Ok I have three kinds of propellers. Original: The DJI Carbon Fiber Reinforced: The Tri-Carbon Fiber: I did a sound test on each using the DB app on my iPad. Original prop at idle next to mic = 68db Original prop at hover 10 feet away = 73db DJI Carbon Reinforced at idle next to mic = 71db DJI Carbon reinforced at hover 10 feet away = 75db Try-Carbon Fiber at idle next to mic = 70db Try-Carbon Fiber at hover 10 feet away = 74db Sorry, reached 10 photo limit. I also did an ascending test. At idle, pegged the stick counted 5 seconds then read distance. Original 18.6 meters. DJI Carbon Reinforced 17.8 meters. Tri-Carbon Fiber 18.1 meters. Thought you guys might find this interesting.