"Stan Prevost" wrote in message
...

"BDS" wrote in message
t...
6000 ft
75% power (2400 rpm/32-in mp/26.3 gph)
IAS 157 kts
TAS 170 kts

16000 ft
75% power (2400 rpm/29.4-in mp/26.3 gph)
IAS 148 kts
TAS 187 kts


How come those are both 75% power? The high-altitude one seems like a
richer mixture, less power.



Less back pressure at altitude, less MP required for the same %power.
Note the fuel burn is the same.

Al G