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

[Jim_Woodward at beaerospace.com]

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
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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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