Charles22

Does an oxygen mask (like an MBU-5/P) provide any kind of protection from noise to the microphone? I fly a noisy biplane and I already have a military helmet. I was thinking that using an oxygen mask I could improve the quality of my radio transmissions. Of course the free end of the mask hose would not be connected to an oxygen system, but it would be secured at the back of the cockpit where the noise level is somewhat lower. Another question: does the oxygen mask seal perfectly on the face of the pilot or in airplane with an oxygen system, some of the oxygen seeps out of the mask? Thanks