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A forum boat build- a simple steam launch
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Synthpunk


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Joined: 19 Feb 2014
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PostPosted: Sun Mar 19, 2017 2:20 pm    Post subject: Reply with quote

Cheers!
I got the boiler tested- as it is an unknown boiler it was tested to 3 times the design pressure, and then a bit more, to 100psi. Held up fine, no weeps or pinholes. So she has been issued an official boiler test safety certificate stating she is good for a w/p of 50 psi which is nice.

I also showed off the supa burner. Jaws dropped, which was also nice. Got lots of good feedback and some ideas for where to evolve it next.
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Les


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PostPosted: Sun Mar 19, 2017 3:03 pm    Post subject: Reply with quote

That's great news.  
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MrDuck


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Joined: 05 Mar 2010
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PostPosted: Sun Mar 19, 2017 6:41 pm    Post subject: Reply with quote

You're on a roll now, better keep going
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Synthpunk


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PostPosted: Mon Mar 20, 2017 6:03 pm    Post subject: Reply with quote

So i cut a pound in weight off the engine mounts, and also drilled and tapped the holes for te mounting bolts.



Im thinking that the area formerly occupied by the boiler mounts would make an excellent area to put two water tanks. Possibly made of wood, and then epoxy glassed for watertightness and lightness.
Edit->

The engine fits perfectly, and aligns bang on. once ive made the tank, ill be etch priming and painting the inside of the hull. Either white or light green, so i can see the inevitably spilled oil.. i had a look at the famous straight runner 'All Alone' yesterday- shes light green on the inside, looks great.
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MrDuck


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PostPosted: Mon Mar 20, 2017 6:58 pm    Post subject: Reply with quote

Your hands grow larger and fatter the faster you need to move them so leave room for handling
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Synthpunk


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PostPosted: Mon Mar 20, 2017 7:10 pm    Post subject: Reply with quote

Hehehe, yeah, funny how that happens!
The engine mounts are assembled using z-rail, which is an adjustable system based on complicated aluminium extrusions, commonly used in making electronics back in the 70s and 80s. Ive got piles of it in my workshop. so the pump position is still adjustable fore and aft at the moment. Im going to footle about with it till i find the best position. I actually have Enormous Hands anyways, so theres a fair bit of room in the boat for that reason.
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Synthpunk


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PostPosted: Mon Mar 20, 2017 7:43 pm    Post subject: Reply with quote

I recon ill go for the built in tank- if i make two little barriers either side of the prop tube, and have a front barrier made of perspex, and the 'lid' will be made of copper clad fiberglass board, so i can solder the filler inlet and breather pipes onto it before gluing the lid on. Ill probably run the filler up to starboard deck level, possibly through a large brass eyelet let into the deck. I might run the breather out the other side, through the hull above water level.

There will be two tanks, separated by the prop tube, so there will be a pipe running between them, probably under the propshaft. The water outlet will be on one side, extending from the front barrier on the starboard side, back through the tank, with the inlet at the back. Ill connect it to the pump using flexible rubber hose.

Its going to have a drain somewhere as well. Dont want to leave water going rancid in it after playtime..

I reckon ill be able to build the whole thing to weigh much less than the separate aluminium tank, and the positioning of it will be exactly where it will be needed most- right at the lowest possible point inside the hull.

Edit- ive worked out the volume that will be enclosed, its about 200 cubic cms, so about a half pint, which is about what the boiler holds. Maybe slightly less, but enough for a 15minute steaming session pondside.
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MrDuck


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PostPosted: Mon Mar 20, 2017 8:08 pm    Post subject: Reply with quote

It just never lasts long enough
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Synthpunk


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PostPosted: Mon Mar 20, 2017 8:18 pm    Post subject: Reply with quote

if this was an r/c build then id agree, but as it is- shes a straight runner- its a team sport. Theres two team members, the competitor and his catcher, who stands at the opposite end of the course and returns the boat to the competitor after each run. she needs to do three straight runs over a measured distance and back, probably lasting no longer than 5minutes tops. The competitor and their catcher each give the pump a few squirts before releasing the boat, so the boiler shouldnt run dry.

The main problem with steam straight runners is timing raising your steam sufficiently with it being your time to compete. Or getting it raised too early and running out of fuel by go time.
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Dont forget to read the small print.
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Synthpunk


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PostPosted: Mon Mar 20, 2017 8:25 pm    Post subject: Reply with quote

i did have an idea of building a 'straight running tender'- a semi scale model of a barge that you anchor near the start line, and basically use as a floating workbench, holding tools, water, meths bottle, maybe a heatproof housing for starting burners in. Locally in east london we have lots of canals, and they have vessels called 'thames lighters' on them, used for general work and cartage around the system. Like a little version of one of them.

If i put an electric motor in it it would be amusing to compete with it as well.
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Dont forget to read the small print.
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MrDuck


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PostPosted: Mon Mar 20, 2017 8:39 pm    Post subject: Reply with quote

I never competed so can't tell but it sounds like fun
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Synthpunk


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Location: The Smoke.

PostPosted: Tue Mar 28, 2017 9:03 pm    Post subject: Reply with quote

Not really a real update type update-
Ive been busy working, and trying to sort out my housing situation. Im still messing about with burners when i get a chance, and still generally messing about. I feel nearer a solution to the various burner issues ive been having, but its difficult to concentrate on combustion when im also concentrating on houses, hammond organs and a forthcoming tour in the summer. Itll get there eventually. Seeing as my boiler now has a safety cert for a wp of 50 psi, i may have a muck about with gas again for a standby solution in case i dont get the alcohol burners working reliably enough. The main problem ill have with that is that i didnt build the hull with commercial gas cartridges in mind, so id have to get a bix tank, which seems... expensive. I might try making one. The hull hasnt changed much since the last photo, i still havent made the water tank. Ill be back with a proper progress report in about a week.
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Dont forget to read the small print.
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this is the small print. Dont forget to look at the bigger picture.

My steam engines--> http://modelmarinesteam.blogspot.co.uk
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MrDuck


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Posts: 39880

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PostPosted: Wed Mar 29, 2017 5:23 am    Post subject: Reply with quote

There is plenty of time before summer though it usually comes by surprise
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Synthpunk


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Location: The Smoke.

PostPosted: Wed Mar 29, 2017 7:59 pm    Post subject: Reply with quote

Heres the latest burner type-

ive been developing it with the help of Xlchainsaw.. i have dubbed it the ultra burner. It is basically an externally pressurized supaburner. The wand is only connected to a very small sump tank. The main fuel tank is at the end of a connecting veedle valve. Its pressurized by a bike pump, and is probably equally suitable for a flash steam plant, or silver soldering. the flame is about 6 inches long, burns outside in the cold and wind, and ROARS.
Now to make it smaller.



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Dont forget to read the small print.
-------------->
this is the small print. Dont forget to look at the bigger picture.

My steam engines--> http://modelmarinesteam.blogspot.co.uk
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Synthpunk


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Joined: 19 Feb 2014
Posts: 1512

FLAGS
Location: The Smoke.

PostPosted: Wed Mar 29, 2017 8:54 pm    Post subject: Reply with quote

Video of first test, outside in the cold and wind->

http://youtu.be/Ll7D68bDF9g
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Dont forget to read the small print.
-------------->
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My steam engines--> http://modelmarinesteam.blogspot.co.uk
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