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Date: Tue, 06 Mar 2012 07:39:36 -0500
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Subject: Re: [LML] LNC2 - Harminization between pitch and roll
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Bill is right.  Handling qualities are all about stick FORCE. Stick displac=
ement is not the issue, as long as you have enough room to push the stick a=
s far as you need.

Moving a pivot point in the linkage closer to the axis of rotation will inc=
rease stick force, and also reduce stick travel, for a given elevator displ=
acement (i.e. for a given aircraft response).  The Lancair 320 accomplished=
 this in the 1990's by changing the elevator weldment (the bracket bolted t=
o the elevator that the aft pushrod attaches to). The new weldment moved th=
e attach point 1 inch closer to the axis of rotation (just as Bill said).  =
But fear not, the earlier guys just drilled an extra hole in their weldment=
 and ignored the original hole.  In principle you can do this anywhere in t=
he system, but it seems to be easiest to implement out at the tail.

I have both weldments in my hangar.  The old one is kinda gold, almost as t=
hough it were cadmium plated like an AN bolt.  The new one is silver, almos=
t as though it were chrome plated.  But the bottom line is the number of in=
ches away from the pivot point.  If I recall correctly the new one is 2 poi=
nt something inches away and the old one is 3 point something inches.  (Big=
 help, huh?)  I would have to go to the hangar to check.

This mod is fairly benign. =20

Keeping the CG forward helps, too, but is harder to accomplish.  Moving a b=
attery from behind the seat to the front of the passenger footwell might be=
 worth investigating if you don't have rudder pedals there.

- Rob Wolf

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>Bill is right.&nbsp;&nbsp;Handling qualities are&nbsp;all about stick =
FORCE. Stick displacement is not the issue, as long as you have enough room=
 to push the stick as far as you need.</div>


<div>&nbsp;</div>


<div>Moving a pivot point in the linkage closer to the axis of rotation wil=
l increase stick force, and also reduce stick travel, for a given elevator =
displacement (i.e. for a given aircraft response).&nbsp; The Lancair 320 ac=
complished this in the 1990's by changing the elevator weldment (the bracke=
t bolted to the elevator that the aft pushrod attaches to). The new weldmen=
t moved the attach point 1 inch closer to the axis of rotation (just as Bil=
l said).&nbsp; But fear not, the earlier guys just drilled an extra hole in=
 their weldment and ignored the original hole.&nbsp; In principle you can d=
o this anywhere in the system, but it seems to be easiest to implement out =
at the tail.</div>


<div>&nbsp;</div>


<div>I have both weldments in my hangar.&nbsp; The old one is kinda gold, a=
lmost as though it were cadmium plated like an AN bolt.&nbsp; The new one i=
s silver, almost as though it were chrome plated.&nbsp; But the bottom line=
 is the number of inches away from the pivot point.&nbsp; If I recall corre=
ctly the new one is 2 point something inches away and the old one is 3 poin=
t something inches.&nbsp; (Big help, huh?)&nbsp; I would have to go to the =
hangar to check.</div>


<div>&nbsp;</div>


<div>This mod is fairly benign.&nbsp; </div>


<div>&nbsp;</div>


<div>Keeping the CG forward helps, too, but is harder to&nbsp;accomplish.&n=
bsp; Moving a battery from behind the seat to the front of the passenger fo=
otwell might be worth investigating if you don't have rudder pedals there.<=
/div>


<div>&nbsp;</div>


<div>- Rob Wolf</div>
</font>
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