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Old Dec 23, 2012, 08:02 PM
Registered User
United States, MI, Bloomfield Hills
Joined Feb 2010
535 Posts
Simon,

This article is about building a carbon fiber Marblehead but it shows a method of using shadows, foam blocks and lots of sanding.

http://radiosailingshop.com.au/index...age=page&id=11
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Old Dec 24, 2012, 09:35 AM
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United Kingdom, North Shields
Joined Feb 2012
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Foam for male mould

Thanks Andrew & Ted. It looks like both my ideas would work, so specific questions to Andrew:
1. could you get the finished hull reasonably accurate without using ply shadows? It is very attractive to use only a soft material, so no hard patches and quicker

2. I assume drywall mud is plaster of one form or another. Is that correct?

3. What sort of paint so as not to melt the foam?

4. Packing tape (parcel tape I susect here) sounds good to me, but how does one avoid getting rucks on the joins? I had imagined using shrink wrap over the mould but guess the foam might melt with the hot air gun needed to shrink it. Any thoughts?

Thanks and Happy Christmas to you all
Simon
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Old Dec 24, 2012, 01:38 PM
Useful Idiot
Asturias, Spain
Joined Mar 2001
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Quote:
Originally Posted by SimonRobinson View Post
...
4. Packing tape (parcel tape I susect here) sounds good to me, but how does one avoid getting rucks on the joins? I had imagined using shrink wrap over the mould but guess the foam might melt with the hot air gun needed to shrink it. Any thoughts?

Thanks and Happy Christmas to you all
Simon
Appluing it diagonally seems to avoid the problem.
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Old Dec 24, 2012, 04:29 PM
David Cook Victoria, BC Canada
Joined Oct 2012
231 Posts
Porky Pig flies on maiden voyage

Thanks to Eric A's hard efforts to assemble Porky Pig ,4, hull no. 1 in a record 10 days after receiving the hull, decks and bits and pieces he went racing on its maiden voyage and managed to win a couple of races. See attached photos.

Hull no. 2 has its transom on and I'm building an assembly jig to align all the add-ons. Plans are in the works to build boats no. 3 and 4 early in the new year.

Merry Christmas to all.

David
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Old Dec 24, 2012, 04:37 PM
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Calgary Alberta, Canada
Joined Feb 2008
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Thanks Andrew & Ted. It looks like both my ideas would work, so specific questions to Andrew:
1. could you get the finished hull reasonably accurate without using ply shadows? It is very attractive to use only a soft material, so no hard patches and quicker

Yes, it is amazing how hard glued paper gets, use black marker around edge.

2. I assume drywall mud is plaster of one form or another. Is that correct?

Yes.

3. What sort of paint so as not to melt the foam?

Latex house paint

4. Packing tape (parcel tape I susect here) sounds good to me, but how does one avoid getting rucks on the joins? I had imagined using shrink wrap over the mould but guess the foam might melt with the hot air gun needed to shrink it. Any thoughts?

It does a little but not bad, you need to fill pin holes anyway. Also try finding link to German rubber method, no not the kinky sites, but these guys uses latex rubber sheets to streach over the mould, stapling it tight, then rolling out the air bubbles. Good luck

One other idea I have seen was making a full mould, deck and hull all in one the glass it all the way around the once cured you use acetone to dissolve the foam.
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Old Dec 24, 2012, 11:16 PM
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United States, CA, Fairfax
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Merry Christmas

...
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Old Dec 25, 2012, 05:26 AM
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United Kingdom, London
Joined Jun 2005
821 Posts
Merry Christmas

Merry Christmas to all IOM Skippers and Happy New Year!
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Old Dec 26, 2012, 04:17 PM
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United Kingdom, North Shields
Joined Feb 2012
22 Posts
Foam mould

Thanks for all the useful advice. I'me going to do some practice and experimenting with foam sections. Eventually when I've done the complete boat I will post a link with photos to show how I did it.
I hope Santa brought you all the right IOM bits and pieces.
Simon
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Old Dec 27, 2012, 02:49 PM
David Cook Victoria, BC Canada
Joined Oct 2012
231 Posts
Eric went out sailing yesterday in very puffy conditions. See video links below.

PP4 1 (0 min 38 sec)


PP4 2 (0 min 55 sec)


PP4 3 (0 min 39 sec)


The boat has exceeded our expectations, I've got the first paying customer, going to make a female mold and set up a builder ASAP. If anyone is interested feel free to email me at porkyiom at telus.net for more info. Boat will be available in kit or complete form. Price TBD.

Cheers

David
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Old Dec 27, 2012, 08:12 PM
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United States, FL, Jacksonville
Joined Mar 2012
55 Posts
Cant find for Mast Heel for Mast tube foot . no Heel Fitting w/pin . Maybe use make one delin rod plug for Mast heel ?

Baron
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Old Dec 27, 2012, 10:53 PM
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Canada, BC, Maple Ridge
Joined Jul 2011
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Quote:
Originally Posted by deafsail View Post
Cant find for Mast Heel for Mast tube foot . no Heel Fitting w/pin . Maybe use make one delin rod plug for Mast heel ?

Baron
Is this what you are looking for?

http://www.midwestmodelyachting.com/...elFittings.asp

John
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Old Dec 28, 2012, 07:14 AM
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United States, FL, Jacksonville
Joined Mar 2012
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Mast Tube Foot

Mast Tube Foot for http://radiosailingshop.com.au/index...8dacd903a28a55 or http://radiosailingshop.com.au/index...roducts_id=511

Baron
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Old Dec 28, 2012, 08:25 AM
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United States, MI, Bloomfield Hills
Joined Feb 2010
535 Posts
I'm not sure you want either of those. One is too big and the other is for a deck mounted mast. I don't use anything to stop mast rotation other than the ram hitting the gooseneck.

I use one that is for the top (Item 119 in the Midwest Catalog)) and I cut off the little tab to make it fit the OD of the mast. Or I just make one out of delrin.

Ted
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Old Dec 28, 2012, 03:18 PM
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8387mike's Avatar
Perth Western Australia
Joined Jul 2009
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Quote:
Originally Posted by deafsail View Post
Cant find for Mast Heel for Mast tube foot . no Heel Fitting w/pin . Maybe use make one delin rod plug for Mast heel ?

Baron
Variant used to do a mast step plug, but what I use now is a mast head plug that is round or as Ted said use a normal head plug and shave off the vane holder
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Old Dec 29, 2012, 10:02 AM
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United Kingdom, Wales, The Mumbles
Joined Dec 2010
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A foam, filler foredeck plug ready for glassing and a little bit more done to the hull
http://www.rcgroups.com/forums/member.php?u=340972
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