[2] Development began in 2013 after Curti formed a partnership with Czech engine maker PBS Velká Bíteš (PBSVB) and German company Junkers Profly.

[3] The rotorcraft has been developed under the DISRUPT project for reliable and secure ultralight helicopters; it was partially funded by the European Commission to support small and medium enterprises, in addition to regional financing.

[1][3] In April 2018, the Zefhir was launched at the AERO Friedrichshafen tradeshow in Germany, seeking for German ultralight approval and countries recognizing this certification.

[1][3] PBSVB manufactures the Zefhir’s turboshaft, derated from 241 to 141 shp (180 to 105 kW) maximum continuously, and optimally controlled by FADEC.

[4] The engine drives a two-bladed main rotor with a profile maximising efficiency while lowering noise pollution.