Search found 718 matches

by Mike Rometer
Tue Jun 18, 2019 2:37 pm
Forum: Welcome
Topic: Hello from Montreal
Replies: 8
Views: 235

Re: Hello from Montreal

Welcome, and I'm sure we are all interested in your archive stuff.

IIRC you need to have a few posts under your belt before the site will accept photos and downloads.
by Mike Rometer
Wed Jun 12, 2019 7:16 am
Forum: General Steamboat stuff
Topic: chelmer river uk how do I get on it?
Replies: 5
Views: 185

Re: chelmer river uk how do I get on it?

There appears to be a slip behind the Paper Mill Lock Tea Rooms at Little Baddow, but whether it is just private you'd need to investigate.
by Mike Rometer
Sat May 11, 2019 1:41 pm
Forum: General Steamboat stuff
Topic: P.S. Waverley
Replies: 1
Views: 186

P.S. Waverley

A visit to the P.S. Waverley web page shows that her boilers are now extinct. They are quite obviously looking for donations. There is plenty of 'gum bumping' about the problem on other sites.


https://www.waverleyexcursions.co.uk/
by Mike Rometer
Wed Apr 17, 2019 7:42 pm
Forum: General Steamboat stuff
Topic: A lovely engine with an interesting bit of history.
Replies: 11
Views: 839

Re: A lovely engine with an interesting bit of history.

Lopez Mike wrote:
Wed Apr 17, 2019 6:44 pm
Which brings up another question. Since cutting down the reciprocating mass is generally a good idea, how about aluminum pistons? It's been a lifetime since I.C. engines used cast iron.
Already made some for my twin. If I can ever find some time to get back to it. :roll: :roll:
by Mike Rometer
Sun Mar 31, 2019 10:21 pm
Forum: Technical - Engines and Boilers
Topic: Opposed-Piston Engine Project - The Steam Version
Replies: 41
Views: 2862

Re: Opposed Piston Engine Project - The Steam Version

"Will the steam not have to expand at twice the usual rate" ANS: Not really, the piston(s) displacement, whatever it is, will still fully occur over 180 degrees of crank rotation, no different from a conventional engine running if at the same RPM as the one illustrated here. The difference is that ...
by Mike Rometer
Sun Mar 31, 2019 10:21 pm
Forum: Technical - Engines and Boilers
Topic: Opposed-Piston Engine Project - The Steam Version
Replies: 41
Views: 2862

Re: Opposed Piston Engine Project - The Steam Version

"Will the steam not have to expand at twice the usual rate" ANS: Not really, the piston(s) displacement, whatever it is, will still fully occur over 180 degrees of crank rotation, no different from a conventional engine running if at the same RPM as the one illustrated here. The difference is that ...
by Mike Rometer
Sat Mar 30, 2019 11:13 pm
Forum: Technical - Engines and Boilers
Topic: Opposed-Piston Engine Project - The Steam Version
Replies: 41
Views: 2862

Re: Opposed Piston Engine Project - The Steam Version

Random thought, having watched the motion on that. Will the steam not have to expand at twice the usual rate? Would that not cause a much more rapid temperature drop and therefore greater condensation in the cylinder? 'Tis only a late night thought, and I could be totally up a gum tree. Off to bed!
by Mike Rometer
Fri Mar 29, 2019 9:43 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 63
Views: 30346

Re: digital steam engine indicator

Basicaly, the ones I've seen are a ring round the crank with 36 notches the one at TDC is larger as calibrator. The notches are read by a small coil with a magnetic core. Don't ask about the attatched electronics, that's beyond my ken, but I believe they can calculate the crank position to better th...
by Mike Rometer
Fri Mar 29, 2019 7:37 pm
Forum: Technical - Engines and Boilers
Topic: digital steam engine indicator
Replies: 63
Views: 30346

Re: digital steam engine indicator

Crankshaft rotation/postion sensing is nothing new or difficult on motor vehicles. The usual method is a magnetic reluctor. If it can be done for 1000s of rpm 100s shouldn't be too hard.