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Math check

To: Land-speed@Autox.Team.Net (Landspeed)
Subject: Math check
From: Bobbyhotrods@comcast.net
Date: Sat, 01 Jan 2005 19:01:54 +0000
I lost the bookmarks to the good websites I'd been collecting when my 'puter 
locked up awhile back. Good opportunity to use my brain though...the riddle is 
the change gear ratio for my QC with 4:11 ring and pinion. The parameters are 
180 mph, 6500 rpm driveshaft and a 28" tire....
180 mph is 15, 840 fpm, or 190,00 inches/ min
a 28" tire goes 88" per revolution
I need 2160 axle rpm
With the 4:11 gears I need to overdrive the pinion around 36% approximately 
(wow).
How did I do? Thanks, Bob Jepson in Beantown






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