Page 1 - Combined_39_OCR

INTER COMPANY CORRESPONDENCE
FILE DATE
CODE February 18, 197(
PLANT/OFFICE
TO - NAI iE
,EPT- Circuit
W. P. Wright ^Racing. Test Operations Space Huntsville.
FROM - NAME DEPT. DIVISION PLANT/OFFICE
J . E . Serocki 4820 Space Huntsville

SUBJi
Status Report on The Analysis of The Race Car Seat For The Talladega Track

Reference: ICC to II. P. Bruns from W. P. Wright. Subject: Analysis of vibration data from
Talladega Test, dated: 11 November 1969.

The current effort to reduce driver discomfort at the Talladega track is focused
on modifications to the Bostrom Viking torsion bar seat. This seat as it is manufactured
will accommodate driver weights between 130 and 270 pounds with excellent stability
features in the lateral direction. However, due to centrifugal forces acting in the curves
greatly increased static loading is anticipated. The range of these anticipated loads ar o
presented in the following calculations for a maximum driver weight of 230 pounds and P
minimum weight of 160 pounds.

Assume a radius of 1000 feet and a bank of 33 degrees, then the centrifugal force
equation

to
Mv
becomes
H!

w 86.044 x 10
= 2.67W at 200 mph, see sketch
32.2 1000

2.67 W Lateral

Vertical

This centrifugal force is divisible into two components, vertical (sin 33° = .54464) and
lateral (cos 33° = .83867). In addition to this load, the driver’s weight present if the
car were parked on the curve must be considered, see sketch.

84- 1 10- 7879 REV. 1-63