Delro Raven Variable Pitch Prop ''Dr. Low'' 

Papa Jack *_That's why Markus is called ''Dr. Low''._* _Thank you for your kind comments and compliments. Much appreciated !_

ChrisB257 _The power plant is made by Markus. This is the 4th year he is flying this kind of variable pitch system._ *_Flying low gave him the nickname ''Dr. Low'' !_* Thank you for watching and commenting, Chris. Always much appreciated ! ! !

Bill Swingle _Thank you for your kind comments, Bill. Much appreciated._

Josip Vrandecic _Thank you for your kind comments, Josip. Much appreciated._

Léo _Thank you for the compliments, Léo._

RCWyoming *thanks ! ! !*

SomeGuyInSandy *_T H A N K S !_*

*_thanks !_* 😉👍

DavidePascale79 _No. Not for Markus._ 😎 Thank you for your great comments, Davide.

John Dueck _The props are normal helicopter blades, which have been shortened._

Mike Anderson _Thank you for watching and commenting!_

Calypso AirFPV *thx*

osman fuenmayor *_thank you!_*

OK ... The video is shit. Did you recognise that the sun was in your face?

Bruchpilot_112 *_that's why Markus is called ''Dr. Low'' !_*

*_tAnKs ! ! !_*

Giantman2001 _Thank you for watching and commenting._

Bunnyshooter 223 you obviously have no experience with rc to make a statement like that.

John Ratko *_almost ... LooooL_* 😎

Maximilian Eder _I don't care about. There are some ''friends'' out there, giving a dislike at the very first minutes after the video has been updated._ 😎