Vernier vs. Lever Style Engine Controls – RV10

Here is a photo of the engine control quadrant that I installed on my RV-10. I always thought that I would like to have the same style lever quadrant that was in the Piper PA-28-140 that I learned to fly in.

Although this unit is very well made and operates smoothly, I have found it to be difficult to use in my RV-10. The main reason for this is the mounting position and the resolution you can attain for micro adjusting the levers.

After having flown a number of Cessnas over the years, I have some experience with vernier type push-pull throttle and mixture cables. In a C172 you do not need to worry about fine adjustments as few of them have engine analyzers.

The RV-10 on the other hand, is more akin to a Bonanza than the lowly 172 and requires that you be able to set the engine to meet specific parameters such as manifold pressure and cylinder head temperatures. My RV-10 doesn’t have these but it is still difficult to set the exact throttle position correctly using the lever design. With it you are forced to move the lever using your thumb at its base which becomes uncomfortable over a short time.

I guess that I have to admit that I am wrong on this one and now I have to rip out the current cables and replace them with vernier type replacements.This will give me the finite control of the engine that a plane of this speed and complexity requires.

Blue Skies,

Dave

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