Bumping this old thread, can we call this trickle down technology or just marketing?
https://www.ruppams.com/CatalogConte...VLS/HVLSRA.asp
Quote:
Tubercle Advantage
Offering stall angles as high as 22*degrees
Reduces number of fan blades needed versus conventional*airfoils
Noise reduction by eliminating tip*stalling
Lowers vibration and leads to less wear and tear on the blades and drive*train
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