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Matt Dralle's RV-8 Project
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Date: 8-17-2009
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Number of Hours: 1.00
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Manual Reference:
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Brief Description: Mounting & Rigging The Mixture Control - Part 1
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HOBBS Meter: 1597 Hours
Airplanes have a manual mixture control. This controls the ratio of fuel-to-air ingested by the engine. The reason for this is the vast differences in density of air that an airplane engine can be subjected to in a short period of time. For example, if I take off from Livermore Airport, which is sea level, the air will be very dense. But if I climb to 8000 feet and head to Lake Tahoe, the air will be considerably thinner. You need to then adjust the fuel/air mixture manually to get a proper ratio.
The mixture control on the engine is a little bit of a trick to install. For some reason, the mixture on the throttle body works backwards so that means you need to have some sort of "contraption" to reverse the control so that when the pilot pushes in on the mixture they get Rich and they get Lean when they pull on it.
Fortunately, Van's supplies a engineering masterpiece that works amazingly well at this reversal necessity. It took a while to figure out where everything went, but once it was assembled, it went on pretty easily. You also have to move the control arm on the throttle body from the bottom to the top, which isn't entirely clear from the plans. Basically its just loosening a bolt and rotating the arm around.
It took a while to get the throw just right. The throw is just a little too long for the control, so I had to fiddle around quite a bit to get it to work correctly and centered on the quadrant lever. The time was well spent and the control works great now.
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Control Reversing Contraption
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Mixture Full Lean
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Mixture Full Rich
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Copyright © 2008-2024 Matt Dralle. All Rights Reserved.
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