Search found 898 matches

by barts
Sun Jul 22, 2018 7:14 pm
Forum: Technical - non Engines and Boilers
Topic: Rudder tube construction for glass fibre hull
Replies: 3
Views: 3120

Re: Rudder tube construction for glass fibre hull

My current idea is to fit a fibreglass tube to the hull with epoxy / fillets / cloth, fit top and bottom bushes made from Acetal and support the tube with a few vertical ply webs. There is a shelf already fitted above the waterline at the back of the boat, so if I run through that as well, that the...
by barts
Tue Jul 17, 2018 2:14 am
Forum: Technical - Engines and Boilers
Topic: injector plumbing
Replies: 2
Views: 1273

Re: injector plumbing

Yes, upstream is what I meant. The previous owner had used inline check valves, but my experience with them is poor - if something gets in, once gets to disassemble the plumbing to fix it, whereas with the lift checks, all I need to do is shut off the boiler stop valve, and pull the top of the valve...
by barts
Mon Jul 16, 2018 3:19 am
Forum: Technical - non Engines and Boilers
Topic: Weed hatches in small launches?
Replies: 3
Views: 2542

Re: Weed hatches in small launches?

Well, it really depends on how much you like to go swimming. I've had to dive in to remove a giant ball of Hydrilla from Otter's prop... but Rainbow's prop sticks out far enough, being a double-ender, that I could reach the crab pot line that wound itself around the prop shaft with a boat hook. In a...
by barts
Sun Jul 15, 2018 2:09 pm
Forum: Technical - Engines and Boilers
Topic: injector plumbing
Replies: 2
Views: 1273

injector plumbing

Hi folks - I'm replumbing Rainbow's steam line & boiler feed as they are literally underfoot and make two spots in the cabin suitable only for really small people. The previous owner used two separate boiler checks, one for the injector and one for the engine driven Hypro pump (there's no hand pump,...
by barts
Sun Jul 15, 2018 1:10 am
Forum: Technical - Engines and Boilers
Topic: Steam Actuated Inlet Valves?
Replies: 68
Views: 15995

Re: Steam Actuated Inlet Valves?

skinner.png Caprotti valve gear is more complex. Skinner valve gear is pretty simple to understand the two cams in the center have their motion effectively averaged by the followers, so one cam controls admission and the other cut-off. The max cut-off possible is when both cams are aligned. - Bart
by barts
Fri Jul 13, 2018 4:40 pm
Forum: Technical - Engines and Boilers
Topic: Steam Actuated Inlet Valves?
Replies: 68
Views: 15995

Re: Steam Actuated Inlet Valves?

Catching up on an older thread... As Lopez Mike mentioned, I've been heads down w/ a new job this year. However, I'm on Lopez for a month, working half time (4 day weekends are great!), so I'm catching up, doing some badly needed replumbing on our new to us steamboat (Rainbow) and will be talking w/...
by barts
Thu Jul 12, 2018 12:41 pm
Forum: Technical - Engines and Boilers
Topic: Forgings/Castings for Leak Compound?
Replies: 5
Views: 1960

Re: Forgings/Castings for Leak Compound?

Hi folks -

Is there any way to save the old crank, or is it cracked or bent beyond possible repair? Metal-spraying can save a crank that is simply worn.

- Bart
by barts
Wed Jun 20, 2018 5:22 am
Forum: Technical - Engines and Boilers
Topic: Funnel Diameter to Grate Area ratio
Replies: 7
Views: 2681

Re: Funnel Diameter to Grate Area ratio

One thing to remember is that any 'rule of thumb' should likely distinguish between boilers that force the draft w the engine exhaust, and those that rely on the density difference to provide draft.

- Bart
by barts
Fri Jun 08, 2018 3:30 am
Forum: Technical - non Engines and Boilers
Topic: Fitting stringers and bulkheads to GRP hull
Replies: 7
Views: 2799

Re: Fitting stringers and bulkheads to GRP hull

Check this series out: https://www.youtube.com/watch?v=Drc6zdlLGY0

Note that they do as much as they can in the same day for better adhesion.

- Bart
by barts
Thu Jun 07, 2018 3:42 am
Forum: Welcome
Topic: Question about spare parts
Replies: 24
Views: 9806

Re: Question about spare parts

Note that lubricating oil for engines would be difficult to obtain. An interesting article on the subject is here:

http://www.alexdenouden.nl/08/lubri.htm

Note that lower speed engines and paddle wheels would be easier to construct; propellers are not a simple technology.

- Bart