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UAS Propulsion System Design
Published in R. Kurt Barnhart, Douglas M. Marshall, Eric J. Shappee, Introduction to Unmanned Aircraft Systems, 2021
Michael T. Most, Graham Feasey
The propeller is generally considered to be an integral component of a powerplant installation. On a fixed-wing aircraft (rotary-wing aircraft and multirotors were covered in previous sections), the combination of powerplant and propeller creates the propulsor, the unit responsible for generating a propulsive force. With the exception of those examples powered by a turbojet, turboshaft, or fan, all fixed-wing UASs generate a propulsive force by accelerating a mass of air through a propeller disk. All of the preceding UAS powerplants, excluding jet, fan, and turboshaft gas turbines, drive propellers. Thus, a propeller is not an insignificant component of the majority of fixed-wing unmanned aircraft. UA propellers may be of fixed or variable pitch (e.g., ground-adjustable) or of constant speed design. Propellers for UAs are made from a variety of materials: wood, carbon composite, fiberglass, aramid, aluminium, nylon, fiberglass-reinforced nylon, steel, etc. Propeller noise can be reduced by increasing the number of blades for a given thrust rating. Manufacturers include Sensenich, McCauley, Aerovate, and Northwest UAV (NWUAV), among a large number of others. Sensenich has been producing propellers for target drones and reconnaissance UASs since the 1950s (e.g., for Dennyplane aircraft and the Northrop Falconer).
UAS Airframe and Powerplant Design
Published in Douglas M. Marshall, R. Kurt Barnhart, Eric Shappee, Michael Most, Introduction to Unmanned Aircraft Systems, 2016
The propeller is generally considered to be an integral component of a powerplant installation. On a fixed-wing aircraft (rotary-wing aircraft and multi-rotors were covered in previous sections), the combination of powerplant and propeller create the propulsor, the unit responsible for generating a propulsive force. With the exception of those examples powered by a turbojet, turboshaft, or fan, all fixed-wing UASs generate a propulsive force by accelerating a mass of air through a propeller disk. All of the preceding UAS powerplants, excluding jet, fan, and turboshaft gas turbines, drive propellers. Thus, a propeller is not an insignificant component of the majority of fixed-wing unmanned aircraft. UA propellers may be of fixed or variable pitch (e.g., ground-adjustable) or of constant speed design. Propellers for UAs are made from a variety of materials: wood, carbon composite, fiberglass, aramid, aluminum, nylon, fiberglass-reinforced nylon, steel, etc. Manufacturers include Sensenich, McCauley, Aerovate, Northwest UAV (NWUAV), among a large number of others. Sensenich has been producing propellers for target drones and reconnaissance UASs since the 1950s (e.g., for Dennyplane aircraft and the Northrop Falconer).
Optimization procedures for a twin controllable pitch propeller of a ROPAX ship at minimum fuel consumption
Published in Journal of Marine Engineering & Technology, 2023
M. Tadros, M. Ventura, C. Guedes Soares
The ship propulsor, which is the focus of this paper, is an essential part of improving the wakefield, increasing propeller efficiency and reducing fuel consumption, thus reducing cavitation problems and the issues of noise and vibrations to ensure the safety and sustainability of the ship (Carlton 2012). Two types of propellers are commonly used, fixed pitch propeller (FPP) and controllable pitch propeller (CPP).