Hello:
Why that measures ? 20mm is more normal for me, but 19 ?
I use strong aluminum in my models. In carbon 20mm you can find tubes with 1 or 2mm of walls.
http://www.petrausch-modellbau.de
http://www.online-shop.carbon-compos...st=KAT11-10113
http://www.clipcarbono.com/es/100-30...o-1000mm-.html
Regards from Spain.
Carlos Marquez.
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www.cmjets.blogspot.com