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Author Topic: 12 inch Brig  (Read 4312 times)

andrewh

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12 inch Brig
« on: June 11, 2009, 12:48:13 am »

When Martin calls for footy info, I jump.

This sets out to be the build log of a papie-mache square-rigged Footy racing yacht.
So it's right in the mainstream of model boating, and I can gloss over the "insert Tab A in Slot tau"

When I started the idea was a little silly, but since the square rig has moved on (in footys) enormously in the last month this little beauty is more sensible now than it was then!

Summary.
carved plug in blue foam - takes perhaps an hour
(say if anyone wants a how-to)

No finish whatsoever - just sanded with foam-backed finishing sheets
fixed to wood block so it can be held (upside down in the workmate)

Plug wrapped in kitchen film (cling film/saran wrap) - smoothed reasonably well, but not obsessively

3 layers of papie mache applied - torn-up newspaper soaked in dilute emulsion - in this case goldish colour



notice the elegant teardrop shape!
More as it happens
andrew

As always I can be asked to write more and paid to shut up






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andrewh

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Re: 12 inch Brig
« Reply #1 on: June 11, 2009, 12:49:51 am »

Just to bring us up to date (I will backtrack)




pleases me :D
andrew
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AndyT

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Re: 12 inch Brig
« Reply #2 on: June 11, 2009, 08:32:11 am »

I's only a poor Pie-rat wis now't t' pay ye - so pleez pray tell us yer storie like
Rgds
AndyT
(getting in the mood)
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dreadnought72

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Re: 12 inch Brig
« Reply #3 on: June 11, 2009, 11:00:39 am »

I'm liking this a great deal.  :-))

Andy
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andrewh

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Re: 12 inch Brig
« Reply #4 on: June 11, 2009, 12:16:12 pm »

Right!
A trio of Andrews/Andys - we are quorate and can proceed :}

Looking back I can see I have already fallen into error with selecting the pictures - sorry
Backing up to where I should have been

This is the plug secured in my much-abused Workmate and wrapped with clingfilm

Then three layers of newspaper soaked in emulsion paint - diluted 50/50 with water - the newspaper was torn into strips roughly 12mm wide and 100 long and laid in all directions



The emulsion was gold-flecked stuff for stencilling.  We have a LOT of assorted matchpots so they get pressed into use
Allow to dry for at least a night
as with all papie mache do NOT apply the whole lot in one go.  It has to dry by evaporation, and as the binder/glue dries it becomes waterproof - so the drying can take forever.

another three layers  - this time with orange emulsion (50/50)
andrew
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andrewh

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Re: 12 inch Brig
« Reply #5 on: June 11, 2009, 12:35:39 pm »

Yes, it looks mungy at this stage - this is par for the course.

Allow to dry for a couple of days - then you can sand the outside and get it reasonably smooth and level

As it dries it goes matt and shrinks a little.

BTW - I am told that if well-soaked brown paper is used it shrinks a little and goes rock-hard  - enough to be a stressed skin for white foam aircraft - see Chris Golds who makes 1/4 scale planes with foam and brown paper.

At this stage the hull was fine.  It had a shiny inside finish from the clingfilm, sanded outside and was still a handsome shade of orange.  It then sat for several months while the rest of the world evolved to be ready for the square-rigged footy.

Diversion into square-sail evolution
I had been thinking about low-speed airfoils  - which are often simple shallow arcs with no bottom surface and pondering square rigs for low speeds.
I then discovered Maltese Falcon - the Yacht.  A truly modern square-rigger!
Then I built and tested a single-square-sail footy which has remarkable performance  - and will tack :}

SO BeardFoot was dug out and moved to the fitting-out basin
andrew

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andrewh

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Re: 12 inch Brig
« Reply #6 on: June 11, 2009, 12:47:12 pm »

During the pause I had been slightly disappointed at the "leatheriness" of the hull.  It was not very rigid but perhaps this is how newspaper hulls bonded with emulsion always feel.

While finishing Tmark's balsa footy (Blackwatch) I had a surplus of epoxy finishing resin diluted with alcohol (to penetrate the balsa pores) and rather that waste it (Scottish) I cut up some very light glass cloth (1/2 oz/sq yard) and laminated a couple of layers all over the hull

Now this picture in its right place :}
Getting the glass to lie down was not very easy - so when I had finished I laid a layer of kitchen film (clingfilm) over the wet hull and pressed everything together with my hands until the whole shebang was a smooth a possible.



Left to harden overnight - then post-cured for a day in my post-cure oven

Wunderbar - strong, stiff hull with reasonable finish

I glued in Transom and deck edge supports, and gave the hull a couple of coats of emulsion to seal the interior Papie-mache

andrew
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andrewh

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Re: 12 inch Brig
« Reply #7 on: June 11, 2009, 12:56:24 pm »

The andrew post-cure oven is so hi-tech that you require to be certificated even to read this <*<

Take one cardboard box - for a footy this is an A4 ream-of-paper box
Take one Positive Temperature Coefficient (PTC) mains resistor heater  (this is an old mosquito-killer of the heated plate type)
Put mosquito device in the bottom of the box.
Make a shelf that allows air to circulate and put hull on shelf about the middle of the box
Put Hull or other thing you wish to cure on shelf
put lid on box  - plug in mosquito killer
Regulate temperature by moving the lid as required :}

If you havn't got a mossie-killer try a low wattage mains lightbulb (nightlight or similar) (Make sure it cannot touch anything)
Or go to RS and get one of their tiny anti-condensation heaters and mount it carefully so it cannot contact anything*
*Don't do this route unless you are able to do this safely
andrew
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AndyT

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Re: 12 inch Brig
« Reply #8 on: June 11, 2009, 02:21:37 pm »

Good job i passed my IOSH exam then
Rgds
AndyT
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dreadnought72

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Re: 12 inch Brig
« Reply #9 on: June 11, 2009, 03:40:59 pm »

Then I built and tested a single-square-sail footy which has remarkable performance  - and will tack :}

Oooo!

How well does she point?

Andy (needing info of the pointing ability of single-square-sail rigged model ships for "a future project")
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AndyT

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Re: 12 inch Brig
« Reply #10 on: June 11, 2009, 05:55:42 pm »

So do I
The other Andy(T)
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andyn

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Re: 12 inch Brig
« Reply #11 on: June 11, 2009, 10:47:01 pm »

So while us multi lot are spending ages producing perfect moulds with the most high tech materials, Andy number one is off in his shed making boats from newspaper, cardboard boxes and mosquito killers...

Like it :-))
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dreadnought72

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Re: 12 inch Brig
« Reply #12 on: June 12, 2009, 12:08:46 pm »

...Twelve sequential posts by Andrews.  %%

This, I find, vaguely disturbing.

Andy

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AndyT

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Re: 12 inch Brig
« Reply #13 on: June 12, 2009, 01:22:03 pm »

Duz e recon she'll be a tryin t' make it to treasure island on Sunday?
Rgds
AndyT

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andyn

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Re: 12 inch Brig
« Reply #14 on: June 12, 2009, 01:30:58 pm »

We all know this forum has other meaning underlying the boats, it's the World Andy Forum... ;)
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The long Build

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Re: 12 inch Brig
« Reply #15 on: June 12, 2009, 01:35:41 pm »

We all know this forum has other meaning underlying the boats, it's the World Andy Forum... ;)

Is this a sub Division of the Illluminati   %%
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andrewh

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Re: 12 inch Brig
« Reply #16 on: June 12, 2009, 02:14:18 pm »

Can't be, my light is so dim you can't see at all. 
That's why I shut myself away and crochet footys out of discarded materials
andrew49
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AndyT

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Re: 12 inch Brig
« Reply #17 on: June 12, 2009, 04:41:05 pm »

By jove i've go it AndrewH is going on a Crusade to fight in the Footy Festival
But rather than the Cross of St George on the sail he would put the Cross of St Andrew
Rgds
AndyT
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andrewh

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Re: 12 inch Brig
« Reply #18 on: June 13, 2009, 12:45:11 pm »







andrew
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AndyT

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Re: 12 inch Brig
« Reply #19 on: June 13, 2009, 05:57:30 pm »

Looking Good Andrew
See you tomorrow
Been sailing with John Mereidth today weather has been perfect
Rgds
AndyT
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Brooks

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Re: 12 inch Brig
« Reply #20 on: July 20, 2009, 03:00:14 am »

Looks Great, Andrew!

My topsail schooner thread (bottle boat, thanks AndyT), might give you some ideas for RC squares+f&a in a small boat. Same ideas as my barque, but it works for smaller craft too. The schooner is under-canvased for winds under 5mph, but goes well in 10-20. I needed more keel area than the standard footy, and a bigger rudder too.

Your extra buoyancy forward will be welcome in a run, well designed, my friend.

http://www.rcgroups.com/forums/showthread.php?t=1071509



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meatbomber

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Re: 12 inch Brig
« Reply #21 on: October 01, 2009, 10:01:42 am »

looks great andrew, did you ever continue with it?
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AndyT

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Re: 12 inch Brig
« Reply #22 on: October 01, 2009, 10:25:47 am »

Thats a good point Meatbomber ~ Andrew we are all waiting with baited breath
Rgds
AndyT
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