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From the Operators Manual

power output:

a) 48 kW (64,4 hp SAE) at 6500 RPM;?

b) 40 kW (53,6 hp SAE) at 6000 RPM;

Match propeller to achieve above indicated full load r.p.m. as per engine version.?

Torque: a) 75 Nm (55,3 ft.lb.) at 6000 RPM; b) 68 Nm (50,1 ft.lb.) at 5500 RPM; Max. rpm.: a) 6800 RPM. b) 6400 RPM.

 

From the  Overhaul Manual

10)Operating parameters

Speed:

Take-off speed ......................................6800 RPM max. 5 min?

Take-off speed at 582 UL DCDI 40 ......6400 RPM max. 5 min

cruising speed ......................................6500 RPM

cruising speed at 582 UL DCDI 40 ......6000 RPM

Idle speed .............................................ca. 2000 RPM

Note the underlined italics. So, do I set prop pitch to achieve 6500 rpm in flight or 6800 rpm in flight?

  • Re: 582 DCDI 48kW RPM Limits/Prop Pitch

    by » 2 years ago


    If it were me I would strive for close to 6800 wide open straight and level if you want to get max HP. You just need to be careful you don’t overspend in a descent. 


  • Re: 582 DCDI 48kW RPM Limits/Prop Pitch

    by » 2 years ago


    Unless you are planning to use the engine in a closed-course Race Aircraft where the race is over in 5 minutes...
    I would set the pitch for Near 6800 at Vy in a takeoff Max climb attitude with the understanding that it may/will over-rev in low-level Flight.
    You will be reducing throttle once attaining a safe altitude in any case so this should not be an issue.
    Max RPM will naturally reduce at higher altitudes and throttling back in high-speed descents is always to be expected.

    One day, you may absolutely, positively need all the climb power you can get to clear an obstacle, but you will never "Need" 100% Max power as a cure for Get-There-Itis.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


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