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Well, most of an the angle of attack on a symetric foil is just to present the foil as an asymmetric one to the airflow and hence get a pressure drop in line with Bernoulis theorem.
Of course you do get additional lift from increasing the angle of attack beyond that because of the downward movement of air due to that angle, and it is considerable, when used, but also expensive in terms of drag, and is of course limited by stalling when the boundary layer breaks away. At that stage the drag is huge, and the lift from Bernoulis theorem gone.
This is the state your friend had his rotor in by running the aerofoil backwards. He was using it like a paddle!
Actually, if you focus on the foot, and speed up the speed at which you make the 6, such that you are in the middle of the transition at the bottom of the rotation, I believe you can inhibit this response effectively.
You have to alter your psychological run burst to be really small, just enough to kick off the 6 with the finger and maintain focus on your foot.
But it took about 3 tries, and now I can do it easily enough...
Curious if others found that...
Harald Bluetooth, the famous king who united Denmark.
I always wondered.
Ah, and a little more digging on wikipedia verifies this:
The name "Bluetooth" is an Anglicised version of the Scandinavian Blåtand/Blåtann (Old Norse blátǫnn), the epithet of the tenth-century king Harald Bluetooth who united dissonant Danish tribes into a single kingdom. The implication is that Bluetooth unites communications protocols.
Today I'm starting to believe I'm living a Dilbert cartoon. There is a thing on Working remotely using sensitive documents (fair enough). There is a policy on using certain bit of licened software (fair enough). There is a policy coming in re: the intranet, follow the specs they want a personal email or phone number ok, but in the confidentiality policy which says don't use personal emails, phone numbers.
The greatest thing is I am having work on something that is not covered by the rules!