Don't use goop if you are a contest flier.
If you want to replace a servo or gear on field epoxy is the way to go.
Goop doesn't set for hours epoxy provides a bed for the servo to sit in,
then if you need to pop it out on the field it is easy. Then a dab of
thick ca will bond it right back in there instantly. With goop,go get
another plane... go home and the next day it will be ok... Seriously
guys, Daryl gave you guys a tried and trusted method of doing the
epoxy... it works... I received a plane with taped in servos and they
didn't come out easily. I also received a plane with shrink wrap that
too didn't come out easily. If you want a strong bond but removable just
epoxy it in, or add the weight and go with servo frames... But please
lets keep goop out of the contest goers planes. A guy did that and we
couldn't get a decent bond quickly even using CA the goop kept the CA
from bonding...
[EMAIL PROTECTED] wrote:
I use Goop. A dab about the size of a small pea on the four corners, then
press into place.
Actually I set the servo linkages up beforehand (arm angle, pushrod length etc -
totally complete), then when it comes time to mount the servos I plug in a RX
and turn the system on. With the servos in the neutral position I apply the
goop and roll the servo into the wing and press it down. unplug the RX and let
it dry.
The advantage of Goop is that at the microscopic level it it attaches itself to
the servo case's plastic much better than epoxy, and the glue joints will not
fail as catastrophically (with epoxy, an event that disloges the servo - does
so completely).
This process, along with also adhering to the inner surface of the servo cover,
makes for zero servo movement. Don't use too much Goop, getting the servo out
will be more difficult than epoxy, and (for the ashetically anal) the splooge
out the sides shrinks such that it may create an outline of the servo on the
upper surface.
Keep in mind that the reason epoxy works at all is not because it has adhered
to the servo case, but because it has created surface tension at the
microscopic level. A hard landing can disrupt this and the servo is now
floating around inside the servo bay. Unless you notice, chances are you would
launch again. Goop elliminates this possibility.
Quoting Tom Copp <[EMAIL PROTECTED]>:
This is easy, do a test. Find an old servo with a clean case. Mix up some 5
minute and micro about like mayonnaise. Put about a quarter size blob on the
servo case side and squish it to a piece of smooth clean 1/4 plywood and you
want to push down so the servo contacts the wing but not forces the wing
flat in one area, push down so the epoxy just rolls out all sides about
1/16. If you put too much then you get more roll out. So push down and get
the squeeze out and then just hold "light pressure" until it cures. Now
about 2 hours later try and pull it out.
Now sand the servo case with 150 grit, clean and repeat the test.
The un-sanded servo will hold well for most guys and easily come out in a
hard landing or when you want it to. The sanded servo will stay put in a
hard landing but still come out when you want it to but will take a little
more force.
Also add some 8oz glass or carbon to the wing skin to stiffen the servo area
if it has not been already done for you before you epoxy in servos.
Tom Copp
Composite Specialties
www.f3x.com
949-645-7032
-----Original Message-----
From: Corey Groves [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 02, 2006 8:14 AM
To: Soaring@airage.com
Subject: [RCSE] Epoxied servo techniques
That is something I know I would be very interested in. Based on the
comments here there seem to be a huge variance in techniques when
going for the glue-in approach. I have only seen two variations where
the servo is glued in using a bed of epoxy and micro balloons and is
either bare or wrapped in masking tape. But some people are describing
servos that pop out of the epoxy easily and others are describing
needing to grind the servos out.
Can those who have had really good luck with gluing there servos in
provide some insights?
Thanks for all the information,
Corey
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Simon Van Leeuwen
PnP Systems - The E-Harness of Choice
Radius Systems
Cogito Ergo Zoom
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Jeff Steifel
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