Looking for light servo extensions: ABBRA--Related--Impact Q

Thu Apr 14 13:42:52 AKDT 2005

Thanks, Jim.  I suppose that was my point--had to move that hole up considerably to make it come out on both panels. Also, after measuring again and again(repeat 19X+), I finally arrived at a compromise location on my right panel as it seems to be symmetrical to the left except toward the root where it seems a bit lower(possibly the issue in Brian's post). Now I'll just go fly it.

Richard
  ----- Original Message ----- 
  From: Jim_Woodward at beaerospace.com 
  To: discussion at nsrca.org 
  Sent: Thursday, April 14, 2005 12:01 PM
  Subject: Re: Looking for light servo extensions: ABBRA--Related--Impact Q

  Hi Richard, 

  There is an extensive thread on this plane on RCU:  http://www.rcuniverse.com/forum/Composite_ARF_Impact/m_1732531/tm.htm 

  On mine, the holes in the fuse were somewhat close, however, the receiving hole of the pin was NOT drilled on the centerline of the wing TE.  Thus, instead of having 0.25 positive incidence as the initial fuselage holes aligned to, the "wings" ended up at -1 degree negative incidence!  Check your wings. 
  Jim W. 
  Team Futaba 

        "Richard Strickland" <richard.s at allied-callaway.com> 
        Sent by: discussion-request at nsrca.org 
        04/14/2005 12:13 PM Please respond to
              discussion at nsrca.org 

       To <discussion at nsrca.org>  
              cc  
              Subject Re: Looking for light servo extensions: ABBRA--Related--Impact Q 

  I decided just to go all pull-pull on Rudder and elevator to save weight on the 'E' Impact.  Not too crazy about the incidence set-up suggested.  To get the wing panels where I THINK they should go, I had to enlarge and raise the anti-rotation hole in the wing panel roots a little over an eighth which seems a little excessive.  Has anyone had a similar experience?  The hole originally was located toward the bottom of the wing and now it's roughly the same distance from the top.  In the building process the hole is not critical until the very end when you set the incidences.  Or have I royally screwed up?  Fuse is going to be light--but the wings weigh a ton. 

  Richard 
  ----- Original Message ----- 
  From: J.Oddino 
  To: discussion at nsrca.org 
  Sent: Thursday, April 14, 2005 10:46 AM 
  Subject: Re: Looking for light servo extensions: ABBRA 

  One thing you could do is build a special harness to go to the tail that consisted of two 18 ga. wires for power  and three 26 ga. wires for the rudder and two elevator servo signals (assumes three channels being used).  In the tail you could fan it out to three very short female connectors.  Not sure it is worth the trouble but could save weight. 
  Jim O 
  ----- Original Message ----- 
  From: vicenterc at comcast.net 
  To: discussion at nsrca.org ; discussion at nsrca.org 
  Cc: John Pavlick 
  Sent: Wednesday, April 13, 2005 11:42 AM 
  Subject: RE: Looking for light servo extensions: ABBRA 

  John: 

  I am sorry that took me so long.  The extra heavy duty extensions are in the plane and I can not weigh those.  I have 12" long JR extensions.  The heavy duty is 5 grs.  The light duty is 4 grms.  That is only 1 gr. difference but is 25% more than the light duty.  I think the extra heavy duty could be around 50% more or 8 grms.  We have a lot of extensions in the ABBRA gas version.  If we assume 8 ft of EHH exteansions we could save 32 grms. or 1.02 oz.  It is not much but it is 1 oz. 

  Vince 

  -------------- Original message -------------- 
  Vince, 
   Just wondering - how much do all of your servo extensions weigh right now? 
  John Pavlick
  http://www.idseng.com

  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of vicenterc at comcast.net
  Sent: Friday, April 08, 2005 1:30 PM
  To: NSRCA
  Subject: Looking for light servo extensions: ABBRA

  Hello all, 

  I need suggestions to make servo extensions as light as possible. This is for the new ABBRA with gasoline engine and we have the servos in the back to better balance the plane.  I think we can save some weight if we can get very light servo extensions.  We are using 4 digital servos JR 3241 in the tail.  One for each elevator and two pull-pull configuration for the rudder.  The plane right now is about 6 oz over 11 pounds and we are looking for places to reduce the weight. 

  Thanks, 

  Vince 

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