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The Corvo Precision Payload Delivery System (PPDS) is a small aerial drone originally intended for logistics, weighs 2.4 kg (5.3 lb) empty, and deliveries payloads of up to 3 kilograms (6.6 lb). [1] The airframe is made of waxed foamcore (foamboard) and the drone is supplied as a self-assembly flatpack, complete with a tablet-PC control centre ...
A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating comparable thrust to traditional propellers. In practice, toroidal propellers reduce noise pollution in both aviation and maritime ...
The Hubsan X4 is a series of very small, lightweight, remotely controlled quadcopters (sometimes considered unmanned aerial vehicles or "drones") which utilize four propellers (hence the "X4" designation) powered by a single lithium-polymer battery. Since the marketing of the first model, several upgrades and improvements have taken place, each ...
The CH-802 has a cylindrical fuselage with propulsion being provided by a two-blade propeller driven by a tractor brushless electric motor atop the fuselage. [37] [38] The CH-803 is mainly intended for reconnaissance and surveillance missions. [35] The CH-802 program began in 2007 and was completed in 2008. Specifications: [39] [40] Wingspan (m): 3
1871 Planophore A Farman MF.11, showing the classic Farman configuration with engine between tail booms Buhl A-1 Autogyro, the first pusher autogyro The post-WWII Convair B-36 was unusual in its size, era, number of engines, and combining both propeller and jet propulsion, with six radial piston and four jet engines Typical of many UAVs, the General Atomics MQ-9 Reaper has a propeller at the ...
Other terms include ducted propeller or shrouded propeller. [1] When used in vertical takeoff and landing applications it is also known as a shrouded rotor. [2] Ducted fans are used for propulsion or direct lift in many types of vehicle including airplanes, airships, hovercraft, and powered lift VTOL aircraft. The high-bypass turbofan engines ...
A 6-bladed Hamilton Standard 568F propeller on an ATR 72 short-haul airliner. Lowry [27] quotes a propeller efficiency of about 73.5% at cruise for a Cessna 172.This is derived from his "Bootstrap approach" for analyzing the performance of light general aviation aircraft using fixed pitch or constant speed propellers.
A cyclorotor, cycloidal rotor, cycloidal propeller or cyclogiro, is a fluid propulsion device that converts shaft power into the acceleration of a fluid using a rotating axis perpendicular to the direction of fluid motion. It uses several blades with a spanwise axis parallel to the axis of rotation and perpendicular to the direction of fluid ...