Des hélices trop Bizarres (hélices toroïdales)

The Dalprop Donut 5145 propellers are very strange; they're toroidal propellers. They should be quieter and more efficient. And yes, they're quieter, efficient... I don't know, but on the other hand, they're very fragile. For freestyle FPV drones, they're not a good prop at all. Where to buy drone components? Affiliate link to a shop in France (DFR), specializing in FPV https://www.drone-fpv-racer.com/?aff=60 FPV Podcast: https://open.spotify.com/episode/0ZdA... Components of my Freestyle Drone: FlexOne V3: https://www.lacameraembarquee.fr/airf... F40: https://www.drone-fpv-racer.com/moteu... Motors (I use the XN. HL 1800KV €92): https://www.drone-fpv-racer.com/entre... Stack (FC+ESC): https://www.drone-fpv-racer.com/combo... RX (TBS €29.90): https://www.drone-fpv-racer.com/tbs-c... VTX: https://www.drone-fpv-racer.com/dji-o... Antenna (€5.90): https://www.drone-fpv-racer.com/anten... Capacitors (1000uF 35v 3€): https://www.drone-fpv-racer.com/conde... Screws (15€): https://www.drone-fpv-racer.com/vis-a... Vista screws (7€): https://www.drone-fpv-racer.com/pirat... Radio (TangoII €189.90): https://www.drone-fpv-racer.com/radio... Mask: https://www.drone-fpv-racer.com/dji-g... Charger (€126.90): https://www.drone-fpv-racer.com/charg... Propellers (HQ V2s €3.40): https://www.drone-fpv-racer.com/hq-fr... J40: https://www.drone-fpv-racer.com/hq-ju... 1550mah or Ovonics 1600 130c batteries: https://www.drone-fpv-racer.com/batte... Soldering iron: https://www.drone-fpv-racer.com/fer-a... Tin (TBS €4): https://www.drone-fpv-racer.com/etain... Instagram: Flex:   / flexfpv