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Glad you got it back and it is repairable. Last year my son's plane
developed a problem while flying (9Z pcm) where the ailerons got very
slow almost unresponsive as well as the throttle. Also seemed to come
and go. We did get the plane on the ground and the culprit was also
the battery but a weld had come loose so the only thing holding one of
the metal battery to battery straps in place was the shrink wrap.
Twisting the battery while on an ESV located the problem to the
battery. The pack acted fine after resoldering the strap.<br>
<br>
Stuart C.<br>
<br>
Gray E Fowler wrote:
<blockquote
cite="mid:OFA3E54B1A.5C99B641-ON862574B9.004BD84D-862574B9.004E2C88@mck.us.ray.com"
type="cite"><br>
<font face="sans-serif" size="2">Lance and I went out and found the
plane
right where it was supposed to be. Do not know how I missed it the
first
day, so I am going to say that someone went into the woods Monday night
and moved it .</font>
<br>
<br>
<font face="sans-serif" size="2">What is amazing in the minimal
damage the plane has considering it went straight in from 200 feet,
albeit
at a slow speed. The horrible reverbed cracking sound Keith and I heard
was the carbon fiber wing tube breaking. Both wings have limited
leading
edge damage, the stab has a golfball size divot on the R LE, an easy to
repair crack in the fuse (buckle failure) behind one wing and a little
nose ring area damage. That is all.</font>
<br>
<br>
<font face="sans-serif" size="2">The battery pack had broken the 3/8
balsa sticks on impact that were bonded into place (my battery packs
are
not "removeable" per say) and the battey pack was on the ground
at the nose of the plane. The plane was standing vertical on the
undamage spinner being held up by the tree branches. Once we got
home we hooked eveything up and of course it all worked fine. Knowing
that
the battery pack essentially had the same charge as when the plane went
in, Lance took the battery pack home for diagnostics. Using the Robbe
charger he cycled the1450 mah pack down....it read 80 mah. He then
charged it and it read 1000 mah. Anthony described a NiMH "brown out"
and that is starting to make alot of sense. 6 volt packNiMH , drained
does not just die like a 4.8 volt NiCad. Also an important note is I
now
think the plane was going in and out of PCM lock. When I tested PCM
lock
the throttle did cut, but not to low idle. It cut to about 20% throttle
(programming error), hence the pulsing of the throttle that I
experienced.
If this diagnosis is correct then it is a testament to using PCM as I
was
able to fly the plane for 45 seconds before impact...had I been closer
when the problem started I may have even been able to score a "10"
FAI landing (not really-I would have gone for the grass instead of the
runway).</font>
<br>
<br>
<font face="sans-serif" size="2">Anyway I am sending the entire radio
off for examination, try to see why the battery was so low, and fix the
plane for spring.</font>
<br>
<br>
<font face="sans-serif" size="2">Thanks for the ideas</font>
<br>
<br>
<font face="sans-serif" size="2"> <br>
</font>
<br>
<font face="sans-serif" size="2"><br>
<br>
<br>
Gray Fowler<br>
Senior Principal Chemical Engineer<br>
Radomes and Specialty Apertures<br>
Technical Staff Composites Engineering<br>
Raytheon</font>
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