REFLECTOR:NG strut angelf
Chuck Jensen
reflector@tvbf.org
Tue, 17 Jun 2003 12:29:57 -0400
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Al,
You suggested using a tire with a "round profile." Must be darn rough with
a square tire?
Chuck
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On Behalf Of
Al Gietzen
Sent: Tuesday, June 17, 2003 11:39 AM
To: reflector@tvbf.org
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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<DIV><SPAN class=639055815-17062003><FONT face=Arial color=#0000ff
size=2>Al,</FONT></SPAN></DIV>
<DIV><SPAN class=639055815-17062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=639055815-17062003><FONT face=Arial color=#0000ff size=2>You
suggested using a tire with a "round profile." Must be darn rough with a
square tire?</FONT></SPAN></DIV>
<DIV><SPAN class=639055815-17062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=639055815-17062003><FONT face=Arial color=#0000ff
size=2>Chuck</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org]<B>On Behalf Of </B>Al
Gietzen<BR><B>Sent:</B> Tuesday, June 17, 2003 11:39 AM<BR><B>To:</B>
reflector@tvbf.org<BR><B>Subject:</B> RE: REFLECTOR:NG strut
angelf<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><B><FONT face=Tahoma
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Subject:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
REFLECTOR:NG strut angelf</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">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.</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">nolan.</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Nolan;</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">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.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">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?</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">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.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Verdana color=blue size=2><SPAN
style="FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: Verdana">Al</SPAN></FONT></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>
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