Question

What year was the rocket motor developed ?

Answer 1

Answer:

1926

Explanation:

The use of rocket engines for aircraft propulsion opened a new realm of flight to the aeronautical engineer. Robert H. Goddard, an American, developed, built, and flew the first successful liquid-propellant rocket on March 16, 1926

Answer 2

Answer: 1926.

Explanation: Developed, built, and flown by Robert H. Goddard, I believe. Hope this helps!