Unmanned aerial vehicles are being utilized by numerous groups around the world for various missions. Most of the smaller vehicles that have been developed use commercially-offthe-shelf parts, and little information about the performance characteristics of the propulsion systems is available in the archival literature. In light of this, the aim of the present research was to determine the perfo...

4 Other perturbations and developments 16 4.1 3rd order responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2 Spin and magnetic effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3 Elastic constants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.4 Electron-Phonon coupling . . . . . . . . . . . . . . . . . . . . . . . . . ....

<p>The aim of the present research work is to investigate hydrodynamic characteristics (pressure distribution, rotational speed, thrust and torque) conventional B-series composite propeller blade. The open water efficiency for scaled model blade computed using computational fluid dynamics (CFD) fluent simulation tool. obtained numerical results show that will operate at optimum given spee...

An experimental study was performed to design and analyze a "pusher" propeller for use by a small, expendable, autonomous unmanned aerial vehicle (UAV) whose mission was to descend from 30,000 feet to sea level at an approximately constant descent rate over a 3-hour mission duration. The entire propeller design process, from airfoil selection to final part generation in the computer-aided draft...

This paper proposes a nonlinear dynamics model for a marine propeller able to reproduce the propeller thrust over the full four-quadrant range of propeller shaft speed and vessel speed. A two-state model has been identi…ed from experimental data. The model includes a state equation for the propeller shaft speed and one that describes the dynamics of the axial ‡ow velocity. The model reproduces ...

This paper discusses a study of the effects of pylon trailing edge blowing on pusher propeller performance and noise emissions. Experimental investigations were performed in a low speed open jet wind tunnel, using a powered propeller model and a generic pylon model. A novel pylon blowing system was integrated in the aft part of the pylon to provide a uniform outflow. The numerical analysis was ...

Fluid-structure interaction between an ice sheet on the water surface and a podded R-Class propeller was examined and analyzed in terms of numerical simulation using a newly enhanced unsteady timedomain, multiple body panel method model. The numerical model was validated and verified and also checked against various previous in-house experimental measurements. The simulation was performed in a ...

Positioning systems include different control functions for automatic positioning and guidance of marine vessels by means of proper action of the thruster and propeller devices. These may be controllable pitch propeller (CPP) with fixed speed, controllable speed with fixed pitch propeller (FPP), or controllable pitch and speed in combination. The positioning controller computes commanded forces...

A new design of a propulsion device is a Collective and Cyclic Pitch Propeller, CCPP. The principle o f the CCPP is similar to a helicopter main rotor. As such, the propeller operates as a combination between a propulsion device and a directional manipulator. It can generate side thrust to provide direct ional control, in addition to axial thrust variation, which can be generated on a normal co...