About the Moth wing,

The moth are a very narrow and short monohull, Something like 10' long and 1' beam.

Feel free to look at the moth site for the current design

http://www.moth.asn.au/

There is one example of a wing on the title page

Basically, what they do is that they build their wings with straight aluminium tubes and they build carbon fiber sleeves and connection instead of bending or welding the tubes.

BTW when you will be shopping for your aluminium, there is Aluminium Pipe and Aluminium tube (also named hollow structural section). The diameter is usually different for the same nominal size: Tube is rated with the outside diameter, pipe is rated with their indide diameter but for pipe it changes with the dirrerent sizes.

Elbows are only available for the Pipe but you can use an elbow on a tube is the actual (measured) size is the same.

For example: A 4" pipe is usually 4.5" of outside diameter. A 4" pipe is actually 4" of outside diameter. The elbow will be 4.5" because the elbows are always built on the pipe size.

Finally, Tube is usually available with thinner wall setions than pipe.


Charles