Search found 1603 matches

by fredrosse
Thu Aug 15, 2019 2:29 am
Forum: Technical - Engines and Boilers
Topic: Oil burner consumption
Replies: 29
Views: 956

Re: Oil burner consumption

According to the DEFTSHIP hull software, for the Margaret S., the following results show linear functions for propeller horsepower vs displacement. While the Margaret S. is a sidewheeler, the software only considers screw propeller propulsion, so the computer results are comparable to typical steam ...
by fredrosse
Mon Aug 12, 2019 9:37 pm
Forum: Technical - Engines and Boilers
Topic: Oil burner consumption
Replies: 29
Views: 956

Re: Oil burner consumption

According to my hull software, considering maximum displacement speeds (Knots .LT. 1.3*SQRT(LWL-ft), this is a linear function of the general form HP = M*(Displacement) + B. Therefore the function does not go through zero horsepower at zero theoretical displacement, which makes sense, because even a...
by fredrosse
Tue Aug 06, 2019 3:45 am
Forum: Technical - Engines and Boilers
Topic: Oil burner consumption
Replies: 29
Views: 956

Re: Oil burner consumption

"I don't then think that feed water heaters or economisers are worth the extra complexity" I just put a small exhaust feedwater heater on Margaret S, with atmospheric exhaust, and it allows nearly 12 percent more steam generation, due to sending 194F (90C) water into the boiler rather than 70F (21C)...
by fredrosse
Wed Jul 31, 2019 11:15 pm
Forum: Technical - non Engines and Boilers
Topic: Oil inside the condenser
Replies: 4
Views: 457

Re: Oil inside the condenser

"Explain please the reason to use oil with piston valves. I have a piston valve with no oil. Is disaster impending?" Solid piston valve spools, operating in valve cylinders having port passages symmetrical around their entire circumference, produce no side thrust, and can therefore need virtually no...
by fredrosse
Sun Jul 28, 2019 2:22 pm
Forum: General Steamboat stuff
Topic: Where Fred goes when he dies.
Replies: 4
Views: 233

Re: Where Fred goes when he dies.

Mike, I think you are right about that reasoning. On the east USA coast there were almost all sidewheelers, and on ocean service I have never seen sternwheelers. Cross Atlantic service was initially with sidewheelers, and sternwheelers are less suited to rough waters. That being said, sidewheelers d...
by fredrosse
Fri Jul 19, 2019 12:36 pm
Forum: Technical - Engines and Boilers
Topic: How to design a monotube steam separator?
Replies: 3
Views: 277

Re: How to design a monotube steam separator?

"Do you think your steam is very dry already? (In your "machine gun" monotube) I am asking because I was thinking of placing a cyclone separator inside the top of the flask. It'll definitely not hurt, but if the tangential inlet already works out fine, I wouldn't need to braze one together." The mon...
by fredrosse
Fri Jul 19, 2019 6:07 am
Forum: Technical - Engines and Boilers
Topic: How to design a monotube steam separator?
Replies: 3
Views: 277

Re: How to design a monotube steam separator?

Large plant practice dictates a steam/water inlet, tangential to the vertical main vessel, about half way between top and bottom. Vessel steam upflow velocity 3 feet per second (about 1 Meter per second), with minimum 1.5 main vessel diameters above for steam outlet, plus 1.5 vessel diameters below ...
by fredrosse
Thu Jul 18, 2019 12:16 pm
Forum: Technical - Engines and Boilers
Topic: American Walking Beam Engine
Replies: 25
Views: 9863

Re: American Walking Beam Engine

Not at all "off topic" Almost all typical steam engines used harmonic motion for valve gears, usually with an eccentric producing continuous motion, mathematically a complex combination of Sine waves. Usually with slide valves or piston valves, with ports opened/closed during the valve continuous mo...
by fredrosse
Thu Jul 18, 2019 2:34 am
Forum: Technical - Engines and Boilers
Topic: American Walking Beam Engine
Replies: 25
Views: 9863

Re: American Walking Beam Engine

Mike, the owner of this engine will soon be looking for a suitable hull, probably a convert-able sailboat hull in the 60 - 90 foot range, in the New England area, as building a new hull would be far more expensive. Ramon, the walking beam sidewheel engines of the USA were all very similar, and I bas...
by fredrosse
Wed Jul 17, 2019 1:56 pm
Forum: Technical - non Engines and Boilers
Topic: Oil inside the condenser
Replies: 4
Views: 457

Re: Oil inside the condenser

Oil separation in exhaust steam can be very effective, assuming the design of the separating device is correct. However these devices also separate water (exhaust steam wetness) from the exhaust stream, which is significant in our steam launches. IFF the exhaust steam is superheated, then effective ...