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Date: Mon, 19 Jul 2010 08:59:39 -0400
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References: <list-4397217@logan.com>
From: Chris Zavatson <chris_zavatson@yahoo.com>
Subject: Re: [LML] Re: Small tail, MK II tail, CG range
In-Reply-To: <list-4397217@logan.com>
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Scott,=0AInteresting find, certainly better than the previous one that did =
not take any =0Ahorizontal tail data into account.=0AI must present one cau=
tion when using this calculator.=A0 Even if we assume all =0Acalculation ar=
e done correctly, this calculator is=A0targeting the radio =0Acontrolled (R=
C) community.=A0 The calculator is determining the 'stick-fixed' =0Aneutral=
 point.=A0=A0This means=A0the elevator is assumed to be rigidly held in pla=
ce =0Avia electric servo or some other actuator.=A0=A0When this is true, th=
e=A0entire =0Ahorizontal stabilizer area=A0can=A0be=A0used in stability cal=
culations.=A0 In our =0Aplanes, the elevator is free to float=A0so the=A0ef=
fectiveness of the stabilizer =0Ais=A0reduced.=A0=A0When the=A0free elevato=
r is=A0added into the=A0calculations,=A0you end up =0Awith the 'stick-free'=
 neutral point.=A0 =A0I=A0mention=A0this=A0only because the simpler =0A'sti=
ck-fixed'=A0calculation produces an overly optimistic=A0result for our =0Aa=
pplication that might get someone in trouble.=0A=0AChris=A0Zavatson=0AN91CZ=
=0A360std.=0Awww.N91CZ.com=0A=0A=0A=0A=0A________________________________=
=0AFrom: "Sky2high@aol.com" <Sky2high@aol.com>=0ATo: lml@lancaironline.net=
=0ASent: Sun, July 18, 2010 5:35:49 AM=0ASubject: [LML] Re: Small tail, MK =
II tail, CG range=0A=0AHere is another calculator I found: http://adamone.r=
chomepage.com/cg2_calc.htm=0A=0AIt includes tail data.=A0 Drat, I did not g=
et those tail=A0measurements this time =0Aaround.=A0 But I will next time..=
...............=0A=0AScott Krueger=0A=0A=0A      
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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:arial, helvetica, sans-serif;font-size:1=
0pt"><DIV>Scott,</DIV>=0A<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial,=
 helvetica, sans-serif">=0A<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: time=
s new roman, new york, times, serif">=0A<DIV style=3D"FONT-SIZE: 10pt; FONT=
-FAMILY: arial, helvetica, sans-serif">=0A<DIV>Interesting find, certainly =
better than the previous one that did not take any horizontal tail data int=
o account.</DIV>=0A<DIV>I must present one caution when using this calculat=
or.&nbsp; Even if we assume all calculation are done correctly, this calcul=
ator is&nbsp;targeting the radio controlled (RC) community.&nbsp; The calcu=
lator is determining the 'stick-fixed' neutral point.&nbsp;&nbsp;This means=
&nbsp;the elevator is assumed to be rigidly held in place via electric serv=
o or some other actuator.&nbsp;&nbsp;When this is true, the&nbsp;entire hor=
izontal stabilizer area&nbsp;can&nbsp;be&nbsp;used in stability calculation=
s.&nbsp; In our planes, the elevator is free to float&nbsp;so the&nbsp;effe=
ctiveness of the stabilizer is&nbsp;reduced.&nbsp;&nbsp;When the&nbsp;free =
elevator is&nbsp;added into the&nbsp;calculations,&nbsp;you end up with the=
 'stick-free' neutral point.&nbsp; &nbsp;I&nbsp;mention&nbsp;this&nbsp;only=
 because the simpler 'stick-fixed'&nbsp;calculation produces an overly opti=
mistic&nbsp;result for our application that might get someone in trouble.</=
DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>Chris&nbsp;Zavatson</DIV>=0A<DIV>N91CZ</DIV=
>=0A<DIV>360std.</DIV>=0A<DIV><A href=3D"http://www.n91cz.com/" target=3D_b=
lank rel=3Dnofollow>www.N91CZ.com</A><BR></DIV>=0A<DIV style=3D"FONT-SIZE: =
10pt; FONT-FAMILY: arial, helvetica, sans-serif"><BR>=0A<DIV style=3D"FONT-=
SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif"><FONT fac=
e=3DTahoma size=3D2>=0A<HR SIZE=3D1>=0A<B><SPAN style=3D"FONT-WEIGHT: bold"=
>From:</SPAN></B> "Sky2high@aol.com" &lt;Sky2high@aol.com&gt;<BR><B><SPAN s=
tyle=3D"FONT-WEIGHT: bold">To:</SPAN></B> lml@lancaironline.net<BR><B><SPAN=
 style=3D"FONT-WEIGHT: bold">Sent:</SPAN></B> Sun, July 18, 2010 5:35:49 AM=
<BR><B><SPAN style=3D"FONT-WEIGHT: bold">Subject:</SPAN></B> [LML] Re: Smal=
l tail, MK II tail, CG range<BR></FONT><BR><FONT id=3Drole_document face=3D=
Arial color=3D#000000 size=3D2>=0A<DIV>Here is another calculator I found: =
http://adamone.rchomepage.com/cg2_calc.htm</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV=
>It includes tail data.&nbsp; Drat, I did not get those tail&nbsp;measureme=
nts this time around.&nbsp; But I will next time.................</DIV>=0A<=
DIV>&nbsp;</DIV>=0A<DIV>Scott Krueger</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>&nbs=
p;</DIV></FONT></DIV></DIV></DIV><BR></DIV></DIV></div><br>=0A=0A=0A=0A=0A=
=0A=0A=0A      </body></html>
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