A  COMPACT  VALVELESS  PULSEJET  DESIGN
These shots show the completed SharkTM prototype engine, laid out by a tape rule (inches) -
original overall length as shown here was just over 15 inches [.4 m]. It has since been reduced 
by .75 inch [18mm]. In the upper photo, the engine is shown mounted on the test frame, with 
fuel tank [just behind engine tube] connected to the needle valve body.
Photos Copyright 2003 Cottrill Cyclodyne Corporation