The Ishikawajima Tsu-11 was a motorjet produced in small numbers in Japan in the closing stages of World War II.

The Tsu-11 used a four-cylinder inverted inline Hitachi Hatsukaze Toku Model 13 piston engine — a license-built version of the German Hirth HM 504 inverted, inline-four cylinder air-cooled engine, with the "model 13" version indicating its adaptation to drive a single-stage compressor.

The Type 11 was powered by solid-fuel rocket motors, which provided tremendous acceleration, but had a very short burn time.

It was reasoned that a jet engine would provide high speed as well as enough range to keep the carrier plane safe long enough to release the Ohka and leave the area.

[1] The Tsu-11 was also selected to power the Yokosuka MXY9 Shuka ("Autumn Fire") - a trainer intended to prepare pilots for the Mitsubishi J8M rocket-powered interceptor.