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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.






















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