Inspired by Chuck's opposed 4, I decided that I would have a play with rotary porting to see what I could learn about timing. Half way through some experimenting, this idea of a test bed motor came from nowhere!
[ame]http://www.youtube.com/watch?v=lOQOHEJTG00[/ame]
Building the bits.
Assembly
http://i757.photobucket.com/albums/xx213/dvbydt/Air%20Motor/Components1.jpg[/img]
Compressed air is supplied to the copper tube. I don't have steam but I am sure it would work.
The machining took about four hours and I then had a running motor. At 10 psi it runs at 2,000 rpm and at 20 psi it makes 5,500 rpm, I did not want to try it higher!
What did I learn? Rotary ports work easily and there is no need for extreem precision, stationary leakage is no problem. Timing is not that critical. Speed is best governed by restricting the exhaust.
Has anybody got anything to add about the design of rotary ports? Then I can get on with this next project.
Ian
[ame]http://www.youtube.com/watch?v=lOQOHEJTG00[/ame]
Building the bits.
Assembly
http://i757.photobucket.com/albums/xx213/dvbydt/Air%20Motor/Components1.jpg[/img]
Compressed air is supplied to the copper tube. I don't have steam but I am sure it would work.
The machining took about four hours and I then had a running motor. At 10 psi it runs at 2,000 rpm and at 20 psi it makes 5,500 rpm, I did not want to try it higher!
What did I learn? Rotary ports work easily and there is no need for extreem precision, stationary leakage is no problem. Timing is not that critical. Speed is best governed by restricting the exhaust.
Has anybody got anything to add about the design of rotary ports? Then I can get on with this next project.
Ian