[NSRCA-discussion] Elevator setup with anhedral stabs (observaton)

[Stuart Chale]

I just finished playing a bit with the elevator setup.  Unfortunately you
can't stop the servo test along its travel.  It reverts back to center.  The
long carbon rods are still useful even with the anhedral setup.  What I did
was to attach them to the elevators in the full down position.  (Radio
turned off to keep the servos in the hold position)  With the rods meeting
in the center they will separate as you go to neutral and up elevator.
Sighting from the side at the rods seems to work pretty well to compare the
two halves.  Not as accurate as when the rods are together for the entire
elevator travel, probably accurate enough.  It may be a bit harder to mix
out minor servo differences.  I think that the laser idea may work well if
aimed at the back of the two carbon rods.  Again minor differences are
accentuated by the length of the rods.  Of course how accurate is accurate
enough?  A question asked about much of what we do to set up our airplanes.
Based on my flying I definitely need all of the help I can get :)


I guess I will have to look for a laser to try :)

Thanks,
Stuart

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Steve Byrum
Sent: Friday, September 21, 2007 10:12 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Elevator setup with anhedral stabs

Guys

Walmart has a $10 level that does as Ed suggests.  I use it to set up
Curares for SPA.  Level the elevator at neutral with the laser on both ends
of the elevator.  Hold full up and elevate the laser.  If it doesn't still
hit both ends of the elevator, it's obvious which one is off.  Same with
down.

Semi high tech and cheap.  To elevate the laser, I use a scrap of 2-1/2 wide
aileron stock as a wedge.  Slide it under to elevate.  Pull it out to
depress.

Steve Byrum 
(256)737-9828


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt
Sent: Friday, September 21, 2007 8:51 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Elevator setup with anhedral stabs

Hi Stu:
Bushnell makes a nifty laser level that can be set for a point, a horizontal
line or a crosshair.  I've used the crosshair for this type of adjustment
with a flat stab and it works great.  I suspect that it might also work well
if you use it in a "scanning mode".  

What I normally do is just line up the vertical line on the rudder post, get
the stab set and then do the elevators.  The level has a magnetic base and
you can pivot it up & down on that base.  Now, for the anhedral stab it
might work well if you sight it at the root, then adjust up or down to site
a mid point, then again at the tips of the elevators.  Seems plausible
anyway.

Radio Shack was dumping these at half price for a while, not sure if you can
still find them there.

Ed

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Stuart Chale
Sent: Friday, September 21, 2007 8:24 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Elevator setup with anhedral stabs

I tried this question on RCU and didn't get any great answers so I thought I
would try here.

Does anyone have a good method for comparing the throw of both elevator
halves on anhedral stabs?  With a regular stab I use a 15 inch piece of 1/8
carbon fiber rod on each elevator meeting behind the rudder and compare
their track with movement of the elevator stick.  This is much more accurate
to me, than clip on throw meters or ruler measurements.  With anhedral stabs
the two rods will separate as you give up elevator and come together and
cross with down elevator.  I guess you can measure the height of the end of
the rod from the table at different positions but does anyone have a better
method?

Thanks,
Stuart


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