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Sidcar wheel steering pro's & con's???
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swaybar2002



Joined: 26 Jan 2005
Posts: 380
Location: Central Pa.

PostPosted: Thu Feb 15, 2007 12:25 pm    Post subject: Reply with quote

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!
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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

PostPosted: Fri Feb 16, 2007 11:39 pm    Post subject: Reply with quote

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?
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swaybar2002



Joined: 26 Jan 2005
Posts: 380
Location: Central Pa.

PostPosted: Sat Mar 17, 2007 8:36 pm    Post subject: Reply with quote

>>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.
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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: 577
Location: Lexington, Ky

PostPosted: Sun Mar 18, 2007 12:02 am    Post subject: Reply with quote

Dam Big Grin
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docmike



Joined: 27 Jan 2005
Posts: 630
Location: Eastern NC

PostPosted: Mon Mar 19, 2007 12:58 pm    Post subject: Reply with quote

Never underestimate a hillbilly, whether from KY or PA. Laughing Laughing Laughing
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swaybar2002



Joined: 26 Jan 2005
Posts: 380
Location: Central Pa.

PostPosted: Mon Mar 19, 2007 8:40 pm    Post subject: Reply with quote

docmike wrote:
Never underestimate a hillbilly, whether from KY or PA. Laughing Laughing Laughing


Or North Carolina...nyuk nyuk.
We don't even have car washes in greater downtown Penns Creek what do I know.
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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: 825
Location: Massachusetts USA

PostPosted: Tue Mar 20, 2007 12:38 am    Post subject: Reply with quote

Ralph wrote:
Dam Big Grin


ditto!! Big Grin
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bmcsheehy



Joined: 22 Jan 2005
Posts: 972
Location: Massachusetts USA

PostPosted: Tue Mar 20, 2007 5:03 pm    Post subject: Reply with quote

Bubba
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High Performance Sidecaring... ...There is nothing "HACKED" about it.
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docmike



Joined: 27 Jan 2005
Posts: 630
Location: Eastern NC

PostPosted: Thu Mar 22, 2007 6:39 pm    Post subject: Reply with quote

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.)
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