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

[Del]

Hi Gray. 
 
I now fly Stylus and when I used to Fly Kraft had a similar case where elevator functioned was weak or none and ailerons and throttle did work but very sluggish. Plane kinda controlled crashed as I had enough juice after no other input as it crossed threshold to effect a slight flair. Airborne had 1 dead and 1 weak cell of 4 cell pack. Granted was FM modulation. Was told the assignment in receiver was elevator was after other servos thus why it appeared other servos were working when elev only barely worked at threshold.  So I would have to guess batteries from what I have experienced. 
 
    Del 
  ----- Original Message ----- 
  From: Gray E Fowler 
  To: General pattern discussion 
  Sent: Tuesday, September 02, 2008 10:01 AM
  Subject: 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 Fowler
  Senior Principal Chemical Engineer
  Radomes and Specialty Apertures
  Technical Staff Composites Engineering
  Raytheon 


        vicenterc at comcast.net 
        Sent by: nsrca-discussion-bounces at lists.nsrca.org 
        09/02/2008 08:44 AM Please respond to
              General pattern discussion <nsrca-discussion at lists.nsrca.org> 


       To General pattern discussion <nsrca-discussion at lists.nsrca.org>  
              cc  
              Subject Re: [NSRCA-discussion] Ideas on radio beserkness-cause of crash?? 

              

       



  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 Fowler
  Senior Principal Chemical Engineer
  Radomes and Specialty Apertures
  Technical Staff Composites Engineering
  Raytheon _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion 





------------------------------------------------------------------------------


  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - http://www.avg.com 
  Version: 8.0.169 / Virus Database: 270.6.14/1647 - Release Date: 9/2/2008 6:02 AM
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20080902/ac9f9ae4/attachment.html>