[NSRCA-discussion] Ideas on radio beserkness-cause of crash??

[Richard Strickland]

Yes, it was the Rx batt. and it almost pegged the meter b/4 that flight--and I check them each flight--cell was good...up to a point.  It was in the airplane when I bought it and was relatively new--from a name brand.  On closer inspection, one cell looked like it had a pin-hole and there was corrosion throughout.  Weird--but then again, Murphy follows me around...  
I switched to a 780 lipo with regulator, built a cheap tester with load, invested in a Cellpro 4 (FMA) so I could see what I was actually putting back in--202ma in (5) P09s with a couple extra manuevers (overs) ea. flight.  The advantages of this are a little less weight, consistent power, and more than adequate capacity.  As the power was used from flight to flight; the drop seemed pretty linear.  Do I trust it yet?  No--but it looks like I will with more experience.
RS



To: nsrca-discussion at lists.nsrca.orgFrom: gfowler at raytheon.comDate: Tue, 2 Sep 2008 09:01:20 -0500Subject: Re: [NSRCA-discussion] Ideas on radio beserkness-cause of crash??Tx battery totally fine 10.3 volts at crash...new pack was cycled and tested. I do not understand a low battery failure...From what I have seen with batteries either you got it or you do not. Gray FowlerSenior Principal Chemical EngineerRadomes and Specialty AperturesTechnical Staff Composites EngineeringRaytheon 



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09/02/2008 08:44 AM 




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Gray,   Sorry about your lost.  It think the biggest chance of failure were those parts that were new.  I think there is a good chance that you have infant battery failure.  I know that the chances are low but it could happen.  I assume tha you checked the TX battery and it is OK.     --Vicente "Vince" Bortone   -------------- Original message -------------- From: Gray E Fowler <gfowler at raytheon.com> Guys Yesterday on my 4th flight of the day my PCM Stylus went nuts. PCM program was set for idle throttle and about 5-6 clicks(trim wise) of up elevator-all other surfaces neutral, and this was tested as such by turning off the transmitter.  As I passed by center I noticed that I could not gain altitude and the the throttle started going from idle to high...then ailerons started oscillating small left-right deflections. I cut the throttle to the kill position but the engine persisted up-down bursts. I was able to do a 180 degree turn with aileron coming back to center...never losing altitude, but unable to change the altitude,elevator seemed unresponsive. As I passed by center again I was losing more and mo re con trol. The plane flew over the wooded area south of the field at about 200 feet high, I could not turn and the ailerons rolled the plane upside down and it went straight down into the trees. This whole episode last about 45 seconds. Cannot find the plane, and remnants of Gustav are headed my way. Plane was new had about 10 flights on it. New battery..NiMH 5 cell pack -no regulator (ran 5 cell packs for years, no regulator) Reciever-1999 Stylus PCM-never crashed, wrapped in foam New switch Transmitter-1999 Stylus, never been serviced, never had problems What would cause a PCM receiver to do such a thing? If I had and intermittent signal, once the receiver did get a signal the only two throttle signals should have been i dle (P CM hold) and off (transmitter).  I am going to send the transmitter in just to get checked. Thanks guys....Gray FowlerSenior Principal Chemical EngineerRadomes and Specialty AperturesTechnical Staff Composites EngineeringRaytheon _______________________________________________NSRCA-discussion mailing listNSRCA-discussion at lists.nsrca.orghttp://lists.nsrca.org/mailman/listinfo/nsrca-discussion 
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