This appears to be a Tiger II pulsejet, which was a smaller version of the original Tiger pulsejet. The original Tiger was a Japanese clone of the US-made Dynajet.The primary difference was that the Tiger had a welded seam for the full lenght of the combustion chamber and tailpipe whereas the Dynajet was seamless. Both utilized a steel reed valve for the "pulse" operation. The smaller Tiger II had about 2 1/2 lbs of thrust while the large Tiger and Dynajet ran about 4 to 4 1/2 lbs of static thrust. The AMADynajet speed record was about 180 MPH for controline where the model dragged 70 feet of line in a circular path. I believe the current jet speed record is over 200 MPH. I flew controline jet speed as a teenager and hit about 150 MPH which was faster than anything else I flew at the time. Starting involved a large bore tire pump, spark coil and vibrator to light off the unleaded (Amoco) gasoline fuel. You had about 30 seconds from the initial start to getting airborne before the tailpipe started to deform and melt. Those were the days!

Art ARRO