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Kayaba Katsuodori

Imperial Japan (1945)

Detailing the development and operational history of the Kayaba Katsuodori Ramjet-and-Rocket Powered Interceptor Proposal.

 Entry last updated on 9/21/2015; Authored by Staff Writer; Content ©www.MilitaryFactory.com



  Kayaba Katsuodori  
Picture of Kayaba Katsuodori Ramjet-and-Rocket Powered Interceptor Proposal


Since 1937, Japanese engineers were working on the ramjet concept that was to power the proposed Kayaba Katsuodori ramjet-and-rocket-powered interceptor of World War 2.

Aircraft propulsion by way of the "ramjet" had been on the minds of aeronautical engineers for some time leading up to World War 2 (1939-1945). Its history lay in the years surrounding World War 1 (1914-1918) but the concept was too advanced for the materials of the time. The arrangement essentially called for the engine to use its forward motion to compress incoming air and produce the needed forward thrust (in this way it would not depend on an axial compressor arrangement to pressurize gasses). One of the inherent restrictions of the powerplant was its inability to produce thrust at zero airspeed - thus negating its value during the take-off phase and requiring use of a supporting thrust package, such as that offered by rocket motors.

Prior to World War 2, scientist around the world were delving into the prospect of ramjet-powered flight and its mysteries did not evade the interest of Japanese engineers. During 1937, teams were formed to explore the concept further with the intent of producing a viable, low-cost aircraft for military service. This work spanned into the war years and the need for such an aircraft only grew once American bombers began appearing over Japanese cities with some regularity.

The Kayaba Katsuodori was the result of this endeavor, a single-seat, ramjet-powered interceptor-minded platform which utilized a short, tailless fuselage configuration with swept-back wing mainplanes. The cockpit would be held well-forward and offered exceptional vision for the pilot. The mid-mounted mainplanes were affixed ahead of midships with each tip capped by small vertical stabilizers. The ramjet propulsion system was buried within the tubular fuselage and a rocket-assist scheme (consisting of four externally-held rocket pods) was to be used. The rocket pods were installed under the wing roots and jettisoned once their usefulness had run out. Having achieved the required speeds, the aircraft would then continue on under ramjet power with a flying window of about 30 minutes being estimated. To aspirate the ramjet, the nose section featured an intake. No conventional undercarriage was to be fitted, instead the aircraft would glide back home powerless and land on a belly-mounted skid. The ramjet under consideration for the project became the Kayaba Model 1 which promised 1,655lb thrust output.

Since the aircraft never achieved prototype form, performance specifications were estimated and this included a maximum speed of 560 miles per hour with a rate-of-climb around 11,000 feet-per-minute. The latter would prove a good quality to have in interception sorties. The service ceiling was listed at 49,215 feet. Dimensions were an overall length of 14.7 feet, a wingspan of 29.5 feet and a height of 6 feet. Empty weight was 1,875 lb with a listed loaded weight of 6,615 lb.

As an interceptor attempting to tackle very large, slow-moving (but well-defended) targets, it was seen to arm the jet appropriately through 2 x 30mm Ho-301 series cannons - this was a suitable arrangement to counter even the high-flying and technologically advanced Boeing B-29 "Superfortress" which had made its presence known since mid-1944. The cannons would have been embedded in the sides of the nose.

Design work on the Katsuodori progressed into 1943 and plans were underway to begin construction of a working prototype for the following year. However, Japan's fortunes in the war had worsened into 1944 and the attention of authorities turned to more viable military weapons such as the Rikugun Ki-202 "Sharp Sword", a rocket-powered interceptor based on the German wartime Messerschmitt Me 163 "Komet".

This spelled the end of the line for the little ramjet-powered interceptor.
Any available statistics for the Kayaba Katsuodori Ramjet-and-Rocket Powered Interceptor Proposal are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).
Kayaba Katsuodori Specifications
National Flag Graphic
Imperial Japan
Year: 1945
Type: Ramjet-and-Rocket Powered Interceptor Proposal
Manufacturer(s): Kayaba - Imperial Japan
Production: 0
Supported Mission Types
Air-to-Air
Interception
Unmanned
Ground Attack
Close-Air Support
Training
Anti-Submarine
Anti-Ship
Airborne Early Warning
MEDEVAC
Electronic Warfare
Maritime/Navy
Aerial Tanker
Utility/Transport
Passenger Industry
VIP Travel
Business Travel
Search/Rescue
Recon/Scouting
Special Forces
X-Plane/Development
Structural
Crew: 1
Length: 14.76 ft (4.5 m)
Width: 29.53 ft (9.00 m)
Height: 6.07 ft (1.85 m)
Empty Weight: 1,874 lb (850 kg)
MTOW: 6,614 lb (3,000 kg)


Installed Power
1 x Kayaba Model 1 ramjet engine developing 1,653 lb of thrust; 4 x Rocket boosters for take-off.

Standard Day Performance
Maximum Speed: 559 mph (900 kph; 486 kts)
Maximum Range: 249 mi (400 km; 216 nm)
Service Ceiling: 49,213 ft (15,000 m; 9.32 mi)
Rate-of-Climb: 3,333 ft/min (1,016 m/min)


Armament
PROPOSED:
2 x 30mm Ho-301 cannons in nose


Operators List
Imperial Japan (cancelled)

Series Model Variants
• Katsuodori - Base Series Name; design work only.


Supported Weapon Systems
Graphical image of an aircrat automatic cannon