Yokosuka MXY-7 Ohka

Yokosuka MXY-7 Ohka. The Yokosuka MXY-7 Ohka was a purpose-built, rocket-powered kamikaze aircraft employed by the Imperial Japanese Navy during the final year of the Pacific War. Designed for a one-way mission, it was essentially a manned glider bomb packed with explosives, intended to be carried aloft by a mother aircraft like the Mitsubishi G4M before being released to dive on Allied ships. Its deployment represented a desperate escalation in Japanese militarism and the Battle of Okinawa, though it achieved limited tactical success against the overwhelming United States Navy.

Development and design

The concept was developed in 1944 by a team led by Ensign Mitsuo Ohta of the First Naval Air Technical Arsenal at Yokosuka Naval Arsenal, with significant contributions from the Aeronautical Research Institute of the University of Tokyo. The design philosophy centered on creating a simple, fast, and difficult-to-intercept weapon to counter the superior United States Pacific Fleet. The airframe was constructed primarily of wood and featured a warhead containing over 1,200 kilograms of trinitroanisol explosive in the nose. Propulsion for the final attack dive was provided by three Type 4 Mark 1 Model 20 solid-fuel rocket motors, which could propel the craft to speeds approaching 650 km/h in a terminal dive.

Operational history

The Ohka was first deployed operationally by the Imperial Japanese Navy Air Service's 721st Naval Air Group, also known as the Jinrai Butai (Thunder Gods Corps). Its combat debut occurred on March 21, 1945, during the Battle of Okinawa, but the mission proved disastrous when American Grumman F6F Hellcat fighters from the Fast Carrier Task Force intercepted and destroyed the slow, vulnerable Mitsubishi G4M bombers carrying the Ohkas before they could launch. Subsequent attacks met with minimal success; confirmed hits sank the destroyer USS Mannert L. Abele and damaged several other vessels like the USS West Virginia and HMS Indefatigable. However, the high loss rate of mother aircraft and pilots for marginal gains led many senior officers, including Vice Admiral Matome Ugaki, to question its effectiveness.

Variants

The basic **Model 11** was the only variant used operationally. Several other models were developed but saw little or no combat. The **Model 22**, designed to be launched from the faster Yokosuka P1Y bomber, featured a smaller warhead and a Tsu-11 thermojet engine. The **Model 33** was a proposed larger version with an Ishikawajima Ne-20 turbojet, intended for launch from the Nakajima G8N. Training variants were also essential, including the **Model 43 K-1 Kai** glider trainer and the rocket-powered **Model 43** intended for launches from submarines or cave bases, none of which reached operational service.

Specifications (MXY-7 Model 11)

* **Crew:** 1 * **Length:** 6.06 m * **Wingspan:** 5.12 m * **Height:** 1.16 m * **Empty weight:** 440 kg * **Gross weight:** 2,140 kg * **Powerplant:** 3 × Type 4 Mark 1 Model 20 solid-fuel rocket motors, 2.6 kN thrust each * **Maximum speed:** 648 km/h in dive * **Range:** 36 km after release * **Armament:** 1,200 kg trinitroanisol warhead

Survivors and displays

Several Ohkas survive in museums worldwide, preserved as stark symbols of the Pacific War's final phase. Notable examples are displayed at the National Air and Space Museum's Steven F. Udvar-Hazy Center in Virginia, the Imperial War Museum Duxford in the United Kingdom, and the Yasukuni Shrine Yūshūkan museum in Tokyo. Others can be found at the Planes of Fame Air Museum in California and the Australian War Memorial in Canberra.

Category:Military aircraft of Japan Category:Kamikaze aircraft Category:World War II Japanese attack aircraft