|Search||Hot Links||What's New!|
Please let me remind all of you--this
material is copyrighted. Though partially funded by NASA, it is still a private
site. Therefore, before using our materials in any form, electronic or otherwise, you need
to ask permission.
There are two ways to browse the site: (1) use the search button above to find specific materials using keywords; or,
(2) go to specific headings like history, principles or careers at specific levels above and click on the button.
Teachers may go directly to the Teachers' Guide from the For Teachers button above or site browse as in (1) and (2).
| The cylinder is closed on one end
(the cylinder head), and the piston fits snugly in the
cylinder. The piston wall is grooved to accommodate rings
which fit tightly against the cylinder wall and help seal
the cylinder's open end so that gases cannot escape from
the combustion chamber. The combustion chamber is the
area between the top of the piston and the head of the
cylinder when the piston is at its uppermost point of
The up-and-down movement of the piston is converted to rotary motion to turn the propeller by the connecting rod and the crankshaft, just as in most automobiles. Note the crankshaft, connecting rod, and piston arrangement in Figure 6-3 and imagine how the movement of the piston is converted to the rotary motion of the crankshaft. Note particularly how the connecting rod is joined to the crankshaft in an offset manner.
The valves at the top of the cylinder open and close to let in a mixture of fuel and air and to let out, or exhaust, burned gases from the combustion chamber. The opening and closing of a valve are done by a cam geared to the crankshaft. This gearing arrangement ensures that the two valves open and close at the proper times.
Send all comments to email@example.com
© 1995-2013 ALLSTAR Network. All rights reserved worldwide.
|Funded in part by||From
Civil Air Patrol
Updated: March 12, 2004