Turboprops engine tutorial?

[RobertoR]

Please, can anyone tell me where to find a tutorial for turboprop engine management? How and why and within which limits to control prop speed, torque, interstage temperature, oil pressure etc.?
Thank you

[Skittles]

I've done "some" looking and can't find a tutorial.  But I can tell you what little I've learned.

I mostly fly the Beech Baron, so I'll tell you what I do from take off,to cruising at 10000ft and to landing.

For take off, I set full pitch and mixture. Note: Full pitch is actually least pitch.  If the levers are forward, the props have least pitch and therefore take less of a bite of the air. Pulling the levers back increases the pitch and the props take more of a bite. The more the bite, the less RPMs.

As I'm climbing I leave everything alone until 5000ft. Once at 5000ft I reduce Mixure until it peaks on the fuel flow gauge. I do this again at 7500ft and continue every 2500ft until I reach cruise atitude.

At cruise altitude I pullback or increase pitch until the RPMs drop to the edge of the green area. Then I decrease mixture again until it peaks fuel flow.

Be sure auto-mixture is off or you'll see no affect.

That's about all I can help with. Anything else?

Joe

[RitterKreuz]

Managing turbo prop engines in flight should not be made to seem difficult... I'll try to break it down as simply as i can...

N1 is the percent power measurment of the centrifugal compressor... on the C90 i fly the compressor is capable of a speed of 37,500 RPM... so if you are running 10% N1 your compressor is turning out 3,750 Rpm. its just a percentage of the max speed of the compressor.

Torque can be thought of as your power setting... if comparing it to flying a light twin which im assuming you are trying to do, think of this as your manifold pressure. (They are not the same thing its just easier for you to think of it like this)

Prop RPM is just the same as in a light twin like the baron.

ITT is interstage turbine temperature... dont go over the red line... thats pretty much it! If you do you are limited to about 2 seconds before you buy a quarter million dollar engine.

Condition levers are basically setting the idle of the engine... high idle or low idle. High idle would be appropriate when using more systems such as air conditioning. Basically the more equipment you are running the higher the idle should be set by manipulating the condition levers.

On take off we place the prop levers full forward. and power levers are set to 100% N1 or about 12,500 lbs torque.

after takeoff the props can be reduced much like in a light twin down to about 2,000 rpm and for cruise around 1900 rpm.

in the C90 king air a near perfect approach power setting is 500 lbs torque this will box in your airspeed at about 110 kts with gear down and flaps set to approach. Prior to landing while on final place the prop levers full forward. This will have you prepared for a go around or missed approach and will allow you to go straight to reverse at touch down.

Im not sure what else to tell you... if you have any questions i didnt answer just ask something specific and we will all try

[RitterKreuz]

Im sorry i had a typo!

on takeoff 1,250 lbs torque not 12,500... put my comma wrong!! haha

hope i didnt screw you up!

c ya