Vernier-AssistTM Throttle 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.
McFarlane’s patented Vernier-Assist™ offers the pilot precision control of the engine, unlike anything else on the market! The Vernier-Assist assembly operates on friction alone by simply turning the knob, with no threads or locking balls/pins. It also allows for normal coarse movement by pushing in or out on the knob. Unlike standard threaded vernier controls, this design cannot be jammed. The friction control provides smoothness and precision when operating the throttle and a friction lock secures the control in position, but it can be easily overridden in the case of an emergency. It is SAFE!
You asked for it and now we have it. Not only do we offer Vernier-Assist for non-certified aircraft and an extended line of FAA-PMA approved controls, the breakthrough design is now approved on throttle controls for Cessna, Piper, Beechcraft, Grumman, and Bellanca.
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.
US Patent No. 8,485,057 B1
MCTV Throttle Series:
The new Vernier-Assist 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 with 10-32 threaded end:
Throttle Control with 1/4-28 threaded end:
Throttle Control with 5/64" dia 1x7 twisted stainless steel wire end:
Dual Throttle Control with 1/16" dia 1x7 twisted stainless steel wire ends:
|OEM Part Number||McFarlane Part Number||Comment|
|Current McFarlane Product Catalog|
|2011-09-22 Vernier-Assist Mixture and Throttle Controls|
|Push-Pull Control Utilizing Linear & Rotational Input Patent # US 8,485,057 B1|
|Vernier-Assist Mixture Control Specifications|
|Vernier-Assist Throttle Control Specifications|
|McFarlane Newsletter 2009-12: Galvanized Cables, Wire Clamps, Gift Ideas|
|McFarlane Newsletter 2020-06-24: Beechcraft Baron and Bonanza Engine Controls, Cessna 200 Series Seat Rails, Coming Soon!|
|Extend the Life of Your McFarlane Throttle Control|
|Universal Vernier-Assist Control with Threaded End Installation Instructions|
|Universal Vernier-Assist Control with Wire End Installation Instructions|
|Vernier-Assist Mixture Control Installation Instructions|
|Vernier-Assist Piper Style Throttle Install Instructions|
|Vernier-Assist Standard Throttle and Dual Throttle Installation Instructions|
|Control Eligibility and Catalog Information|
I purchased a laser engraved knob and the thickness of the marking is very shallow. What kind of wear resistance can I expect?
Why is my new engine control too long/short?
What is the minimum bend radius for my engine control?
How do I trim my engine control to length?
My Vernier-Assist throttle control came apart during installation or maintenance. Can it be put back together?
My Vernier-Assist mixture control came apart during installation or maintenance. Can it be put back together?