Honeywell Vibrex 2000 - Flat Opposed General Rules; P&W R-985;2800; Radial Engine General Rules; Turbine Engines

Chapter 4 - Installation
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13841 Rev A
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4.5.4 P&W R-985/2800
Mount the Velocimeter in the horizontal position on the crank
shaft thrust plate immediately behind the propeller, using a
slotted Velocimeter bracket (the nut cannot be removed). It is not
necessary to mount a check Velocimeter on radial engines.
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.