Stealth Copter Rotor Blades



Normally, the entire length of the rotor blade interacts with the vortex of the preceding blade. With the Blue Edge rotors, the double-swept tips of the rotor blade reduce the length of the blade-vortex interaction, and it does it at the tip where the blades are moving the fastest relative to the air. The result is a decrease in the sound produced due of the wake interaction at the tip.

This also greatly reduces advancing blade tip drag.

__________________
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!

In the old Big Oil days I rode in Helicopters a lot. You can cover a lot of remote area ground in a day but you can't hear yourself think inside of one, at least not in the ones we had.

This could be a major step forward in the use of these machines.

Plus it is nice to see an advance in science that is purely mechanical.

That WHOP WHOP WHOP sound made by the two-blade Hueys is a thing of the past now...

__________________
1984 300TD

maybe this is the blade from the "black helicopters" in conspiracy theory

adds an extra failure mode on an already scary part of a helicopter

in fuel pumps they use varying blade distances to remove the pulse noise. I am not sure how that would work with air but I experimented with it a little at GE when I was there and it had potential to create some pretty quite fans. the blade pass frequencies are much lower in frequency and magnitude because they cannot couple

__________________

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)