Robert Truax was a rocket engineer and founded Truax Engineering. He also collaborated with Aerojet.

In the late 1930s, Robert C. Truax developed rocket engines. We now have a couple of examples by this designer.

For example, the liquid-fueled engine inspired by the Heylandt engine. It was a regenerative type, in which water was used to cool the neck of the De Laval nozzle, entering from one side and pouring into the flow through an annular orifice at that point. The fuel itself was also used to cool the diverging nozzle.

"The Truax Engine"

Robert Truax worked with the US Navy in Annapolis. At the request of the US Navy, he built one of the first jets to assist seaplanes in taking off from the water, which were more resistant to acceleration than land-based aircraft.

"A Precedent of the Jatos"

Interestingly, this engine was called the "Aircraft Accelerator Device." Later, they would become the JATOS or RATOS (Jet Assisted Take-Off or Rocket Assisted Take-Off).