Prop Pitch question...

[Vidar_710]

Maybe this will clear things up. Let's keep it simple.

Throttle Levers control power and RPM from idol up to Flight power settings.
Prop Levers control and refine RPM and Prop Pitch.
Mixture Leverscontrol fuel flow.

*NOTE: Throttle does NOT have any input to prop pitch settings what-so-ever.

The reason for Constant Speed/Variable Pitch propellors is to Optimize the pitch of the propellor in conjuction with power -i.e.throttle- settings at various stages of flight.

High RPM/Low pitch with Hi power setting for take-offs.
Med-Hi RPM/Low Pitch with Medium Power setting for climb-outs.
Medium RPM/Medium Pitch with Medium Power setting for Cruise flight.
High RPM/Low pitch with Low power setting for final stage -i.e. last few hundred feet- before landing. WHY you ask?

1. The flat-low pitch helps slow the plane down.
2. The Low pitch/Hi RPM is readily available without danger of overspeeding via manifold presure inputs from the throttle for Go-Arounds proceedures.

Keep in mind...
Medium - Hi Power settings may only be a difference of 2" of Manifold Pressure, and Medium to Hi RPM may only range 200-300 RPM from max power back down to Cruise flight.

Depending on the power plant, there are specific limits to manifold pressure to specific RPM settings. You never want to put manifold pressure past the specified RPM setting.

Everything Mr Sniper has said is completley correct.



V