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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
One example of a reconnaissance UAS powered by two turboprops is the centerline thrust IAI Eitan (“Steadfast”) powered by two PT6-As developing 900 kW (1200 shp) each. Figure 11.3 shows another turboprop-powered UAS is the General Atomics Reaper (previously known as the Predator B), powered by the Honeywell TPE331-10 producing 671 kW (900 shp). Examples of turboshaft powerplants installed on UASs include the Honeywell T53-17A-1 installed on the Kaman (K-1200) K-MAX. This powerplant is capable of producing 1,341 kW (1,800 shp) of power, but is flat-rated to 1,118 kW (1,500 shp) for takeoff and 1,006 kW (1,350 shp) in flight. A powerplant may be flat-rated for other reasons (e.g., to provide sea-level performance to a certain pressure altitude), but in this case, it is done to increase powerplant and transmission life. Another example of a UAS turboshaft installation is that of the Pratt & Whitney Canada PW207D turboshaft, which develops 478 kW (641 shp) and powers the Bell Eagle Eye tiltrotor.
UAS Airframe and Powerplant Design
Published in Douglas M. Marshall, R. Kurt Barnhart, Eric Shappee, Michael Most, Introduction to Unmanned Aircraft Systems, 2016
Turboprops and turboshaft gas turbines are so similar as to be essentially the same. The free or power turbines of both designs drive a gear reduction unit to reduce the output rpm and increase the torque delivered to the propulsor airfoils. In fact, aircraft gas turbines (e.g., P&WC PT6, Lycoming T-53, and the Rolls Royce 250) have often been installed on both helicopters and fixed wings, and the primary factor determining whether these are considered turboprops or turboshafts is the type of aircraft on which they are installed, that is, a turboshaft if installed on a rotary-wing aircraft and a turboprop if installed on a fixed-wing aircraft. One example of a reconnaissance UAS powered by two turboprops is the centerline thrust IAI Eitan (“Steadfast”) powered by two PT6-A’s developing 900 kW (1200 shp) each. Another turboprop-powered UAS is the General Atomics Reaper (previously known as the Predator B), powered by the Honeywell TPE-33-10 producing 671 kW (900 shp). Examples of turboshaft powerplants installed on UASs include the Honeywell T53-17A-1 installed on the Kaman (K-1200) K-MAX. This powerplant is capable of producing 1341 kW (1800 shp) of power, but is flat-rated to 1118 kW (1500 shp) for takeoff and 1006 kW (1350 shp) in flight. A powerplant may be flat-rated for other reasons (e.g., to provide sea level performance to a certain pressure altitude), but in this case it is done to increase powerplant and transmission life. Another example of a UAS turboshaft installation is that of the Pratt & Whitney Canada PW207D turboshaft, which develops 478 kW (641 shp) and powers the Bell Eagle Eye tiltrotor.
Atmosphere
Published in Mohammad H. Sadraey, Aircraft Performance, 2017
1.7 An aircraft is flying at an altitude at which its temperature and pressure are 255 K and 4.72 × 104 Pa. Calculate Pressure altitudeTemperature altitudeDensity altitude
Research on vision navigation and position system of agricultural unmanned aerial vehicle
Published in International Journal of Computer Integrated Manufacturing, 2020
Weilun Zhao, Tongyu Xu, Yan Wang, Wen Du, Aibing Shen
UAV flight control systems are integrated high-performance systems that need to achieve autonomous navigation, automatic flight control and task management. They require a large amount of complex data processing and mathematical operations. The GPS position, heading signal, altitude airspeed sensor pressure altitude, speed signal, radio altimeter height as a benchmark, by the high spectrum of plant detection, according to the physiological parameters of target positioning and calculate flight control loop given attitude and engine throttle position command, the ideas need large amounts of flight data to be verified, it will be the major task in the future.