×
Military Pay Military Ranks Aircraft Tanks and Vehicles Small Arms Navy Ships
HOME
AVIATION
MODERN AIR FORCES
COUNTRIES
MANUFACTURERS
COMPARE
BY CONFLICT
BY TYPE
BY DECADE
SECRET WEAPONS OF THE IJA/IJN
WORLD WAR 2
X-PLANE

Mitsubishi Ki-73 (Steve)


Long Range Escort Fighter Proposal


Aviation / Aerospace

The Mitsubishi Ki-73 made it to the design stage and no further - Allied intelligence reports assigned it the name of Steve believing it was to enter service soon.



Authored By: Staff Writer | Last Edited: 1/21/2019 | Content ©www.MilitaryFactory.com
During May of 1943, Japanese authorities delivered a new requirement for a single-seat, single-engine long-range escort fighter to protect bomber formations from interception by Allied warplanes beginning to gain the advantage in the skies over the Pacific and Southeast Asia. The Mitsubishi Ki-73 by Tomio Kubo was one result of this requirement but the type was not furthered beyond a sole, incomplete prototype before the war's end in 1945. Kubo managed to find success with his earlier twin-engine Ki-46 "Dinah" and eventually moved on to the promising "Ki-83" twin-engine, long-range heavy fighter design of which four prototypes ultimately emerged when the Ki-73 was abandoned for good.

Rather unique for a Japanese-originated wartime fighter design was the use of a contra-rotating propeller arrangement in which two three-bladed systems were in play. These were driven by a single Mitsubishi Ha-203-II 24-cylinder, liquid-cooled "horizontal H" inline piston engine of 2,600 horsepower which was essentially two 12-cylinder engines paired and driving the twin propeller units. The rest of the overall design arrangement was conventional - the engine in the nose, a single-finned tail at rear and the cockpit set over center mass. Wings were straight monoplane appendages with clipped tips and the undercarriage was a "tail-dragger" system made fully retractable.

Issues with the early prototype form arose centering on the complex engine fit and there were growing concerns about the structure and control scheme particularly at the speeds anticipated. Eventually work on the troublesome compound engine was ended which, in turn, ended development of the Ki-73. While the Ki-73 was never formally adopted for service and never entered serial production, captured documents by the Allies - who believed the type was to come online soon - ushered in the codename of "Steve" for the series which never was.

The proposed maximum speed for the Ki-73 was 750 kilometers per hour, about 466 miles per hour, making it one fast mount aided through its powerful engine setup and contra-rotating blades. The slender, streamlined fuselage was also clean from nose to tail. Armament would have most likely been all-cannon in keeping with Japanese fighter traditions late in the war, perhaps 4 x 20mm systems buried in the wings (two units per wing).


Specifications



Year:
1944
Status
Cancelled
Crew
1
[ 0 Units ] :
Mitsubishi - Imperial Japan
National flag of Imperial Japan Imperial Japan (cancelled)
- Fighter
- X-Plane / Developmental
(Showcased structural dimension values pertain to the Mitsubishi Ki-73 (Steve) production model)
1 x Mitsubishi Ha-203-II 24-cylinder horizontal H liquid-cooled inline piston engine developing 2,600 horsepower.
(Showcased powerplant information pertains to the Mitsubishi Ki-73 (Steve) production model)
Max Speed:
466 mph (750 kph; 405 kts)
(Showcased performance values pertain to the Mitsubishi Ki-73 (Steve) production model; Compare this aircraft entry against any other in our database)
ESTIMATED:
4 x 20mm cannons in wings (two per wing element)
(Showcased armament details pertain to the Mitsubishi Ki-73 (Steve) production model)
Ki-73 "Steve" - Base Series Designation
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.

Disclaimer | Privacy Policy | Cookies
Military Ranks | Military Pay | Aircraft | Tanks & Vehicles | Small Arms | Navy Ships | American War Deaths | 5-Star Generals | Military Alphabet Code | DoD Terms | Convert Knots to Miles-per-Hour



The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world and WDMMA.org, the World Directory of Modern Military Aircraft.


Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-