Technical > Jon's Wheel House

Light shields

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THE FRENCHTOWN FLYER:
Jon, I had a similar "shiny wheel" experience at Indy when I was in the beams for four seconds (as timed on a video replay) and went red with the trans brake set. Years later I related the story to a local Indy racer and he said he'd seen it a few times in the right lane. I was in the right lane that day.

dreracecar:
There is 2" of tire above the track surface before the rim edge, add another 3/4" before the light disc starts, So in no way does the disc have any effect with todays starting systems with the beams mounted so close to the racing surface. As to why there was a problem in PHX.? don't know  maybe the extra weight of the disc kept the front end down longer??? but its the 3rd (guard beam) photo cell that determinds red lights

THE FRENCHTOWN FLYER:
I thought a red lite is triggered when you roll past the "staged' beam before green. Only two lites at my tracks.

dreracecar:
Some tracks use 3 to deal with offset front ends, pass thru the guard beam while still in the regular start line beam and the tree goes red. If your track only uses 2 beams (pre-stage and stage) then blowing thru the stage beam early will go red

JrFuel Hayden:
Bruce, I have built a few tall 21" wheels, with 28" tall tires, that they race full tree classes, Comp Elim, Top Dragster, with legal offset axles, which of course gives them great 60' times, and reaction times, because they are blocking the beams longer. I compared  two cars roll out , one with 17", and one with 21" , the 21" has a 4 1/2 " head start on the start line. No red light because of 3'rd beam problems.
No advantage with a pro lite tree. 
Jon

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