Radio Controlled “3D Aerobatic Airplanes” as Basis for Fixed-Wing UAVs with VTOL Capability

Poh, Chung-How; Poh, Chung-Kiak

doi:10.4236/ojapps.2014.412050

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…Modern aerobatic fixed-wing aircraft, whether full-size or in the form of a radio controlled (RC) model, are designed to operate even under fully stalled conditions [9] [10] [11] [12] [13]. These fixed-wing aircraft can fly in trim at high angles of attack of 45˚ or more with air speed below the stall speed (V s )-a maneuver known as the "harrier" and it is one of the popular "3D aerobatic maneuvers" within the RC flight community [13] [14]. Hallmarks of unlimited aerobatic airplanes are their relatively large control surfaces and a thrust-to-weight ratio that exceeds unity [9] [10].…”

Section: Aerobatic Airplanes and 3d Maneuversmentioning

confidence: 99%

“…Hallmarks of unlimited aerobatic airplanes are their relatively large control surfaces and a thrust-to-weight ratio that exceeds unity [9] [10]. Large control surfaces with large deflections in the presence of strong propeller wash give adequate authority even when the airspeed of the aircraft is much lower than the stall speed V s [14].…”

Section: Aerobatic Airplanes and 3d Maneuversmentioning

confidence: 99%

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Retarded Harrier Maneuver as a New and Efficient Approach for Fixed-Wing Aircraft to Achieve S/VTOL

Poh¹,

Poh²

2021

AAST

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Modern day VTOL fixed-wing aircraft based on quadplane design is relatively simple and reliable due to lack of complex mechanical components compared to tilt-wings or tilt-rotors in the pre-80's era. Radio-controlled aerobatic airplanes have thrust-to-weight ratio of greater than unity and are capable of performing a range of impressive maneuvers including the so-called harrier maneuver. We hereby present a new maneuver known as the retarded harrier that is applicable to un/manned fixed-wing aircraft for achieving VTOL flight with a better forward flight performance than a quadplane in terms of weight, speed and esthetics. An airplane with tandem roto-stabilizers is also presented as an efficient airframe to achieve VTOL via retarded harrier maneuver, and detailed analysis is given for hovering at 45˚ and 60˚ and comparison is made against the widely adopted quadplane. This work also includes experimental demonstration of retarded harrier maneuver using a small remotely pilot airplane of wingspan 650 mm.

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Section: Aerobatic Airplanes and 3d Maneuversmentioning

confidence: 99%

Section: Aerobatic Airplanes and 3d Maneuversmentioning

confidence: 99%

Retarded Harrier Maneuver as a New and Efficient Approach for Fixed-Wing Aircraft to Achieve S/VTOL

Poh¹,

Poh²

2021

AAST

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“…Unmanned Aerial Vehicles (UAVs), popularly known as drones, are autonomously or remotely operated aircrafts, which can fly without on-board human pilot, while being operated from the ground [1]. Currently, drones are for multiple purposes such as for entertainment (as a toy [2]), for civilian applications (for example, monitoring soil erosion [3] and wildlife [4], remote sensing [5], surveying and photogrammetry [6], smart agriculture [7], disaster surveying and management [8], forestry [9], energy harvesting [10], and housing renovation [11]), scientific applications [12], and military applications (surveillance and reconnaissance [13] and attacking the enemy [14,15]).…”

Section: Introductionmentioning

confidence: 99%

Design of Fully Automatic Drone Parachute System with Temperature Compensation Mechanism for Civilian and Military Applications

Almadani

Svirskis

Narvydas

et al. 2018

Journal of Advanced Transportation

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Application of Unmanned Aerial Vehicles (a.k.a. drones) is becoming more popular and their safety is becoming a serious concern. Due to high cost of top-end drones and requirements for secure landing, development of reliable drone recovery systems is a hot topic now. In this paper, we describe the development of a parachute system with fall detection based on accelerometer-gyroscope MPU – 6050 and fall detection algorithm based on the Kalman filter to reduce acceleration errors while drone is flying. We developed the compensation algorithm for temperature-related accelerometer errors. The parachute system tests were performed from a small height on a soft surface. Later, the system was tested under real-world conditions. The system functioned effectively, resulting in parachute activation times of less than 0.5s. We also discuss the civilian and military applications of the developed recovery system in harsh (high temperature) environment.

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“…Power requirement of fixed vs. rotary wing UAVs with the same weight, (redrawn fromPoh and Poh, 2014).…”

mentioning

confidence: 99%

Towards accurate and practical drone-based wind measurements with an ultrasonic anemometer

Thielicke¹,

Hübert²,

Müller³

2020

Preprint

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Abstract. Wind data collection in the atmospheric boundary layer benefits from short term wind speed measurements using unmanned aerial vehicles. Fixed and rotary wing devices with diverse anemometer technology have been used in the past to provide such data, but the accuracy still has the potential to be increased. We developed a light weight drone (weight including sensor 45 min) for carrying an industry standard precision sonic anemometer. Accuracy tests have been performed with the isolated anemometer at high tilt angles in a calibration wind tunnel, with the drone flying in a large wind tunnel, and with the full system flying at different heights next to a bistatic lidar reference. The propeller-induced flow deflects the air to some extent, but this effect is compensated effectively. Our data fusion shows no signs of crosstalk between ground speed and wind speed. When compared with the bistatic lidar in very turbulent conditions, with 10 seconds averaging interval and with the UAV constantly circling around the measurement volume of the lidar reference, wind speed measurements have an average absolute bias of 1.9 % (0.073 m s−1), wind elevation average absolute bias is 0.5°, and wind azimuth average absolute bias is 1.5°, indicating excellent accuracy under challenging and dynamic conditions. The system was finally flown in the wake of a wind turbine, successfully measuring the spatial velocity deficit distribution during forward flight, yielding results that are in very close agreement to lidar measurements and the theoretical distribution. We believe that the results presented in this paper can provide important information for designing flying systems for precise air speed measurements either for short duration at multiple locations (battery powered) or for long duration at a single location (power supplied via cable). UAVs that are able to accurately measure three-dimensional wind might be used as cost effective and flexible addition to measurement masts and lidar scans.

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Radio Controlled “3D Aerobatic Airplanes” as Basis for Fixed-Wing UAVs with VTOL Capability

Cited by 7 publications

References 11 publications

Retarded Harrier Maneuver as a New and Efficient Approach for Fixed-Wing Aircraft to Achieve S/VTOL

Retarded Harrier Maneuver as a New and Efficient Approach for Fixed-Wing Aircraft to Achieve S/VTOL

Design of Fully Automatic Drone Parachute System with Temperature Compensation Mechanism for Civilian and Military Applications

Towards accurate and practical drone-based wind measurements with an ultrasonic anemometer

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