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View Full Version : what are the pros and cons of a Constant Speed Propellor?



Ironman70
05-08-2004, 02:18 AM
what is it and what are it's advantages? Dissadvantages?

Ironman70
05-08-2004, 02:18 AM
what is it and what are it's advantages? Dissadvantages?

ptegomerpyle
05-08-2004, 03:28 AM
Its easier to note the advantages of a variable rate propellor.

Reduced take-off roll and Improved climb performance.

Improved fuel efficiency and greater range

Higher top speed

Steeper descent and shorter landing roll

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Ironman70
05-08-2004, 04:31 AM
How do you use and maintain a constant speed prop during cruising flight and combat maneauvers ? Climbing or descending?

Maple_Tiger
05-08-2004, 05:30 AM
Most alied planes use CPS.

This is what it says in the manual.

The pilot uses the prop control to set his desired engine RPM, while the propeller governer attempts to maintain the set RPM.


Thus, unlike manual prop pitch, you do not have to fiddle with it too much. But, it is your job to set the RPM. Then the governer will change prop pitch to keep it at the set RPM.


100% = Combat RPM for CPS systems.

75 to 80% = Cruise RPM. Once you set it to 75 to 80% the governer will automatical change prop pitch to keep the set RPM. Cruis should be about 2700 RPM i beleave.

By using Combat RPM too much and full throttlle, your engine will over heat. Plus, you'l use up more fuel.

When in a long climb, ill use 95% RPM setting, 95% throttle and rad on 2. This helps to keep the engine cooler and saves on fuel. Most of the time i will take only 25% fuel for the P-51, P-47 and P-38.

Capt. 361stMapleTiger.
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