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H. P* Bruns 3 March 10, 197 0

use of a Brush 6-channel recorder (loaned by local Brush representative) and
duplicate power supplies for a limited set of measurements including:

Longitudinal Acceleration
Engine Speed
Car Speed (prop shaft)
Lateral Acceleration
Yaw
Suspension Displacement

The system will car a 12 V DC to 120 AC sine wave inverter
in the test car along with the transducers , power supply, and Brush pen recorder,
The measurements will be recorded dire ct on the pen recorders in the test car.

b. Communication System

The pit-to-driver system was prepared and installed in the
Owens/Baker race car at Daytona during final speed week preparations for Daytona
500. Plans to install the system in R. Petty’s vehicle failed when Petty did not
supply a helmet for rework and installation of microphone and speaker components.

Several combinations of microphone/preamp earphone systems
were tried in Baker’s helmet before successful two-way transmission was achieved.

The system performed well during the 125 mile qualifying race
and during the 500 mile race. A mechanical vibration problem which shook loose
a screw in the hinge plate of the press -to-talk switch in the car during the 500 mile
race limited transmission to one-way (pit-to-car) late in the race.

The Owens’ crew adapted quickly to system installation checkout
and use during the races and treated the communication system as an integral
part of the race car system.

The press-to-talk switch has been replaced with a more reliable
witch design for future use.

Two 450 MC hand portable walkie talkie radios were loaned by
GE for trial during the 500 mile race activities. Engineering and Product Planning
personnel used the units successfully to communicate between the control center
and pit area for transmission of car position and pit stop information, etc. , during
the race. The radios performed perfectly and GE was asked to quote on a lease
of similar units.