REFLECTOR:NG strut angelf
Al Gietzen
reflector@tvbf.org
Tue, 17 Jun 2003 08:39:05 -0700
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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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<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma;font-weight:bold'>Subject:</=
span></font></b><font
size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'> REFLECTOR:NG
strut angelf</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;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=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>nolan.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Nolan;</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'> </span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>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=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'> </span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>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=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'> </span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>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=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'> </span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Al</span></font></p>
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