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Fromeco TNC Tach

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The Fromeco TNC Tach

In the mid-70's, an engineer named Tony Criscimagna invented a tachometer which still stands as one of the best in existence. Soon after, Tony started a business and sold thousands of these excellent tachometers under the tradename "TNC" (his initials). Skyborn Electronics (Powerflite) acquired the TNC from Tony around 2003, and continued to build the original design. Faced with the obsolescence of some critical components, Skyborn started to work on updating the design, but never completed this process. July 2005:
FROMECO Scale Avionics was presented with the welcome opportunity to acquire the TNC tachometer! We are exceptionally pleased to be able to reintroduce this outstanding product to the RC modeller community.


What we Changed

Processing:  The FROMECO TNC's "brain" has been totally revised, incorporating current microprocessor technology for 0.05% accuracy and improved functionality.
Durability:  FROMECO has re-engineered the tachometer's packaging.  The FROMECO TNC fully protects the sensor element, has an integrated battery compartment, and is more resistant to damage.
ON/OFF control:  The FROMECO TNC uses slider switch to turn the tachometer.
High RPM hold:  The revised tach displays both the current RPM and the highest RPM attained.  There are 5 significant digits for each measurement, for easy reading.
Upgraded components:  The new TNC uses an upgraded sensor element, easily capable of obtaining RPM measurements at 6 feet under most lighting conditions.  The components have been upgraded to surface mount technology, for reduced size and better durability.
Cost:  We are able to offer the new FROMECO TNC for only $95. (instead of the former price of $120.00)

What we didn't Change

Range:  The new TNC uses the same optical front end (the part that detects the propeller blades) as the original, with only minor revision for modernization of the parts.  A well-proven design!
Performance:  The readings are just as solid as one could expect from a TNC, even though the processing method is different.  The range is still excellent.  The accuracy is still outstanding.  We continually compared the revised design with about a half-dozen of the originals, to make sure the new one meets or exceeds the standard set by the original TNC tachometer.
"The Name":  Thanks, Tony, for a great tachometer!  Also thanks to Skyborn Electronics, for allowing us to bring this tool back to the RC community!

Tach Specifications
  Blade Count 2-3 by setting, 4 blade props use 2 blade setting divide by 2 ~ 6 blade turbines use 3 blade divide by 2.
  Power 9 Volt
  Range Up to 8 feet read instructions for possible limitations
  RPM Maximum accuracy achieved at RPM lower than 10K 0.05%

Not only is the TNC great for RC use, it also works very well for checking what we call "Full Scale" or General Aviation  (GA) props as well.   The TNC is an excellent device to keep you in dash Tach honest.  Or if you don't have a Tach at all.  

NOTE: The Fromeco TNC Tachometer is not a FAA certified instrument, nor will it ever be.

Works great for:

  • Ultra Lights
  • Light Sport
  • GA "Limited to 2 Blade and 3 Blade Birds"

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