Gene
Everybody (almost) has it figured out for their own car, and every car is
different. Some cars can't reach their ultimate top speed (i.e.. street
roadsters) because of tire spin because they are shaped like a brick and
spoilers aren't allowed. Some ( i.e.. streamliners) go very fast and
spoilers add too much to the air drag. Both choose lots of ballast in some
cases. Comparing the 2 1/4 speed to the 3-mile on the short course or the
incremental speeds (2 1/4,3,4,5) on the long course lets the tuner know what
the acceleration affects of a heavy car are. As Dave D. pointed out,
crashing a heavy car puts a much bigger strain on the rollcage (F=ma). In
the end you will figure it out, based on the needs of your car.
Dave the hayseed
----- Original Message -----
From: Gene Halvorson <ghalvorson@earthlink.net>
To: Land speed newsgroup <land-speed@autox.team.net>
Sent: Saturday, June 09, 2001 11:37 PM
Subject: Goodyear racing tires & tire slippage
Has anyone else used Goodyears "Blue Streak Special & Can Am" tire on the
salt? I'm thinking about purchasing a set for the rear to go along with
the front runners. If I use the 7.00-15 tire that has a 8.6" tread and a
26.7" overall diameter, I should go 205mph @ 6,356 rpm.
I wonder what the percent of slippage is though at top speed? Has anybody
figured it out? I'm guestimating it's less than 2%. In fact I wonder if
tire growth wouldn't almost counter the increase in rpm needed to offset
the slippage?
Any thoughts?
--- Gene Halvorson
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