Search found 4 matches
- Wed May 11, 2011 2:28 pm
- Forum: Technical - Engines and Boilers
- Topic: Building a long throw model steam engine
- Replies: 8
- Views: 11497
Re: Building a long throw model steam engine
You understand correctly. I have a Jensen model 55 engine (2 cylinder, double acting, 1/2 inch bore x 5/8 inch stroke, with Stephenson reverse valve gear) which can be throttled down to under 100 RPM without any noticable oscillations in speed. It is self starting in forward or reverse. You can loo...
- Wed May 11, 2011 3:10 am
- Forum: Technical - Engines and Boilers
- Topic: Building a long throw model steam engine
- Replies: 8
- Views: 11497
Re: Building a long throw model steam engine
Fred: I hope I've got your name correct... I like your analysis. Especially if I can keep the 5/8" bore. It sounds like accurate valving will be the key to a smooth running low rpm engine. If I understand you correctly, the steam chest valving has to admit steam throughout the entire power stro...
- Mon May 09, 2011 6:48 pm
- Forum: Technical - Engines and Boilers
- Topic: Building a long throw model steam engine
- Replies: 8
- Views: 11497
Re: Building a long throw model steam engine
Hello Hookpilot, My guess is that your engine won't run smoothly at such a low RPM because ot the small scale, because of the high stroke to bore ratio and because of the high steam condensation rate - that phenomenon occurs especially in small models. When steam condensates at a high rate, its ava...
- Mon May 09, 2011 4:44 am
- Forum: Technical - Engines and Boilers
- Topic: Building a long throw model steam engine
- Replies: 8
- Views: 11497
Building a long throw model steam engine
I'm building a 62-inch steam powered model of the snagboat W.T. Preston. I need some advise on building the steam engine for this model. I'd like to build it with a 5/8" bore and 2.25" stroke and sliding valve setup for the two cylinders. Can an engine be built with such a long stroke and ...