later in world war ii, the "luftwaffe" experimented with the messerschmitt me 328 as a parasite fighter, but problems with its pulsejet engines could not be overcome. other late-war rocket-powered projects such as the arado e.381 and sombold so 344 never left the experimental stage. by contrast, the empire of japan were able to get the yokosuka mxy7 ohka kamikaze rocket plane type into active service, typically using the mitsubishi g4m (betty) bomber class to carry them within range. however, their effectiveness proved minimal in part because allied air naval defense took advantage of the weight of the parasitical aircraft payload slowing the carrying bombers, making them vulnerable to interception before the rocket plane could launch.