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fuselage fabrication

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Bille
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Re: fuselage fabrication

Postby Bille » Sat Feb 03, 2018 7:56 pm

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Kevin Brooker
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Re: fuselage fabrication

Postby Kevin Brooker » Sat Feb 10, 2018 2:10 pm

Be sure to put a layer of glass between the Ti (or any other metal parts) and the CF. if CF is in context with metal there is a galvanic reaction (small electrical current caused by dis similar metals) and things will corrode. CF. is not metallic but is conductive andchwmically behaves like a metal in this situation.

To avoid wrinkles on wrapped tubes a piece of heat shrink over the layup will compress things and then stuff the tube into the bag. Pull a waxed cloth through he HS so it helps release. If you want to the sun the CF run it long and tie the ends to a bit of patacord or old kite line. Pull it tight. This will expelll extra resin and tension the fibers helping them stay put and also stiffening the layup.

You will waste a bit of material but composite work is highly consumable which runs up costs. Committing to using s bit more materials tends to make better parts so there is value

Intet sting thread

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tegirinenashi
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Re: fuselage fabrication

Postby tegirinenashi » Mon Feb 12, 2018 8:21 pm

Can somebody please clarify this "galvanic corrosion" idea that I hear over and over again? For any current to flow there has to be a potential, and what is the source of this potential? Is it coming out from nowhere, defying the law of conservation of energy?
Last edited by tegirinenashi on Mon Feb 12, 2018 8:52 pm, edited 2 times in total.

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jakemoore
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Re: fuselage fabrication

Postby jakemoore » Mon Feb 12, 2018 8:24 pm

tegirinenashi wrote:
Mon Feb 12, 2018 8:21 pm
Can somebody please clarify this "galvanic corrosion" idea that I hear over and over again? For any current to flow there has to be a potential, and what is the source of this potential? Is it coming out from nowhere, defying the law of conservation of energy?
https://en.wikipedia.org/wiki/Galvanic_corrosion
https://www.corrosionpedia.com/galvanic ... ers/2/1556

You probably use this every day as you oxidize the zinc in Alkaline batteries. In the composite example, carbon fiber conducts electricity along with attached metal pieces. Because carbon fiber is more noble than steel or aluminum, those metals are oxidized. Carbon fiber acts as a cathode where dissolved H+ and O2 are reduced. The chemical potential exists between dissolved oxygen, hydrogen ions, and the steel or aluminum anode.
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Re: fuselage fabrication

Postby TomW » Mon Feb 12, 2018 10:41 pm

T- Nashi-san,
just take their word for it, otherwise you have to get a PhD in solid state physics..

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Re: fuselage fabrication

Postby fluidity » Mon Apr 23, 2018 10:21 am

Shape up some Paulownia or other wood, sheathe with 2 layers of carbon fibre braid and wet in resin, cover with heat shrink and heatgun.

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downunder
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Re: fuselage fabrication

Postby downunder » Mon Apr 23, 2018 1:21 pm

Hmm u for real? :)

Pwood is so soft and with 2 layers it would bend like hell. I would know, built 3 already. Used hard wood for last two and wrapped it in 7 layers around mast. 2 layers with 45/45.

Now, that does not bend much. The test is to stand on it.

If not,the fuse will break just behind the mast.

Thoughts?


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