[NSRCA-discussion] Elevator setup withanhedral stabs(observaton)

[Lance Van Nostrand]

OK, no one really posted a technique that they'd tried but here's my idea:

Carefully measure out from the center of the rudder post an equal amount on 
each side and insert a straight pin.

Lay a long CF rod across the pins that will remain straight for at least 
36".  This should now be perfectly horizontal (shim til it is)

Use your laser line to line up with the rod.  You need your laser line to 
have an azimuth adjustment.

Deflect your elevator and adjust azimuth to see if CF rod is still 
horzontal.

What do y'all think?

--Lance

----- Original Message ----- 
From: "Stuart Chale" <schale at optonline.net>
To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, September 23, 2007 6:07 PM
Subject: Re: [NSRCA-discussion] Elevator setup withanhedral 
stabs(observaton)


> Thanks for all of the ideas.  As I mentioned it turned out that you could 
> do
> a pretty good job at sighting the carbon rods from the side.  Have them 
> just
> meet at full down elevator and then they separate for any up elevator
> travel.  Not as good as when they stay next to each other as in a flat 
> stab
> but not too bad.
>
> I did go out and purchase a cross haired laser device.  I bought the self
> leveling Black and Decker with tripod from Sears.  This one self levels by
> gravity.  The crossed lasers are hanging from a pivot point inside of the
> unit. (Hopefully more accurate than the gravity pivot in a Robart 
> incidence
> meter)  It did seem to pretty reproducibly realign on the rudder edge once
> the plane was shimmed to match the vertical laser beam.  By using the 
> tripod
> the horizontal beam could be raised or lowered (a little rough in its
> movement and you had to let the laser relevel itself each time)  The
> horizontal beam could then be seen to hit the carbon rods at the right 
> point
> in elevator travel.  A little cumbersome method but it does seem to work.
>
> More importantly assuming that the laser is accurate in its 90 degree 
> lines
> I can see how this will greatly help in getting the wing square to the
> fuse/vertical fin.  Even tapered fins where a square is just an estimate 
> can
> be aligned as long as a center line is drawn on it.  Match up the laser 
> and
> the horizontal beam should allow accurate wing alignment.
>
> I am not sure if the self leveling unit is the way to go and I may look at
> other brands but I can definitely see keeping one in the workshop.  And oh
> yea it will definitely make putting up long rows of shelves, cabinets and
> dropped ceilings easier :)
>
> Stuart
>
>>>
>> -----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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