Hier ein interessanter Text von Gordon A. Feingold zum leanen einer SR22. Würde mich mal deine und die Meinung anderer SR22 Piloten interessieren.
NOTE: The specific fuel flow values listed below are for the IO-550 installed in the SR22. Different values are appropriate for the IO-360 installed in the SR20.
After start, and after the engine has warmed up for 2-3 minutes, lean the engine until a rise in RPM is noted. You know you’re in the right place if any further leaning results in roughness. Maintain this setting for taxi and runup (yes, runup), going to takeoff rich setting as you’re taking the runway. For taxi, you should be leaned “brutally” enough so that any attempt to set full throttle will result in the engine stumbling. (No, this will not hurt your engine – only your ego!)
TAKEOFF
The MFD should be on the EMAX page for takeoff. Use FULL RICH or set fuel flow according to the POH table for the pressure altitude. After application of full power, watch for all 6 EGT’s to rise in concert, and “sweep” the EMAX’s engine “gauges” to ensure all are in the green. During takeoff, note fuel flow. At sea level, you should be getting at least 28 GPH (for the SR22). If not, get your shop to adjust your fuel flow to obtain at least 28 GPH. If they balk, get another mechanic.
CLIMB
Just after takeoff, press the Normalize button the eMax page. You are capturing the takeoff EGT, which you will maintain by gradually leaning during the climb to altitude. I do this at 500’, and then switch to the MFD Map page, where I have the engine monitoring block displayed.
During climb, watch the display of normalized EGT. As you climb, the numbers will display increasing negative values (-10, -20, etc.). What you want to do is to maintain “0”. If you see negative numbers, you will lean the mixture. (I think: “minus means pull the red knob back, plus means push the red knob forward.”) Note that a bug in the MFD software exists such that any time you are at a normal- ized zero the engine data block will display dashes ---- for all three parameters! So until this bug is fixed you are actually trying to maintain “dashes” instead of zero.This bug was fixed in version 2 of the MFD software.
If you are given a step-climb intermediate level-off, pitch to level off and note your fuel flow. Then do a “Big mixture pull” (see below) and just leave it in that safe state until you get your clearance to resume climb. Then enrichen the mixture back to the fuel flow you had noted, and refine it to again maintain that normalized “0” EGT as you climb.
