I've been trying to stay out of this conversation, I do not own any MAS props. My preference has been APC for a variety of reasons and have held true over the last 3 years. I have done a little research over the last few years to gain some understanding for the subject. Not an expert by any means, just an informed opinion.
The following will answer a few questions. Not a white paper study, however there are plenty on the net related to the subject...again search is your friend.
From Hartzell Propeller Co., emphasis mine...
Sure, not a quad prop, but the concept is the same. I'd venture to bet the tri-blade has an equal amount of airfoil surface as the larger twin-blade. Also a shorter prop is going to be that much stiffer, again less tip flex to generate the buzzing noise.
As noted in P2P's data, RPM did increase and as expected for the thrust needed to hover. If you can live with shorter flight time you will reduce perceived vibrations, as the frequency is higher. @Ralph E. Johnson video is a great example with less vibes...
You guys wanting more thrust at higher alt are going to be disappointed with the 945 tri-blade. Find a 1035~ tri-blade and you'll have what you want. That is what I'm holding out for.... (@Saijin_Naib )
Finally a tri-blade is typically better/easier balanced than a twin-blade. There is physics involved, plenty of white papers on that subject as well.
I wish everyone the best of luck using whatever prop, for what ever reason you choose. It's good to have choices. Peace!
The following will answer a few questions. Not a white paper study, however there are plenty on the net related to the subject...again search is your friend.
From Hartzell Propeller Co., emphasis mine...
Will a 3-blade prop make my airplane quieter inside?
Yes, in most installations increasing the number of blades helps to reduce noise. Cockpit noise comes from a variety of sources; engine, exhaust, air flow around the fuselage, and the propeller. Vibrations are also perceived as noise in the cockpit. In a single-engine airplane, the propeller blade wake will beat on the windshield producing noise. A 2-blade propeller produces two pressure pulses per revolution, where a 3-blade propeller will produce three smaller pulses per revolution (for the same amount of total thrust) which is inherently smoother and therefore quieter. The 3-blade propeller will generally have a smaller diameter than the 2-blade propeller that it replaces, which also reduces the tip speed and noise. In a twin-engine aircraft, the reduced diameter of the 3- blade propeller will result in less tip-generated noise and a greater clearance between the blade tip and the fuselage. Both of these characteristics will reduce cabin noise.
Sure, not a quad prop, but the concept is the same. I'd venture to bet the tri-blade has an equal amount of airfoil surface as the larger twin-blade. Also a shorter prop is going to be that much stiffer, again less tip flex to generate the buzzing noise.
As noted in P2P's data, RPM did increase and as expected for the thrust needed to hover. If you can live with shorter flight time you will reduce perceived vibrations, as the frequency is higher. @Ralph E. Johnson video is a great example with less vibes...
You guys wanting more thrust at higher alt are going to be disappointed with the 945 tri-blade. Find a 1035~ tri-blade and you'll have what you want. That is what I'm holding out for.... (@Saijin_Naib )
Finally a tri-blade is typically better/easier balanced than a twin-blade. There is physics involved, plenty of white papers on that subject as well.
I wish everyone the best of luck using whatever prop, for what ever reason you choose. It's good to have choices. Peace!