Vernier-Assist Controls
FAQs for "Vernier-Assist Controls"
Frequently Asked Questions
How do I clean and sanitize a McFarlane Push-Pull Control?
We make the following cleaning and sanitizing recommendations to be completed between flights:
Recommended Cleaning Process
1. Put on clean disposable gloves prior to cleaning and disinfection.
2. Pull controls back to the fully retracted position to expose the full length of the control shafts.
3. Apply isopropyl alcohol to a clean microfiber towel. Do not spray any solution directly on the controls or any other surfaces or components in the aircraft.
!!! WARNING: DO NOT USE BLEACH WIPES ON ANY MCFARLANE CONTROL !!!
4. Gently and thoroughly wipe down every control knob surface and control shaft.
5. Let cleaning solution dry on these surfaces (contact time).
6. Use a clean and dry microfiber cloth to wipe away any solution residue left on knob and control shaft surface.
7. Remove all gloves, towels, and cleaning supplies from the work area in the aircraft.
Please contact McFarlane Sales directly at 866-920-2741 or 785-594-2741 or sales@mcfarlaneaviation.com if you have any additional questions regarding the disinfection of our controls.
How do I trim my engine control to length?
Please reference the Installation Instructions included with your new control.
I purchased a laser engraved knob and the thickness of the marking is very shallow. What kind of wear resistance can I expect?
The laser marking does not harm the hard durable anodize coating on the aluminum knob. The CO2 laser process only bleaches the color from the anodizing leaving a silver white color that contrasts with the surrounding dyed anodize. The durability of the laser marked area is not affected by the laser. Our tests have shown that the laser process actually improves the corrosion resistance of the anodize layer. The CO2 laser engraves aluminum knobs by vaporizing the surface leaving a deep durable groove. This groove is then filled with a special paint for contrast. The result is a durable long lasting mark.
What is the minimum bend radius for my engine control?
McFarlane's Storage and Packaging Specification requires a specific packaging minimum radius based on the length of the control, type of wire used, and the configuration of the control end(s). Please contact us to determine the exact requirements for your specific control.
Why is my new engine control too long/short?
There are several things that could be different such as engine/aircraft modifications, rigging/clocking of control arm or adjustment of rod end will be needed, placement of clamps or brackets may be different, or a previous installation change such as routing from original.
Vernier-Assist Propeller 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 controls for use on non-certified aircraft only. However, we plan to obtain FAA-PMA approval to offer the Vernier-Assist mechanism as an option on many of our currently approved controls for Cessna and Piper.
- Light weight and compact behind the dash
- Good hand space around the knob
- Safer - Our roller action cannot jam
- US Patent No. US 8,485,057 B1
- Assembly Video
MCVA Series Controls:
Although not specifically a prop control, the MCVA series controls can be used with 6730 Knob as a prop control for non-certified aircraft. Available in a variety of standard lengths or custom fabricated to your unique requirements.
Installation Instructions:
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Control with 0.061" diameter solid wire end:
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Control with 10-32 threaded end:
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Control with 1/4-28 threaded end:
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Control with 5/64" diameter 1x7 twisted stainless steel wire end:
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Dual Control with 1/16" diameter 1x7 twisted stainless steel wire ends:
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