag", or additional thrust. There is some other features, incorporated in DAR design, dedicated to improve it's usage in northern conditions - like flaps and flaperons; and kind of skis on hull' bottom (to increase ice- and water take-off and landing characteristics.

silvereagle said:
'Bartine' = Bartini? The version actually built as you say is quite conventional. I look forward to reading the story so I'll see how Google translates the text, I presume the ducted version was planned before the 'final' version was built.

Bartini is correct :cool:
silvereagle said:
Anyone got an idea as to the source of the drawing?

Sourse is Gennadiy Petrov book "Russian hydroplanes and WIGs, 1910-1999"
 

borovik

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Please see also:
http://www.secretprojects.co.uk/forum/index.php/topic,4054.0
 

AeroFranz

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silvereagle said:
Many thanks for the article link. I was pretty sure the aircraft as shown in the drawing never flew, mainly because there seems to be almost no centre-section structure and maybe it needs a few more struts?

It looks like the wing has one spar at about mid chord, and that goes through the center to the other side to pass the loads. That's all the structure you need.
 

Boogey

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ДАР ( дальний арктический разведчик ) means Long Range Arctic Reconnaissance ;
Bartini's flying boat of late 1935 ( not ДАР-1 !!!, as it was Bulgarian school trainer :) ).
Bartini's was simply ДАР.
 

Silencer1

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Hi Boogie!

I think, that is more coorect to translate (only in this case) Разведчик as Explorer, because of it's non-military purpose. In Russian the term "Разведчик" generally used to describe a person, who scouts enemie's position, resources etc. This could be a spy or military scout. Also this word could be used to describe the geologist or some kind of explorer of natural phenomena.
But in aviation, Разведчик is a term, equal to English "Scout" and "Reconnaissance" - in their military role.
DAR' (as far as I knew) main purpose was a survey (or exploration) of Arctic to provide neccessary information for ice-breakers, cargo ships, other aircraft and science expedition. So, this was one of the few (if not sole) Soviet aircraft for non-military survey, in the name of which the Разведчик term has used.
I hope, this lenght clarification would be useful for non-Russian speaking persons on forum.

Boogey said:
ДАР ( дальний арктический разведчик ) means Long Range Arctic Raconnaissance ;

Cheers!
 

Boogey

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Hi Silencer1 :) I guess You're right, although less things were civilian in USRR those days ;D
especially aviation.
The famous Soviet GRU spy Vladimir Bogdanovich Rezun, pseudo Victor Suvorov, after his escape to the West writes in one of his books, that even civilian Lisunov PS-84 ( Li-2, licensed DC-3 ) came out of factories coloured in military green.
Anyway I haven't placed the Bartini's ДАР in my list of the military Soviet aicraft.
 

blackkite

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During the second five-year period, the Northern Sea Route began to be actively explored. Aviation played an important role in this matter. However, aircraft adapted to operate in the specific conditions of the Arctic, almost did not build. Decommissioned military vehicles or conventional transport aircraft were used for air transport and ice reconnaissance.
At the suggestion of the famous polar pilot B.G. Chukhnovsky group of designers, led by R.L. Bartini, were instructed to design a special aircraft suitable for work in the North, in particular, for ice exploration and wiring of caravans of ships.

Such a DAR aircraft (a distant Arctic reconnaissance aircraft) was built at the end of 1935. Its scheme is a flying boat with two engines of 860 hp, capable of landing on water, snow and ice and take off from them. The hull of the boat, the wing frame (its area is 100 sq m) and the plumage - stainless steel. The cladding is a canvas. To free the rear of the wing, under the powerful landing flaps on the aircraft for the first time in the world used double aleron. The aircraft had good flying and operational qualities.

When finding a seaplane on water, snow or ice "gills" with floats that had a "track" equal to 7.0 m, provided it with cross-resistance, and in flight created additional lifting force. The long-term and transverse shape of the bottom of the two-operated boat DAR was chosen from the conditions of ensuring not only good seaworthiness, but also the possibility of taking off and landing on ice or snow, exiting the water on a flat ice or snowy surface if necessary. In this regard, the DAR aircraft used a boat close in shape to the boat of the Dorner Val aircraft, which at the end of the front redana had a flat transverse platform, smoothly moving towards the nose to the usual weak keeled shape. To improve the sliding cushioning properties of the flat ice redening of the DAR aircraft, which was 1 m wide, special 320 mm-wide hollows were installed at its edges, with internal depreciation. They were made of stainless steel with corrugated side walls allowing vertical movement, and rubber cameras inside the runners, which depreciated the landing impact and made the plane land on a hard surface quite soft.

In addition, measures were taken to reduce the landing speed of the DAR aircraft: its wing had a relatively small load on the area (72 kg/sq.m) at normal flight weight, on the rear edge of the wing of the aircraft by 77% of the half-swing installed very effective landing shields of the type of Tsap, and at the ends of the wing there were so-called "floating eleroons" whose rear sections could simultaneously deviate downwards and work as landing shields.

After landing on the water went out on the ice, and then took off from the ice and snow. The DAR speed is 240 km/h, the ceiling is 5500 m, the range is up to 2000 km. The weight of the empty is 4,820 kg, the normal take-off is 7,200 kg, in the overload version up to 9000 kg.

The DAR aircraft underwent factory flight tests in late 1935 and spring 1936. B.G. Chukhnovsky flew with flight mechanic V.I.Chechin and lead engineer I.A.Berlin. During the tests, the ups and downs were performed from the water and landing on the ice. After landing on the water DAR could independently steer ashore and continue the flight, taking off from the ice. In the overload version with full fueling and with a flight weight of 9000 kg, the duration of the FLIGHT DAR reached 20 hours.

However, despite the rather good characteristics and order of five DAR aircraft by polar aviation, they were not mass-produced, mainly because of the complexity of production: the domestic industry at that time did not yet have in the right amount of complex welding equipment, able to ensure the production of even a small series of such aircraft.

Simultaneously with the work on the DAR aircraft, which had a number of unique properties, the design team of I.V. Chetverikova led the development of the long-range Arctic reconnaissance ARC-Z, which was a conventional twin-engine seaplane with smaller geometric dimensions and mass than the DAR R.L. Bartini, but with a much higher speed and maximum flight range of up to 3000 km.

Specifications:
Modification : DAR
Wingspan : 27.40m, Length : 19.00m, Height : 2.85m, Wing area : 100.0m2
Weight, empty aircraft : 4820kg, Normal takeoff : 7200kg, Maximum take-off : 9000kg
Engine type : 2 x Hispano-Suiza 12, Power : 2 x 860hp
Practical range : 2000km, Service ceiling m 5500m, Crew: 2.
 

blackkite

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http://alternathistory.com/dalnij-arkticheskij-razvedchik-dar-sssr/
"While developing the DAR, Bartini proposed installing two 800-strong Ispino-Syza engines on top of each other, so that their propellers would form a coaxe system. At the same time, the entire power plant was placed in a profiled ring channel-central plan. Studies of the "DAR" model in the wind tunnel by the engineer of the SNII VVF M.P. Mogilevsky together with the specialists of the CAGI, showed not only an increase in the thrust of the propellers, but also a decrease in the ratio of frontal resistance of the ring channel. It was the first great scientific achievement of Robert Ludwigovich, which was given the name "Bartini Effect" at the suggestion of the famous aerodynamics specialist I.V. Ostoslavsky. However, to implement the idea because of technical and, mainly, technological reasons failed, limited only to a natural layout."
 

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blackkite

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Hi!
 

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