A massive library of specific helicopter types (Huey, Apache, etc.) for more realistic or "solid" sound design.
You can find extended clips like a 5-minute, 29-second recording of a helicopter landing with cockpit radio on HookSounds . helicopter_sound_effect_flying_5_minutes
If you can't find a single 5-minute file that fits your specific needs, download a high-quality 30-second loop from Storyblocks or Pixabay and duplicate it in any free editor like Audacity to reach your desired length. Helicopter Flight (75 Minutes) - SoundCloud A massive library of specific helicopter types (Huey,