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  #1  
Old 01-18-2013, 03:41 AM
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2 metre rc trimaran project

I'm building a 2 metre rc trimaran to a design by Andy McCulloch called 'Midnight Oil'. I'm currently working on a half hull of one of the floats. Still lots of work to do. The initial plug has been a learning experience and is pretty rough I might take a mold of it and cast a plug for final finishing then cast a finished mold off that faired plug.
Attached Thumbnails
2 metre rc trimaran project-2mtri-float-half.jpg  2 metre rc trimaran project-2mtri-float-side.jpg  2 metre rc trimaran project-2mtri-float-half-front.jpg  

2 metre rc trimaran project-mar2607_lrg.jpg  
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Old 01-18-2013, 04:44 AM
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Is it something like this?

http://www.youtube.com/watch?v=z-fZZJh-QYI


Looks like fun. Put a GoPro on yours and post the video when it's done.
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Old 01-18-2013, 06:56 AM
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It's not a foiling boat like the one shown in that video although it might be later if we add lifting foils the carbon build I have in mind should be light enough to make a decent foiler. Just looking to get a couple of boats on the water my father wants one too and I was thinking I'd build molds to lay up future boats to cover the inevitable purchase enquiries that will come when the boat is sailing. It will look something like the tri's in the following video except the plans show curved beams which is what I'll build



it will look something like the banque populaire 2m model shown on the following site.

http://www.multis2m.fr/
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Old 01-18-2013, 07:18 AM
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That RC BP-trimaran is great!

http://www.multis2m.fr/
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  #5  
Old 01-18-2013, 09:23 AM
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2m tri

Good Luck, Corley! In case you haven't seen it there is an RC thread on multihulls on SA: http://forums.sailinganarchy.com/ind...pic=82807&st=0
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Old 01-18-2013, 10:12 AM
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Thanks Doug, I've been watching the SA rc multi's thread with interest.
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  #7  
Old 01-24-2013, 05:35 AM
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Hey Corley, you should not build toy boats, continue with the 40 footer!!!!!!!

No, that was a joke! Enjoy the building and sailing. I'am doing the same this winter with my coastline flyer.

Why are you building the 2m tri? If I were you, I would build the Hughes 40 footer as a modell, that you are builing anyway.

Why are you making a mould? This is far too much work and far to complicated for a modell.

Fast and easy way:
Simply cut out the profile of the hull / amas out of 1mm plywood and some reference bulkheads (beams, transom, and 2 to 4 intermediates) .....

fill the gaps between bulkheads with styrofoam, glue them only with small spots of glue.

shape the foam into fair hulls just touching the bulkheads and profile with the sand paper.....

and make a glass/carbon layup. .

superfluous foam that is not needed for flotation is washed out with paint thinner. styrofoam melts imidiatly when in contact with thinner.


Have fun builing it!!!!!!

Michel
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Old 01-24-2013, 09:40 AM
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Quote:
Originally Posted by luckystrike View Post
Hey Corley, you should not build toy boats, continue with the 40 footer!!!!!!!

No, that was a joke! Enjoy the building and sailing. I'am doing the same this winter with my coastline flyer.

Why are you building the 2m tri? If I were you, I would build the Hughes 40 footer as a modell, that you are builing anyway.

Why are you making a mould? This is far too much work and far to complicated for a modell.

Fast and easy way:
Simply cut out the profile of the hull / amas out of 1mm plywood and some reference bulkheads (beams, transom, and 2 to 4 intermediates) .....

fill the gaps between bulkheads with styrofoam, glue them only with small spots of glue.

shape the foam into fair hulls just touching the bulkheads and profile with the sand paper.....

and make a glass/carbon layup. .

superfluous foam that is not needed for flotation is washed out with paint thinner. styrofoam melts imidiatly when in contact with thinner.


Have fun builing it!!!!!!

Michel
Thanks Michel, I'm aware there are faster ways of building the boat and considered using them but I've had interest from a few people about the boat and rc multihull sailing so I though I might as well produce female molds and build a limited number of boats and do some club racing rather than just a one off. I'll buy and supply with each boat a set of the original plans if the idea becomes a reality.
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Old 03-13-2013, 12:57 AM
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I've made some progress with this project and lifted a csm mold off the plug. Not perfect and some pinholes to fill but not bad for my first ever female mold. I've learnt a lot from the process and am confident I'll be able to do the other plugs in a fraction of the time. I'm quite happy with the finish of the casting and the finished half hull will need just a bit of tidying up when laminated it should provide a reasonable and repeatable result. Now I only need to build three more hull molds and two beam molds .
Attached Thumbnails
2 metre rc trimaran project-rc-float-project-float-hull-3.jpg  2 metre rc trimaran project-rc-float-half-hull-1.jpg  
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Old 03-13-2013, 07:07 AM
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I think you're right to do molds because it is almost impossible to do a model multihull at the extreme light weight of the competition boats without them.
Making a one off with an excellent finish is extremely difficult at a competitive weight.
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Old 04-19-2013, 06:06 PM
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I managed to get a bit more work done on this project lately. I've now set up the mold segments for float side 2 and the initial foam form has been rough shaped.
Attached Thumbnails
2 metre rc trimaran project-2-metre-mold-plug-float-side-3.jpg  2 metre rc trimaran project-2-metre-mold-plug-float-side-2.jpg  
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Old 09-28-2013, 05:32 PM
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I've nearly finished the plug for the second float hull side of the 2m Midnight Oil trimaran I've been gradually building my intention is make a female mold to cast some polyester plugs verify their accuracy and then make a final female mold when they are as close to perfect as I can get them. My plan when I'm finished is to make the boat easily demountable as it's square L/B so fairly unwieldy to transport assembled.
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Old 10-27-2013, 05:36 PM
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I made the female mold for the second float hull side over the weekend and pulled it off the plug today. It was generally a much better result I waxed the plug this time rather than just spraying with release compound and it came off much more easily. I'm going to cast a polyester plug from these molds to check their accuracy and symmetry they look pretty good but with the initial plug being hand faired it's hard to tell.
Attached Thumbnails
2 metre rc trimaran project-img-20131028-00131.jpg  2 metre rc trimaran project-img-20131028-00132.jpg  2 metre rc trimaran project-img-20131028-00133.jpg  

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  #14  
Old 10-28-2013, 02:18 AM
El_Guero El_Guero is offline
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I like that .... but it is a lot of work for 2 meters .... did you think about larger?
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  #15  
Old 10-28-2013, 02:57 AM
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^^ 2 metre is the largest (in size) acknowledged radio controlled class for racing, Mini40 rc multihulls probably have more competitors though. I do have some bigger boats on the go .
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