View Full Version : Elliptical Rotary Engine

04-16-2005, 12:42 PM
Okay, I thoughtI'd heard of all the little oddball steam engine designs in the world, but I stumbled across this ebay auction (http://cgi.ebay.com/ws/eBayISAPI.dll?MfcISAPICommand=ViewItem&item=7507529328) which near the bottom of the page has an ad for a book with the following description
<font face="Verdana, Arial" size="2">Robert Scott Burns, in his 1854 book "The Steam Engine" describes a rotary engine with an elliptical bore. This engine had a rotor of fixed length that rotated on an offset power shaft and contacted the elliptical bore in all positions. This original engine had a cylinder 24" long with an elliptical bore of 20.12" by 18.62". It was said to have an output of 30 horsepower at 32psi of steam. The model described here is based on the original but is not identical in details.</font> Googling yields either nothing, or links to sites selling copies of the book, but nothing useful as to what the hell the damn thing is and why it never caught on. So, anyone know?

John Stevenson
04-16-2005, 12:51 PM
Check your email.

John S.

04-16-2005, 11:56 PM
G'day John, I'd appreciate a pointer to any details of that engine. I'm looking for a novel 'spare time' (huh?) project.
Rgds, Lin.

04-17-2005, 12:26 AM
Is there a patent number that can be found? Sounds interesting.

04-18-2005, 01:54 AM
Mail received. Many thanks http://bbs.homeshopmachinist.net//smile.gif

04-18-2005, 12:05 PM
Sounds like a steam Wankel engine.

Les Burg
04-18-2005, 09:07 PM
Trucker fan
Is this what you are looking for?

04-18-2005, 10:51 PM
I guess I have to chuckle. The ebay ad does in fact admit that the book is "Metalworking Two", published by our hosts, Village Press. Note that it sold for more than the list price. Ya gotta wonder.