Search found 1008 matches

by barts
Mon Mar 28, 2022 9:29 pm
Forum: Technical - Engines and Boilers
Topic: A Funny Looking Slide Valve
Replies: 7
Views: 651

Re: A Funny Looking Slide Valve

Equally important is the centerline of the valve rod should be as close as practical to the plane of the cylinder face. This imposes a more a linear force between the two rather than a tendency to rock the valve on it's ends. This is where the designs that have a square or rectangular piece that su...
by barts
Mon Mar 28, 2022 5:07 pm
Forum: Technical - Engines and Boilers
Topic: A Funny Looking Slide Valve
Replies: 7
Views: 651

Re: A Funny Looking Slide Valve

Despite their deficiencies, note that basic slide valves require minimal precision equipment to manufacture, esp. in larger sizes. The interior cavity can be as-cast. The outside can be the same, or filed to the desired dimension. The sliding surfaces could have been scraped into whatever degree of ...
by barts
Fri Mar 25, 2022 2:55 pm
Forum: Technical - Engines and Boilers
Topic: TWIN 32 x 38 mm - steam engine for small boats or canoes
Replies: 60
Views: 10640

Re: TWIN 32 x 38 mm - steam engine for small boats or canoes

On additive fabrication: Those who are not familiar with Kozo Hiraoka's excellent series in Live Steam back in the 70s and 80s would do well to examine one of his books or magazine artiles. Although somewhat smaller in scale than stuff many of us are used to, his fabrication techniques which rely ex...
by barts
Mon Mar 21, 2022 6:54 pm
Forum: Technical - Engines and Boilers
Topic: Better Piston Rings
Replies: 14
Views: 1310

Re: Better Piston Rings

The old adage: Slide valves wear in Piston valves wear out A piston valve in good fit is far more efficient though. A slide valve with 5 square inches of face at 250 psi has 1250 pounds of force exerting on it, quite a loss in horsepower. I did some looking for coefficients of friction measured on ...
by barts
Mon Mar 21, 2022 3:42 am
Forum: Technical - Engines and Boilers
Topic: Better Piston Rings
Replies: 14
Views: 1310

Re: Better Piston Rings

Well, piston valves do have their downsides: * w/o rings, they are quite sensitive to wear and become leaky easily (Otter's engine is like this). * with rings, machining the ported valve sleeve is a bit tricky as is fitting and pressing it in. * no automatic safety valve like a slide valve; if your ...
by barts
Mon Mar 14, 2022 9:48 pm
Forum: Technical - Engines and Boilers
Topic: Better Piston Rings
Replies: 14
Views: 1310

Re: Better Piston Rings

I see old Cromflex piston rings, but nothing named 'Courflex': https://trademarks.justia.com/715/99/cr ... 99043.html

- Bart
by barts
Sat Mar 12, 2022 5:22 am
Forum: Technical - Engines and Boilers
Topic: source for whistle valves
Replies: 2
Views: 421

Re: source for whistle valves

Followup - The valves arrived today via FedEx (free shipping since order was just over $100). The valves are shown here with my new steam siren... want to try the combo on air tomorrow. Rainbow will have two noisemakers when she goes back in the water next year (need to get my shop build and machine...
by barts
Tue Mar 08, 2022 4:21 am
Forum: Technical - Engines and Boilers
Topic: source for whistle valves
Replies: 2
Views: 421

source for whistle valves

I was looking for a nice whistle valve for Rainbow's new steam siren and found a cleaning supply house that has reasonable prices on new United Brass whistle valves. I used the same brand of valves on Otter when I built a new boiler in 1995, and have been quite pleased. Anyway, here's a link: https:...
by barts
Fri Feb 25, 2022 4:28 pm
Forum: Technical - non Engines and Boilers
Topic: Another Sidewheeler Building
Replies: 13
Views: 2272

Re: Another Sidewheeler Building

Nice! Two sidewheelers - a fleet!

Are you thinking about another walking beam, or a smaller engine geared down to drive the paddles?

Will having paddles on both boats make it difficult to come aboard from one to the other, or are you going to use a different tender for that purpose?

- Bart
by barts
Tue Feb 08, 2022 6:32 pm
Forum: Technical - Engines and Boilers
Topic: Upscaling a Hasbrouck engine
Replies: 26
Views: 3081

Re: Upscaling a Hasbrouck engine

As speedy as Reciproca is, I must admit to losing a race to an oldster in a fine lined kayak. I'm not sure that he knew that I was even racing with him. How humiliating! Some fifty years ago, my dad and I mounted a tiny, lightweight outboard (an 1.5 hp AquaBug iirc - hard to keep running well) on a...