REFLECTOR:CG VS ROTATION

Sun, 25 May 2003 11:50:06 -0600

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NOTE:  I AM NOT ADVOCATING THIS FOR ANYONE.  IT IS FOR DISCUSSION
PURPOSES ONLY ... BUT INITIAL STATIC TESTS LOOK GOOD.  I AM NOT SURE I
WILL EVER USE IT.  BUT DISCOVERY IS FUN.
=20
I realize this is a controversial subject ... but here goes.  After all
... "experimental" is the name of the game.
=20
There has been an ongoing discussion about the weight and balance of the
Velocity regarding the CG (especially for those running a bigger engine
like an IO-540 in an Elite 173).  Even within the proper weight and
balance envelope - it can be very light in the nose.
=20
Alan Shaw has said in the past that the Velocity flew best when it was
within CG limits, yet very light in the nose.  He said the best CG for
flying is not always the best point of rotation on the ground.  He at
one time recommended that the gear be moved back slightly on those
non-XLs running the IO-540. =20
=20
Are there other solutions?  Yes ... ballast ... which he says often
spoils the flight characteristics.
=20
NOW FOR THE CONTROVERSY ... but think before you criticize:
=20
I have asked one of my engineer friends (aeronautical) to help me design
a modification for the nose gear.  The mechanism is solid and strong but
the actual use (other than static testing) has not been proven.
=20
In essence, when the gear is down and locked (over center) the plane it
at a slight negative angle of attack.  That makes ground handling
perfect.  Theoretically, it should make landing in cross winds a bit
more stable ... because once it's down, it's down ... the slight
negative angle makes a "no lift" situation.
=20
OK, but what about takeoff?
=20
The design includes an actuator (or a straight mechanical lever, if one
prefers) that raises the nose to "take-off" attitude.  It stays there
for the ground roll and take-off.
=20
Once up in the air, the gear retracts normally ... and the next time it
comes down, it is at the "lower" locked position.
=20
For touch and goes, you would have to activate the "take off" position
immediately upon touch down.
=20
OK, TELL ME I'M INSANE.  I can name many, many people who were called
that in the past ...
=20
=20
=20
=20

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NOTE:&nbsp; I =
AM NOT
ADVOCATING THIS FOR ANYONE.&nbsp; =
IT IS FOR
DISCUSSION PURPOSES ONLY ... BUT INITIAL STATIC TESTS LOOK GOOD.&nbsp; I AM NOT SURE I WILL EVER USE =
IT.&nbsp; BUT DISCOVERY IS =
FUN.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

I realize this is a controversial subject ... but =
here
goes.&nbsp; After all ... =
&#8220;experimental&#8221;
is the name of the game.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

There has been an ongoing discussion about the weight =
and
balance of the <st1:PersonName>Velocity</st1:=
PersonName> regarding
the CG (especially for those running a bigger engine like an IO-540 in =
an Elite
173). &nbsp;Even within the =
proper weight and
balance envelope &#8211; it can be very light in the =
nose.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Alan Shaw has said in the past that the =
</span></font><st1:PersonName><font
 size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Velocity</span></font></st1:=
PersonName><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> flew best
when it was within CG limits, yet very light in the nose.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>He said the best CG for flying =
is not always
the best point of rotation on the ground.<span =
style=3D'mso-spacerun:yes'>&nbsp;
</span>He at one time recommended that the gear be moved back slightly =
on those
non-XLs running the IO-540.<span style=3D'mso-spacerun:yes'>&nbsp; =
</span><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

Are there other solutions?&nbsp;
Yes ... ballast ... which he says often spoils the flight
characteristics.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

NOW FOR THE CONTROVERSY ... but think before you =
criticize:<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have asked one of my engineer friends =
(aeronautical) to
help me design a modification for the nose gear.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The mechanism is solid and =
strong but the
actual use (other than static testing) has not been =
proven.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

In essence, when the gear is down and locked (over =
center) the
plane it at a slight negative angle of attack.&nbsp;
That makes ground handling perfect.&nbsp;
Theoretically, it should make landing in cross winds a bit more =
stable
... because once it&#8217;s down, it&#8217;s down ... the slight =
negative angle
makes a &#8220;no lift&#8221; situation.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>OK, but what about =
takeoff?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The design includes an actuator (or a straight =
mechanical
lever, if one prefers) that raises the nose to &#8220;take-off&#8221;
attitude.<span style=3D'mso-spacerun:yes'>&nbsp; </span>It stays there =
for the ground
roll and take-off.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

Once up in the air, the gear retracts normally ... =
and the
next time it comes down, it is at the &#8220;lower&#8221; locked =
position.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>For touch and goes, you would have to activate the =
&#8220;take
off&#8221; position immediately upon touch =
down.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>OK, TELL ME I&#8217;M INSANE.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>I can name many, many people =
who were called
that in the past ...<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-spacerun:yes'>&nbsp;</span><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt;mso-no-proof:yes'>&nbsp;</span><o:p></o:p></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

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