The Yokosuka MXY8 Akigusa (秋草, "Autumn grass") was a training glider built in parallel with the Mitsubishi J8M rocket-powered interceptor aircraft.

The J8M was to have simply been a licence-built Messerschmitt Me 163 Komet, but, due to difficulties in obtaining technical materials from Germany, it eventually had to be designed almost from scratch.

[3] The MXY8 was built entirely of wood and fitted with ballast tanks that would be filled with water to simulate the weight and, therefore, flight characteristics of a fully equipped J8M.

A more advanced trainer, the MXY9, equipped with a primitive jet engine was planned but was never produced.

Data from Japanese Aircraft of the Pacific War[5]General characteristics Performance