My comment is to item #2: Hover-Propeller Full Design Cycle - Performance and Acoustic
My full respect to the expertise and efforts described in the report. Just want to hint at a new potential approach to reducing propeller noise. It is through application of variable twist blades. Variable blade twist provides a quasy constant level (high level!) of propeller efficiency for a changing axial speed. High efficiency, theoretically, ensures low level of wasted energy, which may manifest in silent operation.
Thanks Sevincel
My comment is to item #2: Hover-Propeller Full Design Cycle - Performance and Acoustic
My full respect to the expertise and efforts described in the report. Just want to hint at a new potential approach to reducing propeller noise. It is through application of variable twist blades. Variable blade twist provides a quasy constant level (high level!) of propeller efficiency for a changing axial speed. High efficiency, theoretically, ensures low level of wasted energy, which may manifest in silent operation.
Dear Laszlo,
Thank you for your insightful comment.
Would you be able to point me towards research or paper that shows this concept?
Very much appreciated,
Pamir
Dear Pamir,
Thank you for the question! Variable blade twist of propellers is my favorite topic (it has been for some years).
It is based on an invention, which has a “patent pending” status in the US. In Hungary (my country) the patent has recently been granted.
All documents and descriptions are available at the www.stallfreepropellers.com website.
It is my honor if you can check it out! With best regards,
Laszlo