Hi Dave,CFIDave wrote: ↑Sat Apr 03, 2021 9:23 pm The one thing that CAN affect performance very slightly is the propeller, since there may be 3 different props found on these aircraft:
- Wood-core (with composite covering) 3-blade MT
- Aluminum 2-blade Hartzell
- Composite black Hartzell with 2 scimitar (wider) blades
See attachment describing DA40 prop options (published back in 2008):
Maybe a dumb question. The document attached indicates the MT prop can run "2700RPM max continuous". The AFM checklists all indicate a max of 2400RPM "above safe altitude". And the power charts only go to 2400RPM. I always back down to 2400RPM >500'AGL on takeoff, then cruise 2200-2400. Section 2.4 limits max continuous RPM to 2400 and 7.9.1 limits max continuous power to 2400RPM at sea level and ISA. Can you actually run at 2700RPM (or anything above 2400?) continuously above some altitude? How much additional speed could be gained cruising at 2700RPM vs 2400? I always guessed that the limiting factor was the IO-360, not the prop. Does anyone exceed 2400RPM for any period of time other than take off?