Tue Sep 10, 2019 8:35 am
#1719404
Roger Lee is correct. The engine is much happier at 5100-5300 rpm.
People often run them in the 4000 range for the quieter flight it gives and ‘fuel saving’.
Saving a couple of litres an hour on an engine that’s frugal anyway seems futile at the expense of a costly gearbox.
Anything less than 4600 rpm in the cruise really isn’t good though. I’d rather buy a 1500 hour 912 that’s been run at 5300 all the time than a pandered one.
People often run them in the 4000 range for the quieter flight it gives and ‘fuel saving’.
Saving a couple of litres an hour on an engine that’s frugal anyway seems futile at the expense of a costly gearbox.
Anything less than 4600 rpm in the cruise really isn’t good though. I’d rather buy a 1500 hour 912 that’s been run at 5300 all the time than a pandered one.
Never criticise a man until you’ve flown a mile in his loafers.