Search found 898 matches

by barts
Sun Jan 06, 2019 8:32 pm
Forum: Technical - Engines and Boilers
Topic: Crank-shaft centre-line
Replies: 7
Views: 1950

Re: Crank-shaft centre-line

Well, first order concern is lining up the prop shaft and other things (pumps) driven by the engine, so that usually takes precedence. Otherwise, there's a side-to-side vibration caused by the crankshaft counterweights (unless you have a counter-rotating balance set up ), so keeping the center-line ...
by barts
Sun Jan 06, 2019 8:11 pm
Forum: Technical - Engines and Boilers
Topic: Condensing Circuit Logic
Replies: 17
Views: 3837

Re: Condensing Circuit Logic

The primary reason to keep the hotwell temperatures high in larger plants is to reduce dissolved oxygen, which is bad for boilers. Subcooling the condensate is inevitable with our small plants running at varying power levels, and given the fact that we're going to shut down soon anyway makes the dis...
by barts
Thu Nov 01, 2018 2:02 am
Forum: Technical - Engines and Boilers
Topic: Cylinder head gasket material ?
Replies: 7
Views: 2361

Re: Cylinder head gasket material ?

Assuming you're using normal hobby steam pressures and temperatures: For reasonably flat surfaces, hi temp RTV works like a charm, esp. if you have a small groove in one of the mating surfaces. You can also use gasket material for automotive purposes - it seems to work fine in my experience. If you ...
by barts
Sat Oct 20, 2018 5:04 am
Forum: Technical - non Engines and Boilers
Topic: Prop shaft diameter ?
Replies: 9
Views: 3540

Re: Prop shaft diameter ?

As you might expect, there is lots of detail about this in boat design books. One handy method is shaft diameter for Aqualoy or Monel should be 1/17.5 3 bladed prop diameter... so if you're using a 14" diameter prop, a 3/4" shaft would be a bit marginal. If you have a Tobin bronze shaft, the divisor...
by barts
Sat Sep 22, 2018 3:19 am
Forum: Technical - non Engines and Boilers
Topic: Building a Steam Library
Replies: 5
Views: 3104

Re: Building a Steam Library

I absolutely agree with the above suggestions. I'd also recommend: General boat mechanisms perspective: David Gerr's Propeller Handbook David Gerr's Boat Mechanical Systems Handbook: How to Design, Install, and Recognize Proper Systems in Boats Skene's Elements of Yacht Design Industrial steam backg...
by barts
Wed Aug 01, 2018 4:21 am
Forum: Technical - Engines and Boilers
Topic: Watertube boiler casing lining
Replies: 12
Views: 3655

Re: Watertube boiler casing lining

Either board or fiber will last fine UNLESS the fire hits the material directly, in which case a sturdy refractory material is needed if it is to last over the long term. Friable materials like lightweight firebrick don't handle transport well, either. If you have a wall of tubes between the fire an...
by barts
Mon Jul 30, 2018 4:21 am
Forum: Technical - Engines and Boilers
Topic: Watertube boiler casing lining
Replies: 12
Views: 3655

Re: Watertube boiler casing lining

This will prob. work just fine. Keep in mind that for trailerable boats, the most difficult environment may well be traveling over rutted roads rather than steaming around. I once tried lightweight firebrick - great insulator, but could not deal with shock loads from our admittedly rough roads. Otte...
by barts
Fri Jul 27, 2018 10:24 pm
Forum: Technical - Engines and Boilers
Topic: Watertube boiler casing lining
Replies: 12
Views: 3655

Re: Watertube boiler casing lining

I used 1" thick FiberFrax blanket. Fiberglas would also work where it doesn't get too hot. Firebox is made from castable refractory on the inside, plus Fiberfrax.

Some pictures pre-castable refractory here: http://www.smaalders.net/bart/boiler.html

- Bart
by barts
Fri Jul 27, 2018 1:43 am
Forum: Technical - Engines and Boilers
Topic: Watertube boiler casing lining
Replies: 12
Views: 3655

Re: Watertube boiler casing lining

I used stainless sheet (thin - 22 gauge or so) for the inner sheet. The firebox itself gets insulated w/ something serious like castable refractory if has fire hitting it directly. I used an inner and outer frame to fasten the inner and outer casings; no real problem w/ heat transfer. Again, if the ...
by barts
Sun Jul 22, 2018 7:22 pm
Forum: Sales and Trade
Topic: Semple V engine needed
Replies: 2
Views: 2711

Re: Semple V engine needed

Anybody have a Semple V marine steam engine for sale ? I would be interested in a non finished, or finished one , even plans; to fit into for my whale boat hull. What happen to Semple ? I've stuck a dead end. Thank Bill Fred Semple died in 1998 apparently, and I've not seen any new engines for a lo...