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Kawasaki Ki 28 [Bob]

Kawasaki Ki-28 / 川崎 キ28・试作战斗机

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    Název:
    Name:
    Kawasaki Ki-28 Kawasaki Ki-28
    Originální název:
    Original Name:
    キ28试作战斗机
    Kategorie:
    Category:
    stíhací letoun fighter aeroplane
    Výrobce:
    Producer:
    DD.MM.1936-DD.12.1936 Kawasaki Shipyard, Ltd., Kakamigahara /
    Období výroby:
    Production Period:
    DD.MM.1936-DD.12.1936
    Vyrobeno kusů:
    Number of Produced:
    2
    První vzlet:
    Maiden Flight:
    04.11.1936
    Osádka:
    Crew:
    1
    Základní charakteristika:
    Basic Characteristics:
     
    Vzlet a přistání:
    Take-off and Landing:
    CTOL - konvenční vzlet a přistání CTOL - conventional take-off and landing
    Uspořádání křídla:
    Arrangement of Wing:
    jednoplošník monoplane
    Uspořádání letounu:
    Aircraft Concept:
    klasické conventional
    Podvozek:
    Undercarriage:
    pevný fixed
    Přistávací zařízení:
    Landing Gear:
    kola wheels
    Technické údaje:
    Technical Data:
     
    Hmotnost prázdného letounu:
    Empty Weight:
    1420 kg 3131 lb
    Vzletová hmotnost:
    Take-off Weight:
    1760 kg 3880 lb
    Maximální vzletová hmotnost:
    Maximum Take-off Weight:
    ? kg ? lb
    Rozpětí:
    Wingspan:
    12,000 m 39ft 4,43in
    Délka:
    Length:
    7,900 m 25ft 11,01in
    Výška:
    Height:
    2,600 m 8ft 6,36in
    Plocha křídla:
    Wing Area:
    19,00 m2 204.51 ft2
    Plošné zatížení:
    Wing Loading:
    92,60 kg/m2 18.97 lb/ft2
    Pohon:
    Propulsion:
     
    Kategorie:
    Category:
    pístový piston
    Počet motorů:
    Number of Engines:
    1
    Typ:
    Type:
    Kawasaki Ha-9-IIa, kapalinou chlazený vidlicový dvanáctiválec o vzletovém výkonu 625 kW (850 k) při 2 350 ot/min a v h= 3 500 m byl výkon 588 kW při 2 200 ot/min.
    Vrtule dvoulistá kovová s pevným úhlem náběhu vrtulových listů o průměru 2 900 mm
    Kawasaki Ha-9-IIa twelvee-cylinder liquid-cooled vee engine rated at 838 hp for take-off at 2,350 rpm and 789 hp at 11,483 ft at 2,200 rpm,
    driving a two-blade fixed-pitch metal propeller of 9ft 6,2in diameter.
    Objem palivových nádrží:
    Fuel Tank Capacity:
    270 - 360 l 59.5 - 79.2 UK gallons
    Výkony:
    Performance:
     
    Maximální rychlost:
    Maximum Speed:
    486 km/h v 3500 m 301.4 mph in 11483 ft
    Cestovní rychlost:
    Cruise Speed:
    406 km/h v ? m 252.3 mph in ? ft
    Rychlost stoupání:
    Climb Rate:
    16,9 m/s 3326.8 ft/min
    Čas výstupu na výšku:
    Time to Climb to:
    2,9 min do 3000 m 2,9 min to 9843 ft
    Operační dostup:
    Service Ceiling:
    11000 m 36089 ft
    Dolet:
    Range:
    1002 km 622.6 mi
    Maximální dolet:
    Maximum Range:
    ? km ? mi
    Výzbroj:
    Armament:
    2x pevný kulomet Type 89 ráže 7,7 mm
    Two fixed forward-firing 0.303 in Type 89 Model 2 machine-guns
    Uživatelské státy:
    User States:
    - -
    Poznámka:
    Note:
    Spojenecké kódové jméno Bob. The Allied code name was "Bob"
    Zdroje:
    Sources:
    René J. Francillon Ph.D., Japanese Aircraft of the Pacific War, Naval Institute Press, Annapolis Maryland, Reprinted 1990, ISBN-0-87021-313-X
    Robert C. Mikesh and Shorzoe Abe, Japanese Aircraft 1910-1941 US Naval Institute Press, rok 1990, ISBN:10-1-55750-563-2
    Famous Airplanes of the World, No.24, Army Experimental Fighters, BunrinDo Co.Ltd. Japan
    http://www.airwar.ru/enc/fww2/ki28.html
    oldwolf.diy.myrice.com - náčrtek z boku
    www.historyofwar.org
    archiv autora - fotografie
    URL : https://en.valka.cz/topic/view/29901#107394Version : 0
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    Kawasaki Ki-28
    - / - / Bob
    キ28 航空機 / Ki-Nijuhachi Kokuki / -

    History:

    In December 1935, adopted by the Rikugun Koku Hombu (command of the army air force) into his arms last dvouplošnou fighter Ki-10, which later allied intelligence service assigned the name of Perry. Army air forces by that time rejected all jednoplošné fighters, recall the attempt by dr. Richard Voghta with aircraft the Kawasaki Ki-5, or to a competitor dvouplošného Perry - Nakajimu Ki-11, this monoplane was not entirely without hopes of inclusion into the arms, Rikugun Koku Hombu it cleverly managed to use as a "nátlakového" of the aircraft. Simple refusal given to the agile companies 三菱重工業 - Mitsubishi Jūkōgyō Kabushiki Kaisha (hereinafter referred to as Mitsubishi) with the prototype of a fighter aircraft Ki-18, which was "denavalizovaný" the prototype of the navy adopted jednoplošníků A5M. Army air forces by the end of 1935 too lpělo on high dexterity, which biplanes offer.

    The following year, however, in the army air force brought a ground breaking change, perhaps it was due to the fact that the army, the air force did not want to fall behind its traditional rival - air force maritime and maritime air force was preparing to include to their arms jednoplošné fighter A5M1. It is also possible that the responsible military commanders were influenced by america, - Boeing P-26 and certainly had a great influence, too, the French fighter jets Dewoitine D.500. In short, in April of 1936, the army, the air force lists the new competition for a new military fighter aircraft, with the condition that the submitted projects should be no longer only jednoplošné aircraft.

    The competition has also signed up three air factories, Mitsubishi joined the project of the aeroplane Ki-33, which was again "denavalizovaný" Claude, now in the version of the A5M2a. The company 中島飛行機株式会社 - Nakajima Hikōki Kabushiki Kaisha (hereinafter referred to as Nakajima) took the project of the Ki-27, both of these aircraft should be, and also, ultimately, been driven by hvězdicovými, air cool engines Nakajima Ha-1. The company 川崎航空工機業株式会社 - Kawasaki Kōkūki Kōgyō Kabushiki Kaisha (hereinafter Kawasaki) has submitted a project aircraft Ki-28, the project worked engineer Takeo Doi, the one lost on its principle, for the drive of their fighter jets pushed the drive-line engine Ha-9-IIa. Inline engine, this time a French production, powered still the fourth plane, which was in competition occupied only for the purpose of comparing the performances and the flight characteristics of this aircraft was the japanese Dewoitina – Nakajima Ki-12, the work of the French designers of Roger Robert and Jean Beziauda of the aviation factory Dewoitine. The competition sparked a wide controversy what type of engine it is more convenient. Nakajima Ki-12 was for the representative of the Rikugun Koku Hombu too modern looking classical, the "uselessness" as retractable landing gear and cannon armament were not found to be necessary, indeed, rather the contrary. The winner of the competition was declared the prototype of Nakajima Ki-27 and its competitor to the Kawasaki Ki-28 should act on the design team to the factory Nakajima as "duress".

    Let us return to the description and to the history of the creation of the airplane Kawasaki Ki-28, engineer Takeo Doi in his design remained faithful to the design school dr. Richard Voghta, which was understandable, secondly he was previously Voghtovým assistant and in addition to the construction team Kawasaki got to some time constraints, Nakajima had a considerable head start, because the project worked before the promulgation of the competition (Kawasaki report back to the protests on the information leakage). Takeo Doi began working on the project in November 1935 and took advantage of the experience with nepřijatým type of Kawasaki Ki-5. Doi, however, proposed a completely new aircraft, which compared to the Ki-5 has changed the ratio of length of the margin, did not use the "W" of a broken wing (that advocated by dr. Voght), the center wing was now straight and the radiator fluid was retractable, retracting the condenser is carried out manually. Construction was all-metal and chassis remained hard, the Ki-28 was, however, less robust than in the prototype Ki-5. Armament was typically a japanese – only two machine guns of 7.7 mm. The first prototype was completed exactly one year later, in November 1936, the second prototype is in the testing ongoing at the airport Kagamigahara joined about one month later. Army tests then were conducted on the base in Tachikawa, and according to the available sources all its participants did well. The Ki-28 was definitely the fastest and the best growing and at the same time also the most acceleration of the airplane. In dexterity, it both of its competitors slightly the droid threat gone. It was a big loss for the japanese army air force, that at this time yet failed to introduce into his arms next to the highly resourceful of the Ki-27 the category of rapid detention of fighters with heavier armament. This route could be up to two years later, when the government announced the specs on the overflow fighter, Ki-44 and subsequently, in 1940, when once again the factory Kawasaki has commissioned the development of the assault of the fighter Ki-60, it was not a success and the armament was adopted by the more versatile fighter The Ki-61 Hein. Army air force, however, already at that time lacked experience with fast jednomotorovými aircraft, which would be able to fight mainly with the hostile bombing by the air force and the type of the Kawasaki Ki-28 had the assumptions for the addition of armament, with such a "heavy" tank stand..
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    Přiložím still in side view.




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    Photos of the prototype of a fighter aircraft Kawasaki Ki-28.






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