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Baby V-1 Flies for Fun
May 1946 Popular Science

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Mag Tag: Dyna-Jet Baby V-1

Baby V-1 Flies for Fun

Tiny jet built to power models drives toy car 150 miles an hour

The same kind of a pulse-jet engine that poured winged bombs-V-1s-on England in 1944 has now been reproduced in miniature to power model airplanes, automobiles and boats. The inventors, William L. Tenney and Charles Marks of Minneapolis, have shrunk the Nazi engine to toy size. For its measurements, it probably is the most powerful package of energy ever produced. It will drive a miniature automobile, for example, 150 miles an hour.

The 12-foot Nazi jet produced a "thrust" of 600 pounds. The 21-inch baby jet supplies a thrust of three pounds when not moving, more than that when movement rams air through the spring shutters in its nose. Tenney states that his company, Aeromarine, can go the Nazis one better by producing from 600 to 800 pounds of thrust with an engine less than three feet long and 16 inches in diameter. The V-1 power unit was 22 inches in diameter.

In larger sizes, the inventor believes, this "Dyna-jet" could be used to drive full-scale airplanes, racing cars and boats. He foresees its use as a "life preserver of the air," supplying power for air transports in case of engine failure. It could also, he says, afford extra bursts of speed for fighter planes and for the take-off of heavy planes.

Like the original jet on the robomb, the "Dyna-jet" is economical of parts. And only one of them - the shutters that alternately receive and shut off the entrance of air in the combustion chamber - moves. The entire assembly weighs only a pound. Its fuel is gasoline, kerosene or stove oil.

The "Dyna-jet" tube holds only six ports, made of stainless and spring steels and aluminum.

A bicycle pump supplies the tiny jet, mount on a toy car, with compressed air for starting.

Like the big jet, it uses compressed air, but for a different reason. The robomb contained two cylindrical bottles of compressed air to drive three gyroscopes that governed its flight. The "Dyna-jet" uses compressed air to provide a combustible mixture in the firing chamber to start the engine. Both jet engines use a spark plug for ignition.

The baby jet engine is simple, light, powerful - and can be held safely. A flame a few inches long does issue from the thrust pipe but beyond the flame's tip te heat is dissipated rapidly.

Inventors Tenney and Marks confounded their critics, who predicted the jet engine would burn fingers and ignite model planes and boats, by wrapping it in balsa wood.

The "Dyna-jet" consumes fuel, from a household oil can, at the rate of two to three ounces  minute; operates from 12 to 15 seconds on it.

There is another marked difference be-tween the two engines. The robomb's engine pulsed at a rate of about 45 times a second. The baby jet pulses up to 250 times a second.

It was test flown in Dayton, Ohio, in March, but prior to that had driven miniature racing cars and boats.




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