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echo: rcm
to: MARK CORONA
from: KEVIN KLINE
date: 1995-12-24 06:13:00
subject: R/C AIRPLANE PROPS]

 > 
 >     You are kidding yourself if you think wooden props are safer.  A flyi
 > blade is just as dangerous from a wooden prop as from a plastic one.  The
 > will also cut meat just as well.
 > 
I'm not trying to say wood is safer once the blade is thrown.  But, damage 
to a wood prop will be much more apearant and visible thereby giving the 
owner the opportunity to replace it BEFORE it throws a blade.  Non wood 
props can often have damage that is not so readily detectable.  Then the 
owner wonders why it lost the blade in flight or some such.  This is what 
makes the wood better than the plastic (and I use plastic as a generic term 
to mean any non-wood or metal prop).  I've seen some guys fly plastic props 
that had 1/4 inch or more ground off the tips by hard landings or whatever. 
Never checked for more damage nor balance.  Bad for the engine, the airframe
and radio.  Yet they keep flying because they either don't know what they 
might be doing, don't care, or are too cheap to change the prop.  A wood 
prop hits that hard and it's broke.  No question about it, it has to be 
changed.
 >     APC props have been proven to be superior to wooden props because of 
 > their
 > computer aided design.
 > 
The same technology that designs and molds the plastic props can also be 
applied to the wood props.  Computers don't care what kind of material they 
work with.  And even if it wood props were CAD/CAM, (and they might be, I 
don't know) any responsible modeler would still check them for balance and I
for one would check them for pitch as well and still fine tune them.  But I 
enjoy working a prop.
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