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

[Richard Strickland]

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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