Fire Extinguishers and Xmitter springs

[Gray E Fowler]

Wayne

How did all that sunlight UV get inside your transmitter? The plastic will 
only get brittle with time IF there is a plasticizer in it which in this 
case there is not...but what does happen is a problem called 
"creep"....(no offense). Creep is the "flowing" of the plastic when it is 
under a load, and those hooks are under a load 24/7 even worse when you 
have heavy duty springs. Eventually that hook will fail.
I flew Lances set up and hated those triple tight springs...seemed 
ridiculous to break a sweat to move the sticks.



Gray Fowler
Principal Chemical Engineer
Composites Engineering




"Wayne Galligan" <wgalligan at goodsonacura.com>
Sent by: discussion-request at nsrca.org
06/03/2004 07:18 AM
Please respond to discussion

 
        To:     <discussion at nsrca.org>
        cc: 
        Subject:        Re: Fire Extinguishers and Xmitter springs


OHH yesss.... just had that happen this last weekend.  I lost the rudder 
spring during a stall turn.  Then I had to land in 20 mph crosswind.  Very 
touchy with no feeling on the stick.  Had the aileron ones go out too 
about one month ago.   I think it has more to do with the age of the unit. 
My 8UA is about 8yrs old.  Plastic gets brittle with age and especially if 
it is expose to UV(sunlight).  All thought these little parts are shielded 
from the sun somewhat  I am sure there is still some exposure when left to 
Mother Nature.
AND of course they seem to break at the most inconvenient time...like 4 
days before a contest.  I guess that's better then during a good round in 
a contest.
 
Wayne G..
----- Original Message ----- 
From: Lance Van Nostrand 
To: discussion at nsrca.org 
Sent: Wednesday, June 02, 2004 11:34 PM
Subject: Re: Fire Extinguishers and Xmitter springs

A comment about those new springs:  I've now seen 3 transmitters break the 
plastic hook that holds the spring to the gimbal.  On gimbal broke twice!! 
first time on the plastic hook and the second on the gimbal side. Those 
plastic parts are nit designed for the load of the heavy duty springs.  My 
transmitter was one of these.  I now believe that they are a nice idea but 
an impractical one.
Be warned and be ready to land with no spring center.
--Lance
 
----- Original Message ----- 
From: Pattrnflyr at aol.com 
To: discussion at nsrca.org 
Sent: Wednesday, June 02, 2004 2:25 PM
Subject: Fire Extinguishers and Xmitter springs

Since all this talk about Li-Poly's and such, I was wondering what type 
and size fire extinguisher you guys would recommend for your shop.
 
Second question.  I recently replaced my gimbal springs with the Radio 
South heavy duty springs.  The stock springs had grease on them.  Anybody 
know what type grease you should use on your transmitter springs?
 
Thanks,
 
Bruce

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