Very quiet.
Hi Rich,
The reason that I can takeoff down wind is to due to the blade design. However, if you have the SG6042 blade profile you can also take off without any wind. I do it all the time with that profile. I learned this from Hal deBolt. Put a prop spinner on the top of the rotor and use a variable speed electric drill and pre spin the rotor. I would not set the rotor head incidence more than 5 or 6 degrees as when those blades comes up to speed it could flip you over back-wards. I start spinning slow and then increase up to the maximum speed of the drill and give full throttle. It's best for the first few times to have someone else pre-spin the blades and then you can concentrate on flying. I suspect you will be off the ground in less than 20 feet. Good luck.
Phil