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Author Topic: Goth IOM build  (Read 14067 times)

CJ1

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Goth IOM build
« on: October 02, 2013, 08:41:28 PM »

I've decided to have a go at one of Frank Russell's free IOM plans, the Goth. It's going to be a glassed balsa hull and deck.
I'm using balsa shadows, reduced to allow for the thickness of balsa and glass. Building board is chipboard with stations set up along a centre line as from the plans.
Chris
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CJ1

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Re: Goth IOM build
« Reply #1 on: October 02, 2013, 09:14:28 PM »

I decided to use a 2.5mm spruce keel, stem and bearer pieces either side of it in line with the keel box to help spread the lateral load. The rest of the hull is 2.5mm balsa, cut into 10mm strips with a balsa stripper. I'm using white pva glue to join the wood and tape over the shadows to ease their removal later.
Chris



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CJ1

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Re: Goth IOM build
« Reply #2 on: October 02, 2013, 09:32:51 PM »

Once I'd got the middle three planks in place, tapered to fit the stem, I next placed the plank that sits below the chine to establish a fair line for this chine. This chine starts about 1/3rd from the stem and is quite marked at the stern.
I superglued the planks at their ends if there was any chance of them springing and let this set before I bent the rest of it in place.
Whilst the stem is the final piece, the transom is a sacrificial shadow at this stage. It will be replaced with a nice piece of wood later.
I want to do as little fairing as possible later to keep an even thickness of wood under the glass, so the pegs help keep the planks aligned while the glue sets.
Chris
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CJ1

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Re: Goth IOM build
« Reply #3 on: October 02, 2013, 09:45:08 PM »

Then it was just a matter of working out which plank worked best as the next one to go in. I laid them as a matching pair to prevent the hull twisting and also to try and get them to look equal.....(just in case the hull looks good when finished; I might save some weight later by not painting it).
The side light showed up my hope for getting the planks exactly aligned as a lost cause!


Chris
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CJ1

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Re: Goth IOM build
« Reply #4 on: October 02, 2013, 09:53:05 PM »

The topsides of the Goth are slab sided at the front with a tiny bit of tumblehome at the stern. I replicated this by using two wide planks of 2.5mm balsa either side.
Chris
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CJ1

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Re: Goth IOM build
« Reply #5 on: October 02, 2013, 09:59:51 PM »

I inserted my proper transom piece from a clean plank of 2.5mm balsa.
Then it was time to sand the hull down. 2.5mm is not a lot to play with so this was done with care, a softwood sanding stick and finally a piece of sandpaper in my hand along the line of the grain. There's little hope of getting cross scratches out at this thinness.
Chris
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CJ1

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Re: Goth IOM build
« Reply #6 on: October 02, 2013, 10:12:40 PM »

I'm using West 105 epoxy with 206 slow hardener and 100gm glass twill to cover the hull. With the smooth side of the twill uppermost, there is less to sand.
To keep weight down, I decided after weighing up the pros and cons of both methods, to lay the glass down on the bare wood and stipple the epoxy through it to wet out the balsa. I know a lot of people brush on a layer of epoxy and let that set first before laying down the glass.
A friend gave me the tip of laying masking tape on the glass in the area you will be cutting it (before you cut it), to stop fraying. It worked well.
I was able to use just one piece of twill. This adapted to the shape of the hull well, needing just a few relieving cuts around the hull edges, especially stem and transom chine areas, to allow the shape to conform properly without lifting.
Chris
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CJ1

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Re: Goth IOM build
« Reply #7 on: October 02, 2013, 10:18:46 PM »

Then a second layer of epoxy was applied.
After a couple of days to let this cure, I started the slow process of rubbing down. That's as far as I've got at the moment, but she feels very fair and smooth. I've got to 800 wet and dry so far. I'm leaving her on the shadows while I sand her as it's much easier and less chance of twisting her.
I like the colour of the balsa now, so I'm going to leave her unpainted with just a thin waterline painted on.
I'll post again when I can get her off the stocks and do the inside. That will be a few weeks I'm afraid but I'll keep posting as soon as I've done more.
Chris
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Stavros

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Re: Goth IOM build
« Reply #8 on: October 02, 2013, 10:27:48 PM »

Quality workmanship there keep this blog going I LOVE IT
 
 
Dave
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derekwarner

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Re: Goth IOM build
« Reply #9 on: October 02, 2013, 10:36:13 PM »

Brilliant Chris  :-)) .......may I ask....what type of tape [shown below] are you using over each frame?......[to stop the planking sticking to the frames].............Derek
 
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CJ1

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Re: Goth IOM build
« Reply #10 on: October 02, 2013, 10:44:25 PM »

Derek,
I used thin electrical insulating tape cut in half lengthways. I tried PTFE but it was all over the place! Just wouldn't keep still.
Dave,
Thank you for your kind comments. I'll certainly keep the post up to date.
Chris
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Tug-Kenny

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Re: Goth IOM build
« Reply #11 on: October 03, 2013, 10:41:50 AM »


What a pleasure to follow this build. :-))   Excellent work.

ken


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MikeK

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Re: Goth IOM build
« Reply #12 on: October 04, 2013, 09:17:59 AM »

What a pleasure to follow this build. :-))   Excellent work.

ken

Ditto that  O0 :-)) Makes me itch to get the balsa stripper out again. I built a Triple Crown in the same way, but no way as good as yours.
Looking forward for further episodes

Mike
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marter1229

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Re: Goth IOM build
« Reply #13 on: October 05, 2013, 04:24:20 PM »

 :-)) Enjoying your build.
Will be waiting  for more.
Terry
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Big Ada

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Re: Goth IOM build
« Reply #14 on: October 05, 2013, 04:37:11 PM »

Very nice. :-)) :-)) :-)) .
 
Len.
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Saylee

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Re: Goth IOM build
« Reply #15 on: October 16, 2013, 06:24:45 AM »

I like the colour of the balsa now, so I'm going to leave her unpainted with just a thin waterline painted on.
Love it! The finish is turning out really well. Love the p-o-f look. Keep up the good work!
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CJ1

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Re: Goth IOM build
« Reply #16 on: October 19, 2013, 10:39:33 AM »

Thank you for your kind comments guys. What's a p-o-f look? I'm having a senior moment here!
Chris
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Netleyned

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Re: Goth IOM build
« Reply #17 on: October 19, 2013, 10:54:39 AM »

Plank on Frame  :-)) :-)) :-))


Ned
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CJ1

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Re: Goth IOM build
« Reply #18 on: October 19, 2013, 11:23:30 AM »

You'll make a model maker out of me yet! Thank you....I learn't one more thing today.


Chris
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CJ1

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Re: Goth IOM build
« Reply #19 on: November 10, 2013, 12:11:59 PM »

I took the hull off the shadows this week. After a little cleaning up of the glue runs inside ( I knew there would be lots!), she looked better than I hoped.
I then used a layer of 100gsm glass across the inside of the hull as a strengthener for the shrouds/mast area and a round patch around where the rudder tube will penetrate the hull.
Next was a single layer of 100gsm glass over the whole of the inside on top of this, trying to use as little resin as would wet out the glass.
The final weight of the hull so far is 362gms. I have no idea if this is good, bad or indifferent!
Chris






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Netleyned

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Re: Goth IOM build
« Reply #20 on: November 10, 2013, 03:18:04 PM »

You'll make a model maker out of me yet! Thank you....I learn't one more thing today.


Chris

Looking at that beautiful hull you are definitely a model maker already


Ned
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dlancast

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Re: Goth IOM build
« Reply #21 on: November 10, 2013, 04:02:10 PM »

Beautiful work Chris!  :-))
Dennis
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CJ1

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Re: Goth IOM build
« Reply #22 on: November 10, 2013, 06:02:16 PM »

Thank you guys. I'm really enjoying doing it. I've built plank on frame before but not where weight is important. You really have to concentrate.
Sadly I'm having to do this build sporadically and I can't wait each time to work on it. I'll keep posting whenever I am able to finish a bit more.
Chris
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pompebled

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Re: Goth IOM build
« Reply #23 on: November 14, 2013, 08:18:10 PM »

Hi Chris,

Nice work on the build sofar, it's a joy to watch!

Regarding your idea of not painting the hull; I'd add one layer of UV resistant varnish, to stop the epoxy from getting yellow over time, as epoxy isn't UV resistant.

Regards, Jan.
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Twister

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Re: Goth IOM build
« Reply #24 on: November 20, 2013, 02:23:09 PM »

       'I'd add one layer of UV resistant varnish, to stop the epoxy from getting yellow over time, as epoxy isn't UV resistant.'


This advice is a little too late for this build but for future reference there are some epoxies that do have UV filters in them - they tend to be used in the manufacture of surf boards etc, one example being 'seabase' (I've nothing to do with them & haven't used it - it was just the 1st result from a web search). I wouldn't be surprised if the likes of WEST & SP didn't have a similar product.


Fantastic build log & I'm looking forward to seeing your progress.


Row
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