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Vernier-Assist Controls

McFarlane invents a new type of vernier engine control

This new type of control has all the fine adjustment benefits of an old style push-button release vernier control, with the simplicity, responsiveness, and jam-proof safety of a friction lock control.

These light weight controls use a patented roller action and do not use a positive lock thread engagement. Coarse adjustments are made by pushing the knob inwards or pulling the knob outwards. Fine adjustments are made by rotating the knob clockwise or counterclockwise. For extreme conduit routing or heavy carburetor load installation, slight inward or outward assist pressure could be required during rotation.

We currently offer these new controls for use on non-certified aircraft only. However, we plan to obtain FAA-PMA approval to offer the new Vernier-AssistTM mechanism as an option on many of our currently approved controls for Cessna and Piper, as well as our popular MC600 universal mixture control.

  • Light weight and compact behind the dash
  • Good hand space around the knob 
  • Safer - Our roller action cannot jam 
  • US Patent No. 8,485,057
  • Vernier-Assist Assembly Video

MCMV Mixture Series:
Vernier action with only a 3/8" panel hole!

The new Vernier-AssistTM mixture control offers vernier action in a light weight, compact package. It is a drop in replacement for many existing non-vernier mixture controls because it only requires a 3/8" panel hole. It also only extends about 3.5 inches behind the dash making it ideal for aircraft with tight space constraints. Available in a variety of standard lengths or can be custom fabricated to your unique requirements.

Mixture Control Specifications

Mixture Control with 0.061" diameter solid wire end:
MCMV0241-LLL (knob included) or MCVA0241-03-LLL (without knob).


MCTV Throttle Series:
Vernier and friction lock - The best of both!

The new Vernier-AssistTM throttle control is adjustable for friction and vernier engagement and is available with three different end configurations. Requires a 3/4" panel hole. Available in a variety of standard lengths or can be custom fabricated to your unique requirements.

Throttle Control Specifications

Throttle Control with 10-32 threaded end:
MCTV1035-LLL (knob included) or MCVA1035-20-LLL (without knob).

Throttle Control with 1/4-28 threaded end: 
MCTV2035-LLL (knob included) or MCVA2035-20-LLL (without knob).

Throttle Control with 5/64" dia 1x7 twisted stainless steel wire end: 
MCTV3035-LLL (knob included) or MCVA3035-20-LLL (without knob). 

Dual Throttle Control with 1/16" dia 1x7 twisted stainless steel wire ends: 
MCTV0005DLLL (knob included) or MCVA0005-30DLLL (without knob).  

MCVA Universal Series:
Although not specifically a prop control, the MCVA series controls can be used with a 6730 Knob as a prop control for non-certified aircraft. Available in a variety of standard lengths or can be custom fabricated to your unique requirements.

Knob is not included. Requires a knob with 1/4-20 thread.

Control with 0.061" diameter solid wire end:

Control with 10-32 threaded end:

Control with 1/4-28 threaded end:

Control with 5/64" dia 1x7 twisted stainless steel wire end:

Dual Control with 1/16" dia 1x7 twisted stainless steel wire ends:

Updated: 4/16/2015

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