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I am 5 hours into testing a new rv7a. O-320, new Hartzell c/s. Set to 24 square for cruise and the rpm periodically drops to 2350 for about 15 seconds and then recovers. The pitch change is audible so it isn?t a gauge issue. Original static rpm (first flight) was 2700, now 2600. Any thoughts?

Thanks, Laurie