Search found 230 matches

by RGSP
Fri Jun 19, 2020 3:29 pm
Forum: Technical - Engines and Boilers
Topic: Viability of brazing a tubesheet?
Replies: 13
Views: 418

Re: Viability of brazing a tubesheet?

I haven't done it myself, but model locomotive builders often use brazing for their boilers, and they tell me that getting everything hot enough is really rather difficult, even on boilers for the smaller models. I've done a fair bit of vacuum brazing of industrial pieceparts, and that makes a lovel...
by RGSP
Tue Dec 31, 2019 10:43 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 8912

Re: VFT tube leak

Don't be afraid to experiment. But don't go blowing yourself up! Surely the second half of that line can be reversed when politicians are the experimenters? Willingale Tubes are possibly the main suppliers of finished boiler tubes in the UK, and they go to great lengths with their tube bending syst...
by RGSP
Thu Dec 19, 2019 11:18 am
Forum: Technical - Engines and Boilers
Topic: VFT tube leak
Replies: 54
Views: 8912

Re: VFT tube leak

Wicksteeds (https://wicksteed.com/wicksteed-products/tube-expanders/) make a big range of tube expanders, and while they aren't cheap, you only normally need one for a boiler, and compared with the cost of a new boiler they're not expensive at all. There must be a comparable manufacturer in the US w...
by RGSP
Fri Nov 15, 2019 9:57 am
Forum: Technical - Engines and Boilers
Topic: Cylinder Sleeves
Replies: 5
Views: 1928

Re: Cylinder Sleeves

With aluminium it is SOMETIMES possible to convert its surface into a hard anodised layer, which is wear resistant and can be suitable as a cylinder surface, but not all grades of alloy will allow good strong anodising, and in any case finding someone to do it properly may be more difficult and expe...
by RGSP
Sat Sep 14, 2019 2:16 pm
Forum: Technical - Engines and Boilers
Topic: And Now for the Twin
Replies: 80
Views: 29959

Re: And Now for the Twin

Now you've got all those stresses to either get rid of or live with. I recommend marinading the welded unit in something which will produce a thin organic film on the steel, having dissolved a bit of grease beforehand. Something around a 4% v/v solution of methanol in pure water would do. If need be...
by RGSP
Tue Sep 10, 2019 9:19 am
Forum: General Steamboat stuff
Topic: Steaming Season
Replies: 16
Views: 2786

Re: Steaming Season

I suppose one of us close to the zero degree meridian ought to say that the steaming season here is optional. Quite a lot of people do steam their boats for the summer months only, but some of us carry on all winter, and very pleasant it is too. The rivers and lakes are relatively quiet, and if it g...
by RGSP
Sat Aug 31, 2019 8:56 am
Forum: Technical - Engines and Boilers
Topic: Quad versus twin compound
Replies: 12
Views: 4397

Quad versus twin compound

A couple of days ago I had an hour out in "Falcon", an 1890s steamboat now giving short tours from Stalham in North Norfolk. Falcon was given a new compound twin engine last winter, built by Steamboat Jack of this forum, and I'm pleased to say it's running nicely, and quietly. The previous engine wa...
by RGSP
Wed Aug 21, 2019 9:15 pm
Forum: General Steamboat stuff
Topic: Searching for my Steamboat's History
Replies: 20
Views: 4281

Re: Searching for my Steamboat's History

Lining up engine and prop shaft accurately is obviously a nice thing to do, and congratulations on doing it. However, having suffered seriously from the effect several decades ago, I have to rather reluctantly point out that all hulls distort when put into water, particularly normal open launch hull...
by RGSP
Wed Aug 21, 2019 9:02 pm
Forum: Technical - non Engines and Boilers
Topic: Electrical system for boat
Replies: 35
Views: 12664

Re: Electrical system for boat

...... I have reservations about using phosphoric acid as it supposedly leaves an iron phosphate layer on the steel. I'm doubtful about the thermal properties of such a layer. Don't worry about the thermal properties of the iron phosphate layer: most of these chemically grown layers only get to a m...
by RGSP
Sun Aug 18, 2019 8:41 am
Forum: Technical - non Engines and Boilers
Topic: Electrical system for boat
Replies: 35
Views: 12664

Re: Electrical system for boat

For those of you who have an electrical system, what are you using to charge it and how much battery capacity do you run? An automotive alternator seems like an option, but given the low speed and reversing nature of our engines, is this workable? As a good rule of thumb, electrical generators work...