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guys,im a new member here..
would like to know whether the displacer piston can works if it is
smaller than the cylinder?i mean much smaller,where the hot air can
leaks from the top to the bottom of the piston...

currently i'm doing my final year project on Gamma Stirling engine

thanx in advance!

Well, welcome, and good luck with your project.
Hopefully, one of the more hands-on folks will give a more specific answer, but ....

You want your displacer to be smaller, such that it moves quite freely. It has the purpose of "displacing" so air is suppose to slip by it from one end to the other. But, if the displacer is too small, it will move up and down, but not move the air enough.

thanx Joe..so that means it can works if the diameter of the displacer smaller than it's cylinder but not too much..isn't it?

i'll post some pictures some other day..
actually,the engine was developed by my lecturer last year but couldn't work out (no power output produced)so,my task is to make it run in order to get A in the project..

hopefully the other members will share some of their knowledge with me..

pictures would be great.
we are all interested in real engine attempts.

don't forget to include the funny ones,where the engine flies apart on early attempts!

also, do not count on getting real power out of the engine. it is too complicated here to explain all that, just trust me. to get your A in the class, maybe find some excuse to use the occilating engine to fly a small flag to signal back and forth, or something.