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- Oct 19, 2005
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Was asked to post again under a search-able subject line, >>>
I've measured the motion at all 3 points and find that
its example of quantum in-determinacy entanglement
in the macro world existing in more than one mode at once.
This helped me configure Peel's tri- linkage iso stabilization
with some on purpose compliance at front and top links
but solid robust Patton style down low far away from rear isolastic.
Basic motor motion - w/o road loads > 66% up/dn - 33% fro/aft at front.
Rear iso is a pure pivot with front iso bouncing up/dn ~1/16"
either side of its rest position at static & steady engine speed.
On blip ups, front motion is mostly a jump up and slightly back
by another ~1/16" for ~3/16" total off rest position u/d, and
~1/16" fro/aft total.
Rear iso also slightly moves on blip ups ~1/32" fro/aft from rest
With road loads and tire thrust over lain on pure
engine oscillation, I see additional fro/aft front and rear iso
motion by another ~1/16". Seen by smeared oil grit/grime.
The witness marks left by entangling all the loads shows
an over all egg shape at front with the slightest bit of
bend into an arch > convex forward.
The top steady shows about half the size motion ~1/8"
total with most to the trace as fro/aft arc.
[Late Gerry Bristow gave me his flat plate steady with marks]
The rear iso trace shows mostly circular 1/16" OD orbit slightly
smeared more in fro/aft direction than up/dn.
The front iso traces out what looks like the classic
planetary atom symbol or planet Saturn/egg with two sets
of rings,
- a vertical egg ~3/16" with two rims standing proud of the
egg shell, vertical rim more prominent than equator rim.
Here's photo trace that's hard to do with marker
and bike vibrating and only two hands to work
throttle holding clamped pencil still. Someone do it better please.
http://thumb19.webshots.net/t/50/50/1/2 ... pYV_th.jpg
Going by above I've ordered new crank with 77% balance factor for
a 920cc. My reasoning is since most motion is at front up/dn
and solid mount racers move BF way up, I'd want ~1/3 more
fro/aft oscillation to round out orbital better for the
round isolastics and allow rear iso to share more loads.
I'll adjust head spring going by feel and tracing view.
Tricky to predict because designers kept cutting rubber
area by half and by half again and again till iso's isolated
@ ~2300 rpm. If more rubber area is contacted or more
od added with a 3rd or 4th isolastic, guess what you'l always
feel no matter the finely done install.
My current opinion is Norton made good compromise
by spending on least crank mass that iso's could just tolerate.
hobot
I've measured the motion at all 3 points and find that
its example of quantum in-determinacy entanglement
in the macro world existing in more than one mode at once.
This helped me configure Peel's tri- linkage iso stabilization
with some on purpose compliance at front and top links
but solid robust Patton style down low far away from rear isolastic.
Basic motor motion - w/o road loads > 66% up/dn - 33% fro/aft at front.
Rear iso is a pure pivot with front iso bouncing up/dn ~1/16"
either side of its rest position at static & steady engine speed.
On blip ups, front motion is mostly a jump up and slightly back
by another ~1/16" for ~3/16" total off rest position u/d, and
~1/16" fro/aft total.
Rear iso also slightly moves on blip ups ~1/32" fro/aft from rest
With road loads and tire thrust over lain on pure
engine oscillation, I see additional fro/aft front and rear iso
motion by another ~1/16". Seen by smeared oil grit/grime.
The witness marks left by entangling all the loads shows
an over all egg shape at front with the slightest bit of
bend into an arch > convex forward.
The top steady shows about half the size motion ~1/8"
total with most to the trace as fro/aft arc.
[Late Gerry Bristow gave me his flat plate steady with marks]
The rear iso trace shows mostly circular 1/16" OD orbit slightly
smeared more in fro/aft direction than up/dn.
The front iso traces out what looks like the classic
planetary atom symbol or planet Saturn/egg with two sets
of rings,
- a vertical egg ~3/16" with two rims standing proud of the
egg shell, vertical rim more prominent than equator rim.
Here's photo trace that's hard to do with marker
and bike vibrating and only two hands to work
throttle holding clamped pencil still. Someone do it better please.
http://thumb19.webshots.net/t/50/50/1/2 ... pYV_th.jpg
Going by above I've ordered new crank with 77% balance factor for
a 920cc. My reasoning is since most motion is at front up/dn
and solid mount racers move BF way up, I'd want ~1/3 more
fro/aft oscillation to round out orbital better for the
round isolastics and allow rear iso to share more loads.
I'll adjust head spring going by feel and tracing view.
Tricky to predict because designers kept cutting rubber
area by half and by half again and again till iso's isolated
@ ~2300 rpm. If more rubber area is contacted or more
od added with a 3rd or 4th isolastic, guess what you'l always
feel no matter the finely done install.
My current opinion is Norton made good compromise
by spending on least crank mass that iso's could just tolerate.
hobot
