wdleonard(at)gmail.com
Guest
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 Posted: Wed Jan 27, 2010 12:50 pm Post subject: pitch vs. roll, was: aileron trim - a NO vote |
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Having said that, I find the RV much more attention-demanding in pitch than in roll, such that the altitude hold is more help to me than the roll-axis A/P. I have both Trio units, but the altitude hold is the bigger labor saver.
-Bill B. �RV-6A
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Interesting, I think you are right "attention-demanding", but let me expand for the benefit of those anxiously awaiting the first flights of their RVs
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IMHO, the 'trimability' is much better in pitch than in roll, but holding altitude is much more attention-demanding.� Let me explain.
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With regard to flight in VMC, VFR:
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Using the stock manual pitch trim, it is fairly easy to trim to pretty much level flight - enough to go several minutes or more�without more than a couple hundred feet of altitude change.� With the stock manual aileron trim, several minutes of hands off flight will have you well away from desired heading.
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However, while hand flying it is easy to unconsciously maintain roll attitude and rough heading - you don't think about it at all.� Maintaining altitude, depending on how close you want to stick to your target, requires more or less constant vigilance.� It is very easy for an RV to drift up or down a couple hundred feet in a short period of time with very few sensory cues other than reference to the altimeter.� i.e. while pitch variations are easier to trim out, but�they are more difficult to unconsciously detect.� I think this is what Bill means by attention-demanding.
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The situation changes with hand flying�in IMC:
Now you remove the obvious visual cues of the horizon and IMHO roll attitude and heading�become significantly�more attention demanding than�than pitch attitude and altitude.� Perhaps that is because I removed my aileron trim long before I ever flew my RV�in IMC so I am comparing a system with trim, to one without trim.
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Anyway, I hope the discussion helped you to make the aileron trim decision..
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And Hmmm, maybe it is time for me to think about bucking up for that altitude hold...� 
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David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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