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Constant Speed Prop Basics

Gemini Sparkle

Key Takeaways:

  • Prioritize safety by not adjusting power settings (throttle, prop, mixture) until reaching a safe altitude after takeoff, and typically only cycle the propeller once during runup.
  • Always adjust power by pulling the throttle back first then the prop to decrease power, and pushing the prop forward first then the throttle to increase power.
  • Disregard the outdated "over square" myth; flying with manifold pressure exceeding RPM is generally not harmful, but always consult the POH for specific cruise settings and operational limits.
  • Before landing, move the propeller lever to the full forward position as part of the GUMPS check to ensure maximum climb performance for a potential go-around, but avoid doing so too early to reduce cabin noise.
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Chances are you’ve come across descriptions of how constant-speed propellers work, oh, about a thousand times since your piloting days began. Instead of rehashing how they operate, let’s talk about tips you can use to get the most out of your constant-speed prop.

The first tip is offered with safety in mind: After you push the throttle full forward, gather momentum on the runway and lift off, don’t touch the throttle (black knob), propeller (blue knob) or mixture (red knob) until you’ve reached a safe altitude. After all, if something is going to break, it might do so because you moved one of these levers. It’s best to gain altitude before adjusting power settings.

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