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Author Topic: Materials best wood for small steam boat  (Read 445 times)

dillinger 04

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Materials best wood for small steam boat
« on: February 07, 2020, 04:30:52 AM »

Hello Everyone


Seeking advice I have set plans for small steam powered boat.
Question best wood to build from, was thinking of baltic birch, ply design is plank on frame.
Deck, and bottom, and bulkheads, to be made from 1/4 sheets, sides made from 1/8 cut into section very bottom side made from laminated 1/6 and 1/8 bent around frame . Designed for balsa. I am not a really big fan of do to its soft property dents easy. Would a small model be to heavy if made entirety from baltic birch ply. Is it best to use a mix of woods to build such as Alder wood and perhaps Maple for it's bending property or Oak . Any help would be appreciated
David


 





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grendel

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Re: Materials best wood for small steam boat
« Reply #1 on: February 07, 2020, 07:39:59 AM »

I use lime wood scavanged from wooden ikea blinds for my planking stock, dirt cheap at boot fairs and strips into 12mm planks nicely, it bends well when steamed and has good grain with no knots.
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Davy1

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Re: Materials best wood for small steam boat
« Reply #2 on: February 07, 2020, 08:44:04 AM »

You would be better posting in another section (not really submarine R & D.)


David
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chas

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Re: Materials best wood for small steam boat
« Reply #3 on: February 07, 2020, 09:23:43 AM »

A lot depends on what type of hull you're making. You need to end up with a hull that can take the weight of your plant and gear. Eg, a tug hull of say 30 inches will displace, a lot more than a fine hull like a destroyer. Then there's the centre of gravity to think about, steam boats often have a higher one than an electric model. If the superstructure is substantial too the model will not be stable and might capsize. Shallow draft hulls are another problem again and need to be worked out carefully. If this were my project, I would begin by weighing the plant and gear, with water in the boiler so you know what you're dealing with. If you come back on here with the hull type and the weight of the installation we can help better. You'll also get better advice on what to build it from. The fact that balsa was originally specified makes me wonder if the original needed to be lightly built to sail properly.
Chas

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tonyH

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Re: Materials best wood for small steam boat
« Reply #4 on: February 07, 2020, 11:01:44 AM »

I assume that the thicknesses you quote are for the balsa in which case using ply or anything else such as lime would muck up the measurements totally. It sounds a bit like a GG type, so plank on frame is a very loose description.As Chas noted, lets see the animal and then we could help properly :-))
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dillinger 04

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Re: Materials best wood for small steam boat
« Reply #5 on: February 12, 2020, 05:05:01 PM »

Hello everyone


Thank you for responding to my post appreciated update the design of hull working from old Glynn Guest
Beadle hull - power plant total approximate weight less than a pound small scale .
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tonyH

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Re: Materials best wood for small steam boat
« Reply #6 on: February 13, 2020, 09:37:21 AM »

Hi David,

Does the steam plant weight include the weight of water and/or fuel?
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RST

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Re: Materials best wood for small steam boat
« Reply #7 on: February 13, 2020, 10:36:49 AM »

Is this what "puffin" in modelboats mag was based on?  Theres a good write-up in the online articles section. I found it via google websearch. That author fitted a small steam plant also.
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dillinger 04

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Re: Materials best wood for small steam boat
« Reply #8 on: February 13, 2020, 04:44:29 PM »

Hello every one


Thank you for respond to my post appreciated, are you referring to the article on Rig Swinson
his version of the Clyde - Puffin, in Model boats, that he built utilizing the same plans Beadle hull
Looks like he used plywood to build his . The approximate weight does include the water, and fuel .



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chas

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Re: Materials best wood for small steam boat
« Reply #9 on: February 13, 2020, 11:46:36 PM »

I'm confused at the weight of the steam engine and boiler you quote. What on earth is it? By comparison the smallest Mamod unit weighs 2.5 pounds empty and around 3 pounds filled.
Chas

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dillinger 04

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Re: Materials best wood for small steam boat
« Reply #10 on: February 14, 2020, 04:49:59 AM »


Hello Do you happen to know much water the smallest Mamod, boiler holds in milliliters ?
then I might be able to try to do a comparison, on this, show how small the boilers are to- Mamod
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chas

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Re: Materials best wood for small steam boat
« Reply #11 on: February 14, 2020, 10:10:35 AM »

80 to 100 mls if my ancient brain is remembering correctly.
Chas

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dillinger 04

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Re: Materials best wood for small steam boat
« Reply #12 on: Yesterday at 03:26:18 AM »

Update the boilers hold a max of 1 cubic inch of water, or in ML looks like 16.3871


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chas

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Re: Materials best wood for small steam boat
« Reply #13 on: Yesterday at 09:30:35 AM »

That would be about 2 or 3 thimbles full of water.  What size is the boiler and engine?

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tonyH

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Re: Materials best wood for small steam boat
« Reply #14 on: Yesterday at 01:46:37 PM »

It's as much water as you'd get in the tubes of a pop-pop %% ?
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dillinger 04

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Re: Materials best wood for small steam boat
« Reply #15 on: Yesterday at 05:43:42 PM »

Yah pretty small


This might help explain things a little better while the boilers can handle a bit more water in volume,
the engines are only 1/4 bore x 1/4 stroke so in design 1 cubic inch of water is best to run the engines so they do not become water logged? fuel and water balanced to run out at the same time . Measurement I can get
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tonyH

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Re: Materials best wood for small steam boat
« Reply #16 on: Yesterday at 07:08:08 PM »

Any chance of a photo of the setup?
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