What would a helicopter look like if it were able to reach the speed of sound? It has to have at least one propeller and be built from a helicopter frame. -
Revolutionary Concepts for Helicopter Noise Reduction: SILENT Program | Semantic Scholar
Jay Asher: Thwip, Thwap, Thwop, or Thwup?
Helicopter noise sources | Download Scientific Diagram
Helicopter Blades Breaking The Sound Barrier | StanW1949 | Blipfoto
The science behind helicopter noise — and how the industry is working to reduce it - Vertical Mag
The science behind helicopter noise — and how the industry is working to reduce it - Vertical Mag
1: Helicopter rotor harmonic noise sources. | Download Scientific Diagram
Can We Really Have Stealth Helicopters When They're So Loud? - YouTube
Quiet, please! | Airbus
Bell's New Design Could Make Helicopters Quieter—and Safer | WIRED
Modeling aerodynamically generated sound of helicopter rotors - ScienceDirect
What causes rotating helicopter blades to make a chirping sound? - Quora
Why do helicopter blades make many “chopping” noises instead of one continuous “whooshing” noise? - Quora
Advanced helicopter rotor blade design | Britannica
Helicopter White Noise | ASMR Sounds | 1 hour - YouTube
What are some ways to make a helicopter's rotor blades less noisy, while still retaining their function and effectiveness? - Quora
What is the cause of helicopter 'chopping' sound? - Quora
What can be done to make helicopters more quiet? - Quora
Best Helicopter Sounds. Top Sounds that Helicopters make. - YouTube
Slowed rotor - Wikipedia
Modeling aerodynamically generated sound of helicopter rotors - ScienceDirect
Helicopters & Vertical Flight – Introduction to Aerospace Flight Vehicles
Advanced helicopter rotor blade design | Britannica
Why do helicopters make a distinct pulsing sound when the blades are rotating at a constant speed? Shouldn't they sound like a large fan? - Quora
