Re: Quickie Q1 Canard and wing foam cut
David J. Gall
Flax is inferior to highly-crystalline cellulose fiber for exactly the reasons mentioned below. Highly-crystalline cellulose fiber is nearly equivalent to E-glass in all respects except weight -- glass is much heavier -- and in sanding -- glass is itchier. Highly-crystalline cellulose fiber is mechanically derived from what would otherwise be wastes generated in lumber processing industries and is marketed worldwide under the trade name BioMid by Gordon Shank consulting. The roving is used as twine (you know it must be inexpensive!) in the hydroponics industry so availability will persist for a long time for numerous reasons. BioMid is available woven into cloth in the US from Absecon Mills and in Europe from FRP Services & Co (France).toggle quoted messageShow quoted text
From: main@Q-List.groups.io <main@Q-List.groups.io> On Behalf Of Rob de Bie
Sent: Thursday, September 16, 2021 11:04 AM
Subject: Re: [Q-List] Quickie Q1 Canard and wing foam cut
Bob, when you mentioned flax fibers I peaked my ears! I've worked a bit with flax composites some 15 years ago. Is the material mature enough to use in an aircraft? I remember problems like no suitable sizings being available to optimize fiber-resin adhesion, moisture content during curing leading to degraded resin adhesion & quality, and moisture absorption during use leading to lower properties.
Sounded to me like it would a lot more development before it would be safe to fly. But it was 15 years ago.
I also remember reading in an eighties issue of 'Homebuilt aircraft' magazine that hot-wet test specimens could be good indicator of the longer-term quality of the fiber-resin adhesion. Sounded reasonable to me.
On 16 Sep 2021 17:39, Robert Cringely wrote:
Thanks! I’m using a no-name 680cc aluminum air-cooled V2 diesel to