[s-cars] alignment Q

[djdawson2 at aol.com]

 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] 
Sent: Wednesday, January 14, 2009 4:19 
  PM
To: Krasusky Paul (WQQ2PXK); 
  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
To: 
  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







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