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Junkers Ju 287 V1

     
Název:
Name:
Junkers Ju 287 V1
Originální název:
Original Name:
Junkers Ju 287 V1
Kategorie:
Category:
experimentální letoun
Výrobce:
Producer:
DD.04.1944-DD.MM.1945 Junkers Flugzeug- und Motorenwerke AG, Dessau /
Období výroby:
Production Period:
DD.04.1944-DD.MM.1945
Vyrobeno kusů:
Number of Produced:
1
První vzlet:
Maiden Flight:
16.08.1944
Osádka:
Crew:
2
Základní charakteristika:
Basic Characteristics:
 
Vzlet a přistání:
Take-off and Landing:
CTOL - konvenční vzlet a přistání
Uspořádání křídla:
Arrangement of Wing:
jednoplošník
Uspořádání letounu:
Aircraft Concept:
klasické
Podvozek:
Undercarriage:
pevný
Přistávací zařízení:
Landing Gear:
kola
Technické údaje:
Technical Data:
 
Hmotnost prázdného letounu:
Empty Weight:
12510 kg
Vzletová hmotnost:
Take-off Weight:
20000 kg
Maximální vzletová hmotnost:
Maximum Take-off Weight:
? kg
Rozpětí:
Wingspan:
20,110 m
Délka:
Length:
18,280 m
Výška:
Height:
5,100 m
Plocha křídla:
Wing Area:
58,30 m2
Plošné zatížení:
Wing Loading:
343.053 kg/m2
Pohon:
Propulsion:
 
Kategorie:
Category:
jednoproudový
Počet motorů:
Number of Engines:
4
Typ:
Type:
Junkers Jumo 004 B-2 o tahu 8,73 kN (890,2 kp)
Objem palivových nádrží:
Fuel Tank Capacity:
?
Výkony:
Performance:
 
Maximální rychlost:
Maximum Speed:
559 km/h v 6000 m
Cestovní rychlost:
Cruise Speed:
512 km/h v 6809 m
Rychlost stoupání:
Climb Rate:
7.6 m/s
Čas výstupu na výšku:
Time to Climb to:
33 min do 10000 m
Operační dostup:
Service Ceiling:
10800 m
Dolet:
Range:
? km
Maximální dolet:
Maximum Range:
1500 km
Výzbroj:
Armament:
-
Uživatelské státy:
User States:
Poznámka:
Note:
- první prototyp byl pouze experimentální, pro ověření koncepce, používal trup z He 177 A-3, ocas z Ju 388 L-1, podvozek z Ju 352 A-1 a příďová kola z B-24
- druhý prototyp měl šest motorů, podvěšených po třech pod křídly, měl nový trup odvozený od Ju 288; byl dokončen z 80 %, když padl do sovětských rukou, a byl údajně dokončen v SSSR
- podle některých pramenů byl v SSSR dokončen a testován ne druhý, ale třetí prototyp, s motory BMW 003 po dvou pod křídly a dalšími dvěma na bocích přídě; protože neexistují fotografie, nelze to rozhodnout
- plánovány byly ještě prototypy V4 až V6 s motory Jumo 004 C, Heinkel S 011 nebo BMW 018
Zdroje:
Sources:
Hitchcock, Thomas H. Junkers 288, Monogram Close-Up 2. Monogram Aviation Publications, Acton 1974. ISBN 0-914144-02-2.
Němeček, Václav. Junkers Ju 287, L+K 1982/05.

Junkers Ju 287 V1 -


Junkers Ju 287 V1 -


Junkers Ju 287 V1 -


URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#289858Version : 0
MOD
Junkers Ju 287


The Junkers Ju 287 project originated as part of studies conducted to create a heavy bomber that would outperform not only current but also future fighters of potential adversaries. The use of the arrow wing was a bit of a fashion in Germany anyway, and by this time was being worked out in fairly solid theoretical works.


The idea of the forward arrow became typical for this company. The development of the Ju 287 began in the autumn of 1942 under the direction of Ing. Wocke. Ing. Wocke promised a number of advantages from the forward arrow - improved flight characteristics at low speeds, better airflow on the wings, which in the "classical" arrow was solved by massive aerodynamic fins, improved efficiency of the ailerons … At the same time, he expected that the flow behind the wing so shaped should not so significantly affect the efficiency of the tail surfaces. The aircraft was also to receive jet engines, which promised higher speeds than conventional propulsion.


The design work was accompanied by both careful theoretical calculations and a series of experiments with blowing models and individual parts in an attempt to achieve the best possible results.


The development was very complicated, with different wing shapes and angles, combinations of different numbers of engines and their placement. Models for the wind tunnel played a key role. The models were designated EF (Entwicklungsflugzeug, i.e. experimental aircraft) and about 12 were built -


The EF-55 : an unpowered monoplane, designed for research on the characteristics of the forward wing
arrow
EF-56 : unpowered monoplane with a conventional arrow wing
EF-57 : unpowered monoplane with a forward arrow wing, V-lift
EF-58 : monoplane with forward arrow, oval wings, engines under wings
EF-59 : 2 engines under fuselage, 2 under wings behind trailing edge
EF-66 :forward arrow, 2 engines under wing - followed by EF 122
EF-67 : 2 engines in fuselage
EF-68 : designed specifically for research on different engine locations
EF-116: another model for research on the arrow wing
EF-122 : final form of the development series, best results, expected model for
construction of the actual Ju-287 V1 prototype.
EF-125 : last known model version, similar in concept to the V3 prototype and the EF-140 type


Probably there was also a production model for blowing, i.e. the Ju 287in actual size, intended for aerodynamic tests, carrying 2 Jumo 012 or BMW 018 engines. Wingspan 19, 40 m.


The EF-125 was very similar to the later EF-140. Careful work with the models allowed a relatively rapid progress of prototype construction. The Ju-287-V1 was designed to verify the wing configuration of the EF-122.


At the beginning of 1943, a group around Prof. Hertel started work. It is a well-known story that in order to build the first Ju-287 prototype (RS+RA) as quickly as possible, a number of already finished parts from other machines were used - the fuselage from a Heinkel He177A-3, the tail section from a Junkers Ju-188 G-2, the landing gear even from a downed American B-24 from Convair's licensed production.


RLM ordered a total of 6 prototypes:
Ju-287-V1 = 1st prototype
Ju-287-V2 = identical to V1.
Ju-287-V3 = the most famous. Fuselage from the Ju-288, 2 nacelles under the wings with a trio of BMW 003 A1 engines, one under each wing. Very similar to the EF-131 developed in Russia with six RD-10 engines.
Ju-287-V4 = Identical to the V3.
Ju-287-V5 = Identical to the V3, tested with a machine gun turret on the aft fuselage.
Ju-287-V6 = Matched to V5.


The wing had a negative angle of 19.9° of the spars, the trailing edge angle was -23.5°, and the span was 20.10 m with a 58.30 m2 wing area. This wing carried 2 Jumo 004B-1 engines, but the huge experimental machine needed additional power units. Therefore, 2 more engines were hung on the fuselage sides at the nose. As even this power was not enough for take-off, the prototype was given Walter HWK 501 rocket launchers with 500 kgp thrust, suspended under the underwing nacelles of the jet engines. These rocket motors were discarded after launch.


The prototype was tested at Leipzig-Brandis Airport, as the runways at Dessau were too short. On 16 August 1944, just shortly after the world's first Ar-234 jet bomber, pilot Siegfried Holzbaur made the first flight of the Ju-287 V1. The flight tests were successful and confirmed the concept's practical applicability. The machine behaved very well both in standard flight modes and in slow flight, including landing. After 17 flights were conducted from Brandis, the prototype was moved to Rechlin test base.


However, the designers were dissatisfied with the speed achieved; the top speed of Mach 0.7 did not match the calculated Mach = 0.85. The Rechlin researchers assumed that by using more powerful power units, the machine would reach Mach = 0.92. This required - among other things - the installation of braking parachutes to reduce the landing speed.
During the construction of the second prototype, RLM initially decided to stop the program, but later - in March 1945 - the decision was reconsidered and RLM ordered a stocus series. The manufacturer was to be Allgemeine Transportanlagen GmbH in Leipzig. The serial machines were to be equipped with Jumo 012 engines.


In January 1945, a Ju-287 V1 was photographed at Rechlin by an RAF reconnaissance Mosquito. An air raid followed, during which the Ju-287 V1 was severely damaged. By the end of the war, research work continued with both the repaired V1 and the completed V2, and especially with the V3, which was already a newly built prototype from the ground up, intended as a prototype for series production flight trials. The V4 prototype was to be used for ground static tests.


At the end of the war, many of the machines and their creators fell into the hands of the Red Army and development moved to the USSR. See https://www.valka.cz/topic/view/9421/


Sources:
www.arms.ru
http://xplanes.free.fr/
URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#156123Version : 0

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Junkers Ju 287 V1 detail
Junkers Ju 287 V1 -


URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#170516Version : 0
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Junkers Ju 287 V3


Výrobce / Manufacturer: Junkers Flugzeug und Motorenwerke AG
Kategorie / Category: jednoplošný těžký bombardér
První vzlet / Maiden flight: -
Vyráběn / Produced: 1945
Vyrobeno / Number built: 1
Osádka / Crew: 3
Pohonná jednotka / Power plant: 6x BMW 003 A-1 o tahu 800 kp (7,84 kN)
Objem palivových nádrží: / Fuel capacity (l): -
Hmotnost prázdného letounu / Empty weight (kg): 11 930
Hmotnost vzletová / Take-off weight (kg): 21 555
Maximální vzletová hmotnost / Maximum take-off weight (kg): -
Rozpětí / Wingspan (m): 19,400
Délka / Length (m): 19,770
Výška / Height (m): 5,700
Nosná plocha / Wing area (m2): 58,3
Plošné zatížení / Wing loading (kg/m2): 371,64
Maximální rychlost / Maximum speed (km/h): 856 v h= 6 000 m
819 v h= 0 m
Cestovní rychlost / Cruise speed (km/h): 790 v h= 7 010 m
Rychlost stoupání / Climb rate (m/s): 9,58
Čas výstupu na výšku / Climb to: 7 000 m za 10 min
Dostup operační / Service ceiling (m): 10 620 - 12 000
Dolet / Range (km): 1 585 s pumovou zátěží
Dolet maximální / Maximum range (km): 4 415
Výzbroj / Armament: 1x zdvojený kulomet MG 131 ráže 13 mm dálkově ovládaný v zadním střelišti (nebyla nainstalována, pouze plánována)
Pumy do hmotnosti 4 000 kg
Poznámka / Note: tento prototyp měl být vzorovým pro sériovou výrobu
letoun byl ukořistěn Rudou armádou



Příspěvek upravil dne 19.12.2008.moderátor Vláďa za pomoci těchto pramenů:
Původní Dexterův příspěvek
http://www.aviastar.org/air/germany/ju-287.php
http://prototypes.free.fr/ju287/ju287-1.htm
www.militaryfactory.com
www.century-of-flight.freeola.com
archiv autora

Junkers Ju 287 V1 -


URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#24874Version : 0
A few images from the http://prototypes.free.fr ..
Junkers Ju 287 V1 - Poslední vývojový článek - ruský Tupolev Typ 150.

Poslední vývojový článek - ruský Tupolev Typ 150.
Junkers Ju 287 V1 - Snímky modelů celé série.

Snímky modelů celé série.
Junkers Ju 287 V1 - Ju 287 V1

Ju 287 V1
URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#24920Version : 0
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Diskuse

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Jen tak pro zajímavost. Na Aubiho fotografii jsou dobře vidět malé proužky látky (někdy kousky popruhů či silnějšího papíru) používané pro výzkum aerodynamického proudění na letounech. Obvykle byly snímány filmovou kamerou či fotoaparátem.
URL : https://www.valka.cz/Junkers-Ju-287-V1-t8589#170539Version : 0