Many moons ago, I put a dot each of 50% thinned Ambroid and Duco on my
glass build surface (1" dia) ...just to see what happened. I wiped the area
with alcohol and acetone before I did it to prep the surface. I had heard
about Ambroid drying and shrinking and Duco maybe not as much.
After a year, yeah, a year...the ambroid had gotten a bit more brittle and
the Duco was seemingly more pliable. Both were still "hard" and the
Ambroid did indeed start popping at the perimeter of the dot. The Ambroid
"broke" off and the Duco seemed more "pryable."
Adhesives either bond to a surface..the glass or boron or wire deal, or
they get into the pores of the wood and set up a structure of the parent
adhesive material (matrix)...cellulose and plastic(?). The strength of the
glue joint is then dependent of the mechanical strength of the dried matrix.
So, assuming that one had the "correct" amount of thinness, wicking and
glue into the joint, the long term properties of the adhesive would be the
issue.
Ambroid apparently gets more brittle and shrinks...Many of my "old" gas
models suffer this fate with glue joints fracturing, but I do not have any
long term experience with Duco... I crash a lot.
In any event, the usual indoor model longevity is probably not one to worry
about in adhesive aging, but the relative flexibility of the glue joint
might be of interest. Hence the Duco on tube seams and Ambroid on the
dihedral and rib joints where a stiffer adhesive is suggested?
Just an empirical thought.
Rick Pangell
Editor of "The Max-Out" Newsletter of
The Magnificent Mountain Men FF Club of Colorado
In a message dated 2/20/2011 7:46:18 A.M. Mountain Standard Time,
wdgowen_at_gmail.com writes:
Geoffrey
This might help explain why the boron comes loose on my F1M motorstick
whenever it's in storage for a long time.
----- Original Message -----
From: _Geoffrey Lefever_ (mailto:geoffreylefever_at_googlemail.com)
To: _Indoor_Construction_at_yahoogroups.com_
(mailto:Indoor_Construction_at_yahoogroups.com)
Sent: Sunday, February 20, 2011 8:22 AM
Subject: [Indoor_Construction] Re: Glue dilution
Just a couple of points which might be useful Both Duco and Ambroid are
good for general construction. Duco has a better grab factor and is much
more effective for seaming sticks and booms. Use Ambroid for Stick bracing
.Duco permits creep with 0.001 tungsten wire under tension. Increased stick
bow without realising it. Not good. Tan2May99
Received on Sun Feb 20 2011 - 08:25:51 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET