Help Understanding Piston Engines w/Constant Speed Propellers

[CaptainRude91]

I’ve added some of the info in this thread into guides:

[Advanced GUIDE] Constant Speed Propeller System

Introduction The purpose behind the constant speed propeller system is to achieve a high propulsive efficiency over a wide speed range. A fixed pitch propeller is only efficient over a very small speed range. A fixed pitch propeller optimized for climb will have good performance during take-off and climb (low speed) but during cruise the blade angle is too low. A fixed pitch propeller optimized for cruise has good cruise performance (high speed), but during take-off the blade angle is too larg…

[Advanced GUIDE] Free-turbine Turboprop Engines

Introduction Lets start with saying that there are two types of turboprop engines. A fixed shaft engine works essentially the same as a piston engine with constant speed propeller. Manifold pressure is replaced by a torque gauge, there is a reduction gearbox between the engine and propeller system, otherwise its essentially the same, there also is only one RPM gauge. If you understand the constant speed propeller principle in connection with piston engines, this kind if turboprop engine should …

[Advanced GUIDE] Propeller Basics

Definitions First it is important to understand the following definitions when talking about propellers: Blade / Pitch angle - This is the angle between the propeller plane of rotation and the chord line of the blade. On a fixed pitch propeller this angle is fixed, on a Constant Speed Propeller (CSP), this angle is adjusted to balance engine power and propeller power absorbed, controlling the propeller RPM. Washout or twist - The blade angle on a propeller blade is not the same along the w…