VACUUM AND HOT AIR ENGINES


| January/February 1961


Route 1 Bucyrus, Ohio

I promised to write about the Atmospheric or Vacuum engine shown on page 13 of the Sept. ALBUM.

I believe you will find that it is not a 'Hot Air' engine, it is more properly known as an Atmospheric engine. It has a much different operating cycle than a hot air engine.

This engine was manufactured in Dayton, Ohio, as a toy and is called a 'Vacuum Rotor' The operating cycle is roughly this, the first function of the cycle is the opening of the admission valve. This occurs just before the piston reaches the head end dead center, then as the piston starts toward the crank center the torch flame is drawn into and fills the cylinder with flame (incandescent gases that is, gases so hot that they glow). Just before the piston reaches the crank end dead center the admission valve closes thereby cutting off the flame.

Now, as we all know, when an unconfined gas is heated it expands or if it is confined its pressure increases and conversely if while confined it is cooled it produces a partial vacuum.

Now back to the engine. We have a cylinder filled with incandescent gases and we have suddenly closed the valve and instantly the flame in the cylinder is extinguished and the heat of the flame is absorbed by the cylinder walls and is then in turn passed to the atmosphere by the fins on the cylinder in air cooled engines or into the water on water cooled engines. The Vacuum Rotor has a small pocket on top of the cylinder for this purpose.






SUBSCRIBE TO FARM COLLECTOR TODAY!

Farm Collector April 16Farm Collector is a monthly magazine focusing on antique tractors and all kinds of antique farm equipment. If it's old and from the farm, we're interested in it!

Save Even More Money with our SQUARE-DEAL Plan!

Pay now with a credit card and take advantage of our SQUARE-DEAL automatic renewal savings plan. You'll get 12 issues of Farm Collector for only $24.95 (USA only).

Or, Bill Me Later and send me one year of Farm Collector for just $29.95.




Facebook Pinterest YouTube


Copyright 2018, All Rights Reserved
Ogden Publications, Inc., 1503 SW 42nd St., Topeka, Kansas 66609-1265