Best cruise

[severniae 78]

Hi All,I'm wondering what configuration you guys go for to obtain the best possible econimical cruise.I'm currently myself doing 27000ft with 2050 RPM and about 800 Lb-ft torque.Does this seem good or do you guys use better settings? Unfortunately carenado were a little scant on the old flying manuals!Regards,James

[Guest bstolle]

A jet engine is most economic at high altitudes which means FL270 is the altitude with the least fuel consumption.800ft/lb is above the P&W limit, nevertheless jetprop has mentions this value on their (non FAA approved) performance charts.600ft-lb is the P&W limit at FL270. most economic cruise at that flight level is at approx 400ft-lb.

[severniae 78]

Thanks Bstolle.So at that height what RPM on the prop should I be using? And also when i cruise at 800 it cruises along at 150Kts IAS - So should I be cruising slower than this?Thanks,James

[Guest bstolle]

Check your PM :( (All jetprop performance tables mention only 2200RPM for cruise)

Edited February 5, 2012 by bstolle