McFarlane Aviation Products FAA-PMA Replacement Aircraft Parts

Vernier-Assist Prop Controls

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:

Control with 0.061" diameter solid wire end:
Order part number MCVA0241-03-LLL (LLL = length in inches)

Knob is not included. Requires a knob with 1/4-20 thread.
Available in 4, 6, 10 foot lengths
May be trimmed to length
Requires a 3/8" panel hole
Ideal for aircraft with tight space constraints! Extends ~3.5 inches behind the dash.

Control with 10-32 threaded end:
Order part number MCVA1035-20-LLL (LLL = length in inches)

Knob is not included. Requires a knob with 1/4-20 thread.
Available in 3, 4, 5, 6, 7, 8 foot lengths
Vernier and friction lock
Requires a 3/4" panel hole

Control with 1/4-28 threaded end:
Order part number MCVA2035-20-LLL (LLL = length in inches)

Knob is not included. Requires a knob with 1/4-20 thread.
Available in 3, 4, 5, 6, 7, 8 foot lengths
Vernier and friction lock
Requires a 3/4" panel hole

Control with 5/64" diameter 1x7 twisted stainless steel wire end:
Order part number MCVA3035-20-LLL (LLL = length in inches)

Knob is not included. Requires a knob with 1/4-20 thread.
Available in 4, 6, 8, 12 foot lengths
Vernier and friction lock
Includes 6515 Barrel Stop Assembly
Requires a 3/4" panel hole

Dual Control with 1/16" diameter 1x7 twisted stainless steel wire ends:
Order part number MCVA0005-30DLLL (LLL = length in inches)

Knob is not included. Requires a knob with 1/4-20 thread.
Available in 4, 6, 8, 12 foot lengths
Vernier and friction lock
Includes 6408 Hardware Kit
Perfect for Rotax 912/914 engines

Less Detail

The following search filters are active

Click the X next to a filter to remove it.

X Category: Vernier-Assist Prop Controls

Category Description

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