Red aircraft performance at 17kft and above needs attention.
They are borderline unflyable at those attitudes due to;
1. engine shudder
2. automatically cycling prop pitch
Keeping throttle and propr at 100% (full fine) helps a little, but results in quick temperature gains.
Also, the mixture is pointless... at no altitude does changing the mixture result in any improved performance. leaning the mixture results in engine coughing at all altitudes.
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