Dynaflite GPMA0090 Butterfly - Manual (Page 6)

6
Types Of Wood
Balsa Basswood Plywood
Cyanoacrylate Glue
The most popular type of glue modelers use for
general construction of R/C models is Cyanoacrylate
or CA glues. Modelers build with CA because
it cures fast (immediately in some cases) and
the pieces do not have to be clamped or pinned
together as they do with traditional adhesives.
CA’s do, however have their own set of special
procedures and precautions that you should follow.
Always use CA in a well ventilated area. Open some
windows or place a fan in the room to circulate the
air. Do not lean directly over your work when you
use CA and look away while it cures or “sets off.”
CA can cure immediately upon contact with skin
so if you accidentally bond your fi ngers, do not
use vigorous motion to separate them. Use CA
Debonder (GPMR6039) or acetone (nail polish
remover) or soak your fi ngers in warm water for
a few minutes.
Never point the tip of a CA bottle
toward your face and be especially careful when
you unclog a CA tip. Hobbico CA Applicator Tips
(HCAR3780) are highly recommended and will
help keep the bottle from clogging. Keep paper
towels or tissues close by to immediately absorb
excess CA dropped on your model or work area.
Read all the warning labels on your CA bottle.
There are different viscosities of CA’s intended for
different conditions you will encounter when you
build. Thin CA is great for “tack-gluing,” for glue
joints that fi t well and for parts that are already
joined but need to be permanently bonded. Medium
CA is used for general construction where you apply
glue to one part, then join it to another part. Thick
CA is great for glue joints that don’t fi t perfectly
or parts that require a little time for positioning
before the glue cures. You will encounter many
other conditions that require one or the other types
of CA. For the Butterfl y all you really need is thin
and medium CA.
CA Accelerator is a chemical that you can spray
over uncured CA to make it cure immediately. A
mist spray of accelerator will do the job. Do not
inhale the vapors! Some modelers “preprime” the
parts to be glued with accelerator, join them, then
add the CA. This way the CA is guaranteed to cure
immediately. This prepriming is especially handy
when you use thin CA because it will cure before all
of the glue soaks into the wood away from the glue
joint. We do not recommend you build your entire
model with this method and use accelerator only
when necessary. Often, overspray from accelerator
used hours or even days earlier on nearby glue
joints will cause the CA you use on the next step to
cure prematurely and unexpectedly – so be careful!
Build the Tail Surfaces
Build the Fin
Place your building board on top of your fl at building
table. Position the plan sheet so the rudder and
fi n drawing is over your fl at building board. (Reroll
the plan sheet inside out to make it lie fl at or use
weights or tape to hold it down.) You may separate
the wing portion from the plan or fold the plan in
half to make it easier to work with. Cover the fi n
drawing with wax paper so the glue will not stick.
Refer to this photo while you build the fi n.
❏
1. Cut the fi n trailing edge from a 1/4" x 3/8"
x 36" balsa stick, then pin it over its location on
the plan. Many modelers fi nd that they can more