Originally Posted by
FlyingStone
If it's Arrow II with Hartzell prop, the only useful cruise RPM is 2400 rpm, which is too loud anyway. Other option would be 2000 rpm, but it's usually way too rough and the power reduction with that low RPM is very significant.
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The Lycoming powered Pa 28R have a restriction prohibiting continuous operation between 2000 and 2200 RPM. To imply that the only RPM choices is 2000 or 2400 is simply incorrect. When I flew the Arrow I usually used 22 in and 2300 RPM which at lower altitudes gave about 65% power and was smooth and reasonably quiet