And a thoroughly nice bloke too
Seconded, I was most surprised to receive the following email from John, most chuffed, especially asking this peon for his thoughts.
Slender delta airflowDear XXXX
Many thanks for your two 'reading' references on the superstall thread.
I had not seen either.
When they were discussing the various types of vortex instability that could cause wing rock at high alpha I was struck by no mention of the possibility of the vortex attachment point sliding up and down the the leading edge a little. Certainly back in 1964 the RAE boffins at Bedford led me to believe this was the cause of the HP115 divergent dutch roll that followed a rudder tap at a suitable alpha.
In 1990 Valery Menitski (CTP on MiG-29) told me that when he flew the first prototype it was rubbish at high alpha until they nailed the vortex attachment points with a pair if VGs at the base of the pitot. This seemed to me to support the idea of the attachment point wandering up and down the LE as a trigger of wing rock.
Wot think you Sire?
Do you have a reference for where you found the docs in your links?
Happy New Year!
Yours
John
[email protected]