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swaybar2002
Joined: 26 Jan 2005 Posts: 380 Location: Central Pa.
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Posted: Thu Feb 15, 2007 12:25 pm Post subject: |
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Hey Ralph...lets go fishin.
Ever get a lump in your thoat when you all of a suden think you forgot something? I just did. Do I owe you for a hat still? If so with interest the bill will probably be up into the six digit area...gulp! _________________ Claude Stanley
Founder: Internet Sidecar Owners Klub
http://autos.groups.yahoo.com/group/SCT/
2007
I.S.O.K Sidecar RON-DEE-VOO III ..
First full weekend in August!! Thursday through Sunday!!
Weikert, Pa ..more details coming |
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vintagegear
Joined: 26 Nov 2005 Posts: 14 Location: Portland. Oregon. USA
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Posted: Fri Feb 16, 2007 11:39 pm Post subject: |
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How about steering from an eccentric on the steering column?
the cam would steer only at acute angles (low speed), and would leave the wheel straight in all other conditions. Seems like a decent dampener would take care of most bump steer issues.
I'd think that fractional (ackerman) steering might have some benefits...
But wouldn't the tire slip angle be different depending on turning left or right? _________________ 'To invent you need a good imagination and a pile of junk'.
Thomas A. Edison |
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swaybar2002
Joined: 26 Jan 2005 Posts: 380 Location: Central Pa.
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Posted: Sat Mar 17, 2007 8:36 pm Post subject: |
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>>I'd think that fractional (ackerman) steering might have some benefits<<
Ackerman says that the tire on the inside of the turn turns around the radius of the turn it is rolling on as does the tire on the outside of the turn.So on a right hander with a right mounted sidecar the sidecar wheel will turn sharper than the front wheel of the bike and visa versa. I think any turn in the direction of the corner by the sidecar wheel woudl be a good thing in theory.
>>Seems like a decent dampener would take care of most bump steer issues.<<
Bumpsteer is defined as a wheel that steers itself when the suspension moves up and down through 'bump' and 'rebound'.This is related to the suspesnion design itself and shoudl not be confused with a wobble. A damper would only be a bandaid at best when speaking of curtailing bump steer.. It is true that a poorly installed damper could create a bump steer situation but to try and get rid of true bump steer by installing a damper is not really going to happen.
>>But wouldn't the tire slip angle be different depending on turning left or right?<<
Slip angle is the diference between the direction the wheel is pointing and the direction of the contact patch of the tire at the road surface. Some tires allow greater slip angles than other tires. High profile tires will create a more 'forgiving' ride as the limits of traction are obtained than some low profile tires due to the sidewalls taking up the slack so to speak. Ever notice how the low profile tires have a one ply sidewall? That in part is to help them have a better slip angle when pushed hard. In other wordS slip angle for a given tire is related to how much lateral flex there is in the sidewall of the tire.
If all things are the same..if we had the same tire on all wheels the tire that has the most load on it in a turn will be generating the greater slip angle. Greater load = greater slip angle for a given tire within the design limits of that tire of course.
We can manipulate slip angle forces with tire pressure variations, suspenion design and swaybar sizing. The loaded wheel will break loose first as a rule as that tire's slip angle will be maxed out first.
( Often thought of adding a swaybar of sorts between the rear and front suspensions on a CHS rig to allow the whole thing to sqaut under breaking but never got around to it. )
Okay it's someone elses turn now...LOL. _________________ Claude Stanley
Founder: Internet Sidecar Owners Klub
http://autos.groups.yahoo.com/group/SCT/
2007
I.S.O.K Sidecar RON-DEE-VOO III ..
First full weekend in August!! Thursday through Sunday!!
Weikert, Pa ..more details coming |
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Ralph
Joined: 27 Jan 2005 Posts: 603 Location: Lexington, Ky
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Posted: Sun Mar 18, 2007 12:02 am Post subject: |
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Dam _________________ "So Soon Old & So Late Smart" |
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docmike
Joined: 27 Jan 2005 Posts: 630 Location: Eastern NC
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Posted: Mon Mar 19, 2007 12:58 pm Post subject: |
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Never underestimate a hillbilly, whether from KY or PA. |
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swaybar2002
Joined: 26 Jan 2005 Posts: 380 Location: Central Pa.
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Posted: Mon Mar 19, 2007 8:40 pm Post subject: |
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docmike wrote: | Never underestimate a hillbilly, whether from KY or PA. |
Or North Carolina...nyuk nyuk.
We don't even have car washes in greater downtown Penns Creek what do I know. _________________ Claude Stanley
Founder: Internet Sidecar Owners Klub
http://autos.groups.yahoo.com/group/SCT/
2007
I.S.O.K Sidecar RON-DEE-VOO III ..
First full weekend in August!! Thursday through Sunday!!
Weikert, Pa ..more details coming |
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zentime
Joined: 22 Jan 2005 Posts: 837 Location: Massachusetts USA
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Posted: Tue Mar 20, 2007 12:38 am Post subject: |
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Ralph wrote: | Dam |
ditto!! |
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bmcsheehy
Joined: 22 Jan 2005 Posts: 991 Location: Massachusetts USA
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Posted: Tue Mar 20, 2007 5:03 pm Post subject: |
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_________________ Bill
High Performance Sidecaring... ...There is nothing "HACKED" about it.
2006 ZX-14 / HANNIGAN HP.
2011 Concourse / California Friendship III.
2016 Suzuki Bandit 1250s
1936 Ford Fordoor Humpback
www.Yankee-Engineering.com |
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docmike
Joined: 27 Jan 2005 Posts: 630 Location: Eastern NC
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Posted: Thu Mar 22, 2007 6:39 pm Post subject: |
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Quote: | Or North Carolina...nyuk nyuk. |
ain't no hill billys we're all flat landers around here
(to quote a Hay Seed Dixie song, got nothing against where the land is flat, gotta grow that corn some where and bring it up to where he's at.) _________________ Mike Currin
93 BMW K1100RS / EML Speed 2000
89 Honda GB 500 (6,700 miles, all original except tires)
67 Triumph 650 chopper
92 Suzuki GS500 (eldest son) |
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