Propeller crashback is an off-design operating condition where a propeller rotates in the reverse direction. Experiments (Bridges 2004, Tech Rep. MSSU-ASE-04-1, Department of Aerospace Engineering, Mississippi State University) have shown that the presence of an upstream hull significantly increases the side force on a propeller in crashback below an advance ratio of J = −0.7. Large-eddy simula...

Abstract Given the rising importance of unmanned aerial vehicles (UAVs), this article addresses urgent scientific problem determining aerodynamic characteristics a UAV while laying out propellers for wings. We discuss methodology experimental wind-tunnel studies aircraft configurations with propellers. It is shown that characteristic feature configuration small-elongation wing absence elements ...

One challenge for the design and analysis of hybrid electric aircraft configurations is an increased demand in rejection excess waste heat. A wing surface heat exchanger concept, which explored as part IMOTHEP project, foresees transferring from propulsive electrical components to aircraft. Here, mainly dissipated transported by forced convection. The present study focuses on impact via wing’s ...

Ship operators are calling more often for reduced fuel consumption and economic ship operation also in offdesign. The versatile operation profile of ship types such as RoRo-vessels are then a challenge for the design of the propeller and for the propulsion concept. This paper presents aspects on the propeller design and propulsion concept of a ship as well as design methods for the propeller. L...

For the sizing of an electric motor, diameter and length installation space are important parameters that significantly influence limit characteristics motor. From aerodynamic point view, it is not technically advantageous to choose a propeller hub larger than mechanically necessary. The defines ans thus outer for motor driving propeller. research question arises this: Is there optimum how limi...

In considering aircraft design, it is very important to effectively size the tail configuration for stability and control. Multidisciplinary design optimization (MDO) focuses on use of numerical in systems with multiple subsystems or disciplines consideration. However, MDO uses deterministic calculations, does not consider uncertainties that arise from employed analyses, including errors due li...

Introduction Diffusion-weighted MRI (DWI) provides a non-invasive method for in vivo evaluation of tissue water mobility. Most DWI studies employ single-shot DWEPI techniques which can suffer severe artifacts and image distortion in abdominal imaging applications. Multi-shot TSE-based DW-PROPELLER [1] may overcome these limitations. DW-PROPELLER for brain [2] and abdominal [3] imaging has demon...

This paper presents the modeling of a four rotor vertical take-off and landing (VTOL) unmanned air vehicle known as the quad rotor aircraft. The paper presents a new model design method for the flight control of an autonomous quad rotor. The paper describes the controller architecture for the quad rotor as well. The dynamic model of the quad-rotor, which is an under actuated aircraft with fixed...