Search found 37 matches

by PatJ
Sun Mar 13, 2022 4:59 am
Forum: Technical - Engines and Boilers
Topic: Valve Gear Simulation
Replies: 14
Views: 1650

Re: Valve Gear Simulation

I have followed Don Ashton (and others), but mainly Don because he seems to deep dive into valvegear subjects to a greater extent than many/most. So read his 8th paragraph here: http://www.donashton.co.uk/html/other_gears.html Does this jibe with what you describe as the benefits of the Bremme gear?...
by PatJ
Sun Mar 13, 2022 3:50 am
Forum: Technical - Engines and Boilers
Topic: Valve Gear Simulation
Replies: 14
Views: 1650

Re: Valve Gear Simulation

I made this graph in Excel for a Stanley 20hp, but unfortunately I am not far enough along in valvegear understanding to program in the Stephenson's link. I can't verify that the labels are correct, but they are my understanding of the various points. I am getting there, but am definitely not there ...
by PatJ
Sat Mar 12, 2022 11:35 pm
Forum: Technical - Engines and Boilers
Topic: Valve Gear Simulation
Replies: 14
Views: 1650

Re: Valve Gear Simulation

Bill Hall has both Stephenson's and Walschert's valve gear programs.

And Alan Wallace has a Stephenson's program (or maybe just a Walschert's program).

.
by PatJ
Sat Mar 12, 2022 11:32 pm
Forum: Technical - Engines and Boilers
Topic: Valve Gear Simulation
Replies: 14
Views: 1650

Re: Valve Gear Simulation

Don Aston has done a lot of work with the Stephenson link, and has a spreadsheet.

I am not sure how to attach stuff here, or what format is accepted, but I have these items.

.
by PatJ
Sat Mar 12, 2022 11:26 pm
Forum: Technical - Engines and Boilers
Topic: Valve Gear Simulation
Replies: 14
Views: 1650

Re: Valve Gear Simulation

I got pretty involved in studying valve gear design a few years ago. I ran across Docksteder's programs, and was impressed with what he had done. I emailed him, and convinced him that he should really share the source code for those programs while he was still able to do so. He did send me some sour...
by PatJ
Sun Dec 26, 2021 4:46 pm
Forum: Technical - Engines and Boilers
Topic: Steam Tug Alva B - Engine Question
Replies: 6
Views: 1119

Re: Steam Tug Alva B - Engine Question

Thanks for the responses. I have been searching the net for rocking valve info, and while plenty can be found regarding the Corliss engines, I have been unable to find anything of significance with a rocking valve engine that is not in a Corliss configuration. One of the only engines I can recall se...
by PatJ
Sat Dec 25, 2021 9:43 pm
Forum: Technical - Engines and Boilers
Topic: Steam Tug Alva B - Engine Question
Replies: 6
Views: 1119

Re: Steam Tug Alva B - Engine Question

Specs on the engine:


22" bore x 24" stroke, 425 hp @ 120 rpm, HPNC (High Pressure Non-Condensing) engine built by Whitman Co., Buffalo, NY


.
by PatJ
Sat Dec 25, 2021 9:42 pm
Forum: Technical - Engines and Boilers
Topic: Steam Tug Alva B - Engine Question
Replies: 6
Views: 1119

Steam Tug Alva B - Engine Question

Can someone explain the rocking valves on the Alva B single cylinder tug engine.

Appears to be two valves, and multiple eccentrics.
by PatJ
Wed Dec 08, 2021 9:37 am
Forum: Technical - Engines and Boilers
Topic: Green Twin Complete
Replies: 13
Views: 2341

Re: Green Twin Complete

I got a notice today that the last part of the multi-part green twin magazine article series was on its way in the mail. So time to open up the original green twin thread, which I had kept concealed so as to not preempt the magazine article. I still don't have the drawings up yet, but will post thos...
by PatJ
Wed Dec 01, 2021 7:36 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 132
Views: 95887

Re: digital steam engine indicator

This is a very old thread, and I have not read all of it. I had a white paper about someone who did make a digital indicator, and he had it hooked up to a personal computer. I will try to find that article. I always thought that a stepper motor would be ideal for actuating a D-valve (or other type s...