[s-cars] alignment Q

Thu Jan 15 06:15:18 PST 2009

Thanks again Dave, and sorry all again for the WOB but hey this is fun stuff.

I've got a wheel here with me.  If I camber it up max, it's merely riding on my desk on a razor thin edge of contact.  I'm having trouble (easy for me) envisioning where the scrub is being introduced.  Not that I'm doubting you just trying to understand.  Such camber 'appears' to have benefit of nearly zero surface contact aka friction.  Would this negate / outweigh any claimed scrub?

Appreciate any further insight here.

Maybe this is different than 'tires' as it's a hard plastic wheel?

Regarding wobble - these wheels do wobble on the axle some - any suggested remedies?  I'm drawing blanks.

and

Any thoughts as to good way to 'allow' for quick & easy alignment tweaks to the axles while still maintaining a solid axle mount?  I was trying to envision 'adjusters' like a hard staple or something, as glue is going to be cumbersome to try and set unset set unset set.

Jah, 930.  The Boy was insistent.  Hit it with like 10 coats of clear last night - hilarity.

*Tx again* all, mucho appreciatto...

-Paul

________________________________
From: djdawson2 at aol.com [mailto:djdawson2 at aol.com]
Sent: Wednesday, January 14, 2009 5:40 PM
To: Krasusky Paul (WQQ2PXK); s-car-list at audifans.com
Subject: Re: [s-cars] alignment Q

Toe would cause more scrub than camber.  I think the main goal for you is to minimize lost energy.  There is an energy loss associated with camber... look into motorcycle tire design.  High speeds, combined with a lean angle (essentially camber) generates extreme heat = lost energy.

Normally, derby car wheels are more like a motorcycle tire than a car tire... the contact surface has a radius instead of being flat.

Think of the pinpoint contact with the road surface.  Only at the exact point of contact is where the ideal situation exists.  As soon as the tire moves past that point of contact it is now "scrubbing" perpendicular to the direction of travel.  It's a little like taking a turn in a vehicle with a live axle... something has to scrub.

0 toe and 0 camber should provide the least energy loss.  I think wheels wobbling on axles would be a major concern.

Nice to hear it will be a 930  ;-)

-----Original Message-----
From: pkrasusky at ups.com
To: djdawson2 at aol.com; s-car-list at audifans.com
Sent: Wed, 14 Jan 2009 2:20 pm
Subject: RE: [s-cars] alignment Q

I would think toe causes more scrub

if camber scrubs... is it better than the full friction of the wheel surface area created by having zero camber?  Just wondering aloud.

Thanks Dave - good to hear from you btw...

-Paul

________________________________
From: djdawson2 at aol.com<mailto:djdawson2 at aol.com> [mailto:djdawson2 at aol.com<mailto:djdawson2 at aol.com?>]
Sent: Wednesday, January 14, 2009 4:19 PM
To: Krasusky Paul (WQQ2PXK); s-car-list at audifans.com<mailto:s-car-list at audifans.com>
Subject: Re: [s-cars] alignment Q

I can speak to camber...

Zero camber would be best.  Any camber causes a "scrub."

-----Original Message-----
From: pkrasusky at ups.com<mailto:pkrasusky at ups.com>
To: s-car-list at audifans.com<mailto:s-car-list at audifans.com>
Sent: Wed, 14 Jan 2009 1:23 pm
Subject: [s-cars] alignment Q

NAC, in fact it's a Porsche.

So The Boy insisted we make a 930 (of course) for his inaugural Pinewood Derby

this year - could he pick a more bulbous car?  Oy.  We're nearing completion and

ready to mount wheels.

Question for the Geekdom here - what is the 'fastest alignment' for a car that

only has to go down a straight hill?  I'm thinking maximum negative camber (to

decrease wheel surface friction on track) and zero toe - F&R.

Am I right?

Also - rules state cannot add bearings.  I just got the genius (I think) idea to

separate the wheel from its integral hub via a cut, and then glue the 'hub' onto

the car, polishing both contacting surfaces of wheel / hub.  Think 1) this would

be effective and 2) think it's legal?  We're not 'adding' anything and using

what's provided.  I do have a note in the Cubmaster on it, I can pretty much

guess the reply of course but figured I'd ask anyway.

Any other hotrodder tricks appreciated - we're already polishing the axles and

wheels and hubs best we can, using graphite lube, etc.

Insight appreciated - by Tyler 8-).

We pretty darn well nailed the 930 look - esp. the rear flanks and profile, and

front nose.  Unfort. rules dictate must use OE axle locations and then they

limit max width, result is a 930LWB.  Hindsight would have me approach the front

flares different and run them further into the doors - next time.  And the front

wheels are so close to the nose our ride height is more Rothman's 959 than 930

(maybe I should strip the Guard's Red and go with the Livery heh heh?) as

tucking the wheels any more up would hit them into the headlight area.  Ah well.

But it came out pretty darn kewl.

TIA!

-Paul

_______________________________________________

S-CAR-List mailing list

S-CAR-List at audifans.com<mailto:S-CAR-List at audifans.com>

http://www.audifans.com/mailman/listinfo/s-car-list

________________________________
A Good Credit Score is 700 or Above. See yours in just 2 easy steps!<http://pr.atwola.com/promoclk/100000075x1216817552x1201106465/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=82%26bcd=DecemailfooterNO82>

________________________________
________________________________
A Good Credit Score is 700 or Above. See yours in just 2 easy steps!<http://pr.atwola.com/promoclk/100000075x1216817552x1201106465/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=82%26bcd=DecemailfooterNO82>