In the context of development high-speed compound helicopters, main rotor may not be an efficient propulsive device at high speeds and adding a propeller is means to enable higher speed. On such configuration, low speed, propellers are in strong interactions with wake which affects their performance aircraft maneuverability. The present work numerically investigates aerodynamics rotor/propeller...

Microrobots have the potential to dramatically change many aspects of medicine by navigating through bodily fluids to perform targeted The International Journal of Robotics Research Vol. 28, No. 11–12, November/December 2009, pp. 1434–1447 DOI: 10.1177/0278364909341658 c The Author(s), 2009. Reprints and permissions: http://www.sagepub.co.uk/journalsPermissions.nav Figures 1, 3, 5–10 appear in ...

Self-propelled bacteria can be integrated into synthetic micromachines and act as biological propellers. So far, proposed designs suffer from low reproducibility, large noise levels or lack of tunability. Here we demonstrate that fast, reliable and tunable bio-hybrid micromotors can be obtained by the self-assembly of synthetic structures with genetically engineered biological propellers. The s...

This paper presents a theoretical study on the ability of multi-rotor aerial vehicles (MRAVs) with tiltable propellers to achieve and sustain static hovering at different orientations. To analyze MRAVs hovering, novel linear map between platform's control inputs applied forces moments is introduced. The relation introduced hover orientations developed. Correspondingly, conditions for realize ar...

2 Introduction 3 Design of the Voith Schneider Propeller 5 The hydrodynamic principle of thrust generation 9 Hydrodynamic characteristics of Voith Schneider Propellers 12 Hydrodynamic calculation methods for Voith Schneider Propellers 13 Ships with Voith Schneider Propellers 16 Ship Assistance with Voith Water Tractors 18 Voith Water Tractors as escort ships 19 Voith Turbo Fin (VTF) 21 Mine Cou...

Repetition is a widespread feature of natural proteins. The repeated units vary considerably in size, from single residues to entire domains. Repeats that fold into single domains yield a hierarchy of structural complexity, from fibrous domains made by the repetition of patterns only a few amino acids long (collagen, coiled coils, b-helices), to solenoid domains formed by the repetition of simp...

Unmanned Aerial Vehicles (UAVs) have become very affordable and small in recent years, and are increasingly used in a wide range of monitoring and surveillance applications. A major problem when operating with swarm of UAVs is the risk of mid-air collisions. Sensor technology to detect other aircrafts in order to prevent collisions currently receives a lot of attention in the research community...