60 Chadwick-Helmuth Company, Inc.
Chapter 4 - Installation
4.5.5 Flat Opposed General Rules
Mount the Velocimeter as close to the plane of rotation of the propeller as
possible, 90° to the piston travel. Stay within 6 to 8 in. from the engine
center line.
4.5.6 Radial Engine General Rules
Mount the Velocimeter as close to the plane of rotation of the propeller as
possible and 90° to the travel of the master cylinder (connected to the
master rod).
4.5.7 Turbine Engines
TPE-331 -
Use a vertical mounting (up or down) on the face of the
reduction gearbox. No survey Velocimeter is necessary.
NOTE: Many TPE-331 applications have manufacturer-specific
mounting locations.
PT-6A -
Mount the Velocimeter on the tachometer generator pad or the
over-speed governor pad (whichever is most easily accessible). Angle the
pads slightly in at the top. This action does not significantly affect the
signal from the Velocimeter. The Velocimeter may point up or down. No
survey Velocimeter is required.
4.5.8 Geared Reciprocating Engines
To determine the engine revolutions per minute (RPM) from the
photocell, check the engine data plate and apply the resulting ratio to the
tachometer reading from the propeller.
NOTE: The propeller tachometer signal from the photocell does not
match the engine tachometer RPM.
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