CycloTech: Noise testing results are in for its CycloRotor eVTOL technology

Impressively low levels of noise emissions

The test was performed with CycloRotor CR-42 being mounted vertically on a mobile frame and placed far away from any reflective surface. To characterize the noise generation and propagation of the CycloRotor, measurements were made using eight microphones positioned in five different configurations during periods of no air traffic and wind speeds below 2.5 m/s.

The test campaign's most important finding is that the CycloRotor produces sound pressure levels of 59 dBA at a distance of 100 meters, which is comparable to the volume of a regular two-person conversation. 

“This is a promising result and CycloTech will continue to investigate and optimize the aeroacoustic signature of the CycloRotor," said Pedro Carrasco Laraña, aeroacoustics engineer at CycloTech.

The novel technology offers multiple advantages

The CycloRotor system offers a propulsion technology that makes use of a series of spinning barrels instead of the conventional rotor blade or ducted fan to provide thrust for eVTOL aircraft and drones. The concept uses 360-degree thrust vector systems based on the same physical theory as the Voith-Schneider-Propeller, which has been successfully used for decades in the maritime sector for highly agile and stable ships.

Such a design allows it to be compact and can instantly and directly regulate the strength and direction of thrust, enabling accurate maneuverability and a smooth transition from hover to flight, even in more severe weather. "Key feature of CycloRotors is the ability to instantaneously direct the thrust vector in a full circle of 360 degrees, whereas all other propulsion systems pull or push basically into one direction."

According to the team, the patented technology can enable aircraft manufacturers to build the next generation of aircraft for the 21st century.

The company believes such a CycloRotor technology can enable the industry to "develop the next generation of aircraft, especially for UAV, UAM, and individual air mobility (IAM) applications."