Search found 199 matches

by RGSP
Mon Apr 15, 2019 7:59 pm
Forum: General Steamboat stuff
Topic: Stern tube alterations
Replies: 1
Views: 52

Re: Stern tube alterations

Colin, the bad news is that the thread could be any of several things. The good news is that cutting a new thread should be easy enough, whatever it is. You need to make an accurate measurement of the thread outer diameter, and the pitch, and that should be enough to identify a new thread which will...
by RGSP
Tue Mar 19, 2019 9:32 am
Forum: Technical - non Engines and Boilers
Topic: Boiler feed pump ?
Replies: 16
Views: 653

Re: Boiler feed pump ?

It may well be worth putting a wanted advert in "The Funnel". Feed pumps do sit in people's workshops for a whole variety of reasons, but mainly being too good to scrap, and not really worth enough to justify the effort of advertising. Now I think of it, I bet Mark Rudall (as editor of The Funnel) w...
by RGSP
Mon Mar 18, 2019 8:42 am
Forum: Technical - non Engines and Boilers
Topic: Boiler feed pump ?
Replies: 16
Views: 653

Re: Boiler feed pump ?

You could (of course) use an electric pump, but in my opinion something driven by the main engine is better. The boiler should only generally lose water when the engine is running (whistles excepted), so a pump that runs when the engine runs has a certain logic to it. Stand-alone steam pumps do have...
by RGSP
Sat Mar 09, 2019 12:48 pm
Forum: Technical - non Engines and Boilers
Topic: Wheel sizes ?
Replies: 19
Views: 1443

Re: Wheel sizes ?

Backlash in steering gear is far from the end of the world, but it IS irritating, and a spring tensioner is very simple and largely removes it.
by RGSP
Tue Feb 26, 2019 5:53 pm
Forum: Welcome
Topic: Hello from Massachusetts!
Replies: 30
Views: 1129

Re: Hello from Massachusetts!

RGSP - 16ft is the sweet spot I was considering as well. I am considering a Pearl single and that should power a launch of that size nicely. Any specific Hull designsplans you recommend considering? http://www.selway-fisher.com/ Have a look at Paul Fisher's steam launch designs: I can vouch for mos...
by RGSP
Mon Feb 25, 2019 11:51 am
Forum: Welcome
Topic: Hello from Massachusetts!
Replies: 30
Views: 1129

Re: Hello from Massachusetts!

If you want to trailer your boat around in the future, I would suggest you think more about handling it on slipways than towing it on public roads. I'm close to the East coast of the UK, and many of the suitable bits of water for steamboats are tidal, with not very many slipways, and those that do e...
by RGSP
Mon Feb 11, 2019 6:03 pm
Forum: Technical - Engines and Boilers
Topic: Favourite cylinder lubrication
Replies: 14
Views: 918

Re: Favourite cylinder lubrication

No argument with what Mike says, but if you run at 150 psi or more, or have superheat, just a little oil avoids horrid squeaks: I'm not sure the occasional squeak does the engine a great deal of harm, but it makes me feel awful! What you want is a straight, non compounded steam oil, because it doesn...
by RGSP
Sat Feb 02, 2019 11:49 am
Forum: Technical - Engines and Boilers
Topic: Let's ban Loctite!
Replies: 8
Views: 500

Re: Let's ban Loctite!

This crank was entirely pressed together. I did it all with a cheap hydraulic press. 10 tons (~9k kG) maximum pressure. The rod and main pins were machined with an interference fit of one part per thousand and I never had a failure of the pressed joints. Any tighter fit than that with steel simply ...
by RGSP
Fri Feb 01, 2019 10:00 am
Forum: Technical - Engines and Boilers
Topic: Let's ban Loctite!
Replies: 8
Views: 500

Re: Let's ban Loctite!

I'm inclined to agree with you (and the esteemed Mr Maltby) about not using loctite in complex built-up launch crankshafts. As you say, there are several failures reported in addition to your own. However.... There are crankshafts around, held together with loctite, which have been in faultless serv...
by RGSP
Thu Jan 24, 2019 12:42 pm
Forum: Technical - Engines and Boilers
Topic: Con-rods and length
Replies: 28
Views: 997

Re: Con-rods and length

This one goes on for ever, and I doubt there will ever be full agreement. It's really about fabricated (and splitable) crankshafts), once that is accepted, having a one-piece con-rod is only sensible, and needle roller bearings (or similar) become easy. One side of the argument says that forged or f...