REFLECTOR:NG strut angelf

Tue, 17 Jun 2003 19:03:08 -0500

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If you remember the first velocity, it had a Long EZ type retractable =
nose gear and was a little different shape at the firewall. When Danny =
flew the first fixed gear Velo, I was down at  Sebastian in my Long EZ =
for a visit. When he landed, there was a shimmy and the nose fork =
departed, the nose strut dug into the runway and the Velo came to an =
immediate stop in a little cloud of dust. The strut tore off the =
bulkhead and punched into the panel. I remember as Danny was very =
peaved, he stated that the only part on the whole ********* airplane =
that he hired an outside engineer to design was the ******* nose gear =
and he ****ed it up.

The Long EZ plans call for the pivot shaft to be zero to 2 degrees raked =
bottom forward (from memory) and that is how I have always set it up.  =
In my opinion having the pivot shaft bottom aft can cause you some =
grief.
Herb Sanders
  ----- Original Message -----=20
  From: Al Gietzen=20
  To: reflector@tvbf.org=20
  Sent: Tuesday, June 17, 2003 10:39 AM
  Subject: RE: REFLECTOR:NG strut angelf

  Subject: REFLECTOR:NG strut angelf

  Hey,  just looking at it one would think that the strut angle should =
be negative, that is the lower end of the strut is REARWARD (NOT =
REWARD!) of the upper end.  But, take a look at a bicycle, a motorcycle =
front end.  There's more to this problem than meets the causal =
observer's eye.

  nolan.

  Nolan;

  Take another look at the bike - the axle is forward of the pivot =
centerline; therefore the vertical loading on the wheel produces a =
restoring force; i.e., trys to turn the wheel back to straight.  The =
castoring wheel on the Velocity the axle is behind the pivot.  A =
positive castor angle on the pivot means the vertical load on the wheel =
produces a force away from straight ahead - unstable condition.

  Seat of the pants engineering (sope) tells me that the castor angle =
should be neutral or negative; but I'll admit the gyroscopic forces are =
a factor that makes the issue more complex. Like would you expect that =
leaning into a left turn on a motorcycle you pull on the right handle =
bar?

  That same sope tells me that a round profile tire could change the =
dynamics considerable by changing the timing and magnitude of the =
restoring force due to the forward rolling of the wheel; I think for the =
better.  Still waiting for someone to try that.  I've got enough =
"firsts" on my airplane, I don't want to add another.

  Al

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<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue bgColor=3Dwhite>
<DIV><FONT face=3DArial size=3D2>If you remember the first velocity, it =
had a Long=20
EZ type retractable nose gear and was a little different shape at the =
firewall.=20
When Danny flew the first fixed gear Velo, I was down at&nbsp; Sebastian =
in my=20
Long EZ for a visit. When he landed, there was a shimmy and the nose =
fork=20
departed, the nose strut dug into the runway and the Velo came to an =
immediate=20
stop in a little cloud of dust. The strut tore off the bulkhead and =
punched into=20
the panel. I remember as Danny was very peaved, he stated that the only =
part on=20
the whole ********* airplane that he hired an outside engineer to design =
was the=20
******* nose gear and he ****ed it up.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The Long EZ plans call for the pivot =
shaft to be=20
zero to 2 degrees raked bottom forward (from memory) and that is how I =
have=20
always set it up.&nbsp; In my opinion having the pivot shaft bottom aft =
can=20
cause you some grief.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Herb Sanders</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dalventures@email.msn.com =
href=3D"mailto:alventures@email.msn.com">Al=20
  Gietzen</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
  href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, June 17, 2003 =
10:39=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:NG strut =

  angelf</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><B><FONT =
face=3DTahoma=20
  size=3D2><SPAN=20
  style=3D"FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">Subject:</SPAN></FONT></B><FONT=20
  face=3DTahoma size=3D2><SPAN style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Tahoma">=20
  REFLECTOR:NG strut angelf</SPAN></FONT></P>
  <P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3D"Times =
New Roman"=20
  size=3D3><SPAN style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <DIV>
  <P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3DArial =
size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hey,&nbsp; just looking =
at it one=20
  would think that the strut angle should be negative, that is the lower =
end of=20
  the strut is REARWARD (NOT REWARD!) of the upper end.&nbsp; But, take =
a look=20
  at a bicycle, a motorcycle front end.&nbsp; There's more to this =
problem than=20
  meets the causal observer's eye.</SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3DArial =
size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">nolan.</SPAN></FONT></P></DIV>
  <DIV>
  <P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3D"Times =
New Roman"=20
  size=3D3><SPAN style=3D"FONT-SIZE: 12pt"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana">Nolan;</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Take =
another look=20
  at the bike =96 the axle is forward of the pivot centerline; therefore =
the=20
  vertical loading on the wheel produces a restoring force; i.e., trys =
to turn=20
  the wheel back to straight.&nbsp; The castoring wheel on the Velocity =
the axle=20
  is behind the pivot.&nbsp; A positive castor angle on the pivot means =
the=20
  vertical load on the wheel produces a force away from straight ahead =
=96=20
  unstable condition.</SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana"></SPAN></FONT>&nbsp;</P>
  <P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue size=3D2><SPAN=20
  style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Seat of =
the pants=20
  engineering (sope) tells me that the castor angle should be neutral or =

negative; but I=92ll admit the gyroscopic forces are a factor that =
makes the=20
 issue more complex. Like would you expect that leaning into a left =
turn on a=20
 motorcycle you pull on the right handle bar?
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">That same =
sope=20
 tells me that a round profile tire could change the dynamics =
considerable by=20
 changing the timing and magnitude of the restoring force due to the =
forward=20
 rolling of the wheel; I think for the better. &nbsp;Still waiting for =
someone=20
 to try that.&nbsp; I=92ve got enough =93firsts=94 on my airplane, I =
don=92t want to=20
 add another.
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana">&nbsp;
 <SPAN=20
 style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana">Al</DIV></DIV></BLOCKQUOTE></BODY></HTML>

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