Rocket Motor, Solid Fuel, Ohka

Cylindrical with truncated domed front or top and long exhaust nozzle at rear; nozzle made of welded sections; nozzle attached to main, cylindrical combustion chamber by threads; small, rectangular piece cut out from rim of chamber where it screws on to threaded section on top of nozzle; this rectangle permits peering down into chamber and a view of the threaded connection between the chamber and nozzle.