An inaccurate tachometer can waste performance, fuel and engine life. Mechanical tachometers are notoriously inaccurate and should be checked at each annual and 100 hour inspection or any time aircraft performance is in question. The TruTach II Optical Digital Tachometer measures the true speed of your propeller from inside or outside the aircraft. Just point it at the propeller or rotor blades and TruTach II will directly display the rotational speed with a resolution of 1 RPM. No connection to aircraft systems is required and measurements may be made at any speed setting from 240 to 70000 RPM.
Direct display is available for 2, 3, 4, and 5 blade propellers. Digital Signall Processing assures rock-solid display in single and multi-engine aircraft as well as helicopters. The compact 4-inch instrument weighs just 4 ounces and may be used with fast turning ultra-lights and kit plane propellers. Just turn it on, select the number of propeller blades and point. Automatic shut-off turns the unit off if you forget. The Tru Tach II includes a standard 9 volt battery providing 150 hours of operation.
Item works great...my tired Archer II tach was off by anywhere from 120 to 180 rpms....now I can set a power setting and get POH numbers.....especially good during long legs .....
My performance did not meet the book values (I know, it rarely does). Bought another brand of tachometer and the readout would come and go. Returned it and purchased this one, set it to three blades, set it on the glare shield and it works perfect every time. Found my RPM was off by about 160 RPM. Great to set the power knowing the true value (still about 4 knots under the book value but close).
What are the panel dimensions for the TruTach II?
The dimensions are 2-1/4" W x 1-7/16 H x 3-3/4" D. This product in not meant to be installed in a panel.
Does the Trutach II Optical Digital Tachometer come with a protective casing or box?
The Trutach II Optical Digital Tachometer is packaged inside of a box.
Do you have to set the Trutach II Optical Digital Tachometer for 2, 3 or4 blades every time you turn it on in a two blade C-172?
No, the Trutach II will store the desired number of blades and start with this input every time.
Does the Trutach II digital instrument remain on for the duration of flight, or is one constantly cycling it prior to altering engine parameters?
The Trutach II is able to monitor changes in RPM and display them in real time. There is no need to turn the instrument off during flight.
Does the TRUTACH II OPTICAL DIGITAL TACHOMETER Part # 10-01021 come calibrated or have the capibilities of being calibrated?
Per Trutach: The only calibration available is to switch from 2-5 prop blades.
Will it work if I put it on the glare shield inside the aircraft?
Yes, the Trutach II is intended to be put on the glare shield for prop reading.