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Airscrew comparison.
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<blockquote data-quote="brushpilot" data-source="post: 97461" data-attributes="member: 18575"><p>I forgot to mention in my review that when you compare the two props in profile you can noticeably see the prop pitch is greater on the M.A.S. with a greater surface area, overall. My partially informed guess is that the deeper 'bite' of the M.A.S. props reduces the rpm and hence the noise. Most rotor noise is caused by tip vortices and represents lost energy. I've seen upswept tips on competing low noise rotors and that could be their route to greater efficiency. I've worked with helicopters for many years and you notice stuff after a while. If you look at the blades of a UH-60 Blackhawk you'll see both the main and tail rotors are swept a bit at the tips and I find they make less noise than a helo that has half the lift capability.</p></blockquote><p></p>
[QUOTE="brushpilot, post: 97461, member: 18575"] I forgot to mention in my review that when you compare the two props in profile you can noticeably see the prop pitch is greater on the M.A.S. with a greater surface area, overall. My partially informed guess is that the deeper 'bite' of the M.A.S. props reduces the rpm and hence the noise. Most rotor noise is caused by tip vortices and represents lost energy. I've seen upswept tips on competing low noise rotors and that could be their route to greater efficiency. I've worked with helicopters for many years and you notice stuff after a while. If you look at the blades of a UH-60 Blackhawk you'll see both the main and tail rotors are swept a bit at the tips and I find they make less noise than a helo that has half the lift capability. [/QUOTE]
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Airscrew comparison.