The pilot operating manual list altitude, rpm, and manifold pressure for different % power, fuel rate, and air speeds. The minimum rpm listed for the Xtreme 210 hp 8KCAB is 2,350 rpm. I haven’t found a caution or restrictions for using slower rpm’s in the manual. Are there reasons not to use slower rpm’s? Thank you
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This isn’t answer, but an observation. Today while at 2,500 ft, 2,350 rpm, 21.8 in. Manifold , 65% power, hottest exhaust leaned to 1,465, the fuel flow was 8.9 gph and TAS was 127 mph. I reduced rpm from 2,350 to 2,200, and saw fuel flow decrease to about 8.4 gph. Manifold pressure increased slightly even though I didn’t move throttle. If the air speed changed, it wasn’t significant, appeared the same. It “seem” that the engine was running rougher. I repeated this several times with similar results. The air was choppy and not conducive to reliable observations. Because the engine appeared rougher, I will not run at less than 2,350 rpm without some
assurances that this is an acceptable engine/prop setting.