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Re: Wing ribs 09 Dec 2013 01:23 #428

The rod is actually fairly reasonable on costs. I believe the rod if properly engineered would not cost that much for say a fuselage. Making box beams or triangular beams with foam core and then triangulating them into structures wouldn't be that expensive.

A fuselage nose shell with nice shape and a triangulated tail or box truss structure covered with dacron would look great. Super light weight and simple.

You can always sell the house. :-) Just my 2 cents.

Karl

--- In This email address is being protected from spambots. You need JavaScript enabled to view it., "Philip Lardner" wrote:
>
> I investigated pultruded carbon tubing also and even purchased a sample:
>
> www.easycomposites.co.uk/products/carbon...ction/carbon-fibre-b
> ox-section-8mm-7mm.aspx
>
> This stuff is incredibly light and would be ideal for the straight sections
> of the ribs and particularly or making up the flaperon ribs. There are two
> down-sides to this stuff: at 0.5mm wall thickness it is rather easy to
> crush, and the other problem is... the price! I calculated the number of
> meters of this stuff I'd need and then hid behind the sofa when I worked out
> the price! It *is* a beautiful product, though, and very light weight.
>
> Phil.
>
> _____
>
> From: This email address is being protected from spambots. You need JavaScript enabled to view it.
> [This email address is being protected from spambots. You need JavaScript enabled to view it.] On Behalf Of Kenny
> Andersen
> Sent: 06 March 2012 00:05
> To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> Subject: Re: [Carbondragonbuildersandpilots] Re: Wing ribs
>
>
>
>
>
> Karl,
>
> I wasn't referring to the rod, but to the tubing. The rod bends quite
> easily, but the tubing does not. I'm thinking something along the lines of
> the basic wooden rib only mad from hollow composite. In this application
> (as opposed to the wing spar) there would be a minimum length to get all of
> the load sheared into the rod. I'm thinking MAYBE the uni tape might be
> more apropos on the rib caps?
>
> --- On Mon, 3/5/12, KarlS <kschneider@...> wrote:
>
>
>
> From: KarlS <kschneider@...>
> Subject: [Carbondragonbuildersandpilots] Re: Wing ribs
> To: This email address is being protected from spambots. You need JavaScript enabled to view it.
> Date: Monday, March 5, 2012, 5:59 PM
>
>
>
>
> Kenny,
> We have been using this .125 rod for model aircraft spars. The .125 rod in
> the 12 foot lengths come shipped in about a 2 foot diameter roll. It bends
> easily and would go around the curature of the wing rib without a problem.
>
> www.aircraftspruce.com/catalog/mepages/graphliterod.php
>
> Jim Marske also sold a variety of square rod that may work better. I'm not
> sure if he still sells it or not.
>
> Rick Mullen might be able to answer that.
>
> Karl
>
> --- In This email address is being protected from spambots. You need JavaScript enabled to view it., Kenny Andersen
> <kennyrayandersen@> wrote:
> >
> > I've given this some thought and think it MIGHT be possible; BUT, you'd
> have to make your own rods due to the curvature issues that Phil pointed
> out. Â Also, most rods are actually TOO robust for what we are doing. Â I
> was thinking more like square Carbon tubes so that you still had
> significant area to bond to, and I completely agree with Phil -- you'd want
> some type of gusset at the joints. However, if you used square tube, I think
> you could bond them all rather than use a mechanical attachment. Â Where
> there is a will there is a way. Â I was thinking you could make the tubes,
> as a minimum, out of unidirectional tape wrapped in the 2 oz glass. Â Maybe
> 3/4 X 3/4 test that and see what it got you...
> > You likely have to make the curved ones over foam, then eat the foam out
> with something... Â Just a thought.

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