> Ok, I was trying to learn something the hard way, that is figure it out. In
> particular, how do you properly use fiberglass to reinforce/fillet a fin
> Wha I have achieved so far:
> 1) On overpowering headache from the smell of the resin - Ok proper
> ventilation will help that.
> 2) A gooey sticky mess. Here is where I could use some pointers.
> Is it better to mix the resin, apply it to the airframe, and press the dry
> composite into the root or use a paper mache technique where you dip the
> composite in the resin and lay it down wet?
> If there is any reference material available, I'd appreciate it if anyone
> who can point me in the right direction.
I think you have two separate questions here; filleting and reinforcing.
ROL InfoCentral has some tips on glassing:
A Google search with "rocket fins fiberglass" should turn up a few
For reinforcing, I use thin epoxy (or *** thinned epoxy) on well
sanded tubes with the fins mounted. I cut out a piece of cloth to go
from fin tip, across the body tube, and to the tip of the adjacent fin
with the weave crossing the fin roots in an "X" pattern. Allow some
overlap on all fin edges. I wet the surfaces with a thin layer of epoxy,
lay the cloth from one fin tip to the other, and fill-in dry spots or
dab off wet spots. If you use thin (long setup time) epoxy, let it soak
in a few minutes before applying the cloth. After the epoxy dries, I
trim and sand the overlap. I use foam brushes for glassing. Work your
way from one point to another in laying the cloth, don't lay the entire
piece down at once. "Tugging" or pulling the cloth once it is down may
pull it up and away from the fin/tube joints. You want intimate contact
between the glass and rocket.
I don't have trouble with epoxy fillets cause I don't try to make them
perfect. ;) I use twenty or sixty minute epoxy, dab it along the joint
with a stick and let it "mold itself" into a fillet shape. I use
FillnFinish after the epoxy dries to make up for my chad application.
I accidentally stepped on a LMR cluster bird with TTW glassed fins
(don't ask). The only parts to survive were the fins.
summum jus, summa injuria est
To contact me; bollesg at comcast dot net