English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Attempts to use Electrohydrodynamic (EHD) flow for propulsion have been madesince the last century [1]. Limited success has been registered particularlydue to the inhomogeneous generation of the thrust, and also the very lightweight and frail nature of the devices versus the power supply weight neededhover the craft [2]. However, EHD propulsion can offer a greater thrust topower ratio than any of the current propulsion technologies [3]. Rotary EHDdevices have been employed as demo units for a long time [4,5], but it wasunknown if they could produce enough thrust and vertical lift to lead to deviceliftoff. We designed EHD propellers which spin and eventually lift off and flyindependently for a short while. The propeller is balanced on and poweredthrough a high voltage pin/shaft while an intense electric field is created bythe presence of a surrounding ground electrode [6]. Multiple propellerelectrode designs and ground counter electrodes are able to support propellerrotation and liftoff. Propellers up to 27.8 g and 25.5 cm in diameter werestudied with a liftoff voltage range of negative 9.5 kV to 60 kV and rotationalspeeds up to 80 rot/s. It appears that these are the first EHD devices toliftoff and fly on their own without carrying a power supply [7]. Thisvalidates a rotary-based system as a new principle for propulsion withpotentially improved stability and control characteristics versus the currentEHD devices. Design optimization and scaling seem possible and EHD drone designfeasible. Other applications may include EHD motors, fans, or sensors.

Electrohydrodynamic self-boosted propeller for in-atmosphere propulsion