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Beams to windward hull   Message List  
Reply | Forward Message #830 of 6619 |
Re: Beams to windward hull

-What is the price differential of carbon against glass, especially
by the time you add the extra resin needed for the glass?
Robert

-- In harryproa@..., "Tony Richardson"
<atrichardson@b...> wrote:
> As it is such a small boat I would suggest putting on what you
think will do and have a go.
> Ply box section beams are strong, light and easy to build.
> If you were a bit clever with glass you could overlay glass uni's
onto PVC drainpipe. Wrap the unis in mat and there is your beam.
Leave the PVC inside.
> No Rot problems
> How much glass and where etc? Experiment/Guess
> Rgs
> Tony
> ----- Original Message -----
> From: Todd
> To: harryproa@...
> Sent: Wednesday, January 14, 2004 4:29 AM
> Subject: [harryproa] Beams to windward hull
>
>
> How strong how light and of what material should the beams be
going
> to the weather hull on a 16' equal L an 8 ' beam ? I know I know
its
> only 16' but thats all the room I have and can afford. I was
thinking
> of maybe a 16 or 18'' center walkway between the hulls and two
> laminated 2x3s about two to three feet back from each bow
connecting
> the two hulls at each end. What do you think? To heavy, over
kill, or
> not strong enough?
>
> Todd
>
>
>
> To unsubscribe from this group, send an email to:
> harryproa-unsubscribe@...
>
>
>
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of
Service.
>
>
> [Non-text portions of this message have been removed]




Wed Jan 14, 2004 4:23 am

cateran1949
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Forward
Message #830 of 6619 |
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As it is such a small boat I would suggest putting on what you think will do and have a go. Ply box section beams are strong, light and easy to build. If you...
Tony Richardson
khsd16
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Jan 14, 2004
3:53 am

-What is the price differential of carbon against glass, especially by the time you add the extra resin needed for the glass? Robert -- In...
Robert
cateran1949
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Jan 14, 2004
4:23 am

G'day, There are a few variables, but basically, 400 gsm uni glass is about $15 per kg, 300 gsm carbon uni is about $150/kgand carbon tow is $30/kg, epoxy is ...
rob denney
proaharry
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Jan 14, 2004
5:18 am

This is my understanding of the problems of reinforcing. The glass can be too flexible to provide much support to the timber before it goes unless you really...
Robert
cateran1949
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Jan 14, 2004
7:04 am

Where can you find more information on building carbon mast and beams? Todd ... about $15 per ... epoxy is ... are ball ... glass, ... especially ... uni's ......
Todd
ntsrfer
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Jan 14, 2004
4:42 pm

-Todd, I went over the building of Harrigami and the pictures show the methods. The actual dimensions are another matter. The cost of carbon tow is starting to...
Robert
cateran1949
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Jan 19, 2004
1:41 am

G'day, The reason the booms are wood cored, yet masts are solid carbon is that the beams have to be stiffer (deflect less), therefore they are a bigger ...
rob denney
proaharry
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Jan 19, 2004
4:06 am

Makes sense, Hollow carbon stiffening would be a pain to produce and bucky tubes haven't yet come down in price. Thanks, Robert ... that the ... sufficient ......
Robert
cateran1949
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Jan 19, 2004
5:26 am

Hi!, Just building some trimaran cross beams, and want to talk about what I've found out. Apart from that I should be building a Harry proa - I found that in ...
doha720
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Jun 3, 2004
3:08 pm

... You wrote - You have to make a box section, nothing else is remotely comparable. I dissagree I'm no engineer but I do have a tri with round beams Rob and I...
Tony Richardson
khsd16
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Jun 3, 2004
11:18 pm

Horses for courses. It is hard to beat bamboo for ability to take loads and torque from all directions but if the bamboo was constrained with the load more in...
Robert
cateran1949
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Jun 4, 2004
1:22 am

I guess I don't know really about other things that I haven't seen, tried or heard about. I wonder what you mean by ring framed etc. I built a beam (markI), ...
doha720
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Jun 4, 2004
8:39 am

G'day Tony, I'm no certified engineer either, but what I said is right. I think you are saying that you made a hollow round section beam - for a proa? - which...
doha720
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Jun 4, 2004
8:22 am

Has anyone tried an omega shape Ω or variants of that shape for beams ? I remember the small Kendrick tri (scarab) having something similar Rgs Tony ... From:...
Tony Richardson
khsd16
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Jun 4, 2004
2:02 am

Sorry Tony, Is that an upper case omega or lower case? Can you give a more detailed description? Robert -- In harryproa@..., "Tony Richardson" ...
Robert
cateran1949
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Jun 4, 2004
2:28 am

I'm not sure if upper or lower case but I tried to paste it as a symbol into the email and by the looks of it it didn't work. The symbol looks like a 0 with...
Tony Richardson
khsd16
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Jun 4, 2004
6:13 am

As in measure of electric resistance in ohms sort of shape? I wonder if that may influence the effect that the glass I beleive has of being weak in...
doha720
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Jun 4, 2004
12:43 pm

Tony, Idiosyncrsies of our medium of communication. That's the upper case omega- as used in electronics to denote resistance. The lowercase looks like a...
Robert
cateran1949
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Jun 6, 2004
11:23 am

Robert Don,t worry about the math because I think Ray is an engineer and may have done it already. I thought they might be weak torsionally but because there...
Tony Richardson
khsd16
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Jun 7, 2004
12:59 am

Thanks Robert. Yes a lot of time, effort and experience goes into each part of the design and we contract the services of a very good composite engineer with a...
Mark Stephens
markstephens...
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Jun 5, 2004
4:14 am

Mark, Is the Elementarry building method similar to the Farrier vertical foam stripping building method? (http://www.f-boat.com/pages/construction/index.html) ...
Andrew Dickson
andrew@...
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Jun 5, 2004
7:53 am

MessageNo, Ian uses form frames and glasses one side only which then requires the outside surface to be fully faired after glassing. We will be making a female...
Mark Stephens
markstephens...
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Jun 6, 2004
6:32 am

Hi DOug The reason is I didn't want seastays They cause lots of drag when underwater, add weight, cost of fittings etc, take more time to initially fit up,...
Tony Richardson
khsd16
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Jun 7, 2004
12:37 am

To Tony, I've forgotten which reply I was making to you, but I remember talking about anything hollow meaning a box as opposed to something solid. I really...
Doug Haines
doha720
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Jun 14, 2004
8:33 am

Doug, The latest design of the Harry beams based on four carbon rods on the corners gives plenty of stiffness for the driving hull effect (See Marks comments)....
Robert
cateran1949
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Jun 14, 2004
10:21 pm

Gidday Doug We were talking about sections of beams Just a question but isn't a triangle section beam the lightest possible construction design type? I like...
Tony Richardson
khsd16
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Jun 14, 2004
11:28 pm

Tony, The extended bunk version is also my choice. Add to the list 'able to be transported relatively easily'. I plan to leave mine on the hard on my block...
Robert
cateran1949
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Jun 15, 2004
2:49 am

Tony, What do you mean you were talking about sections of beams? It sounded like a solid slab of timber - as in the '60's hartley plan! Weighed beam 1 today...
Doug Haines
doha720
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Jun 15, 2004
8:30 am

... (perpedicular ) strength except some glass in these photos as it seems kiri + carbon longditudinal? Doug, That much Kiri, prevented from buckling or being...
Robert
cateran1949
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Jun 16, 2004
1:16 am

Dear Robert, This is coming from a student remember - but I think you are talking about vertical shear which yes is not much. I'm talking about longitudinal...
Doug Haines
doha720
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Jun 16, 2004
8:39 am
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