Hi Guys
On some aircraft the stallstrip is specifically designed to cause turbulence over the tail at high alpha and 'warn' the pilot of impending doom. Mooneys use this I know.
For the rest of the story, and to cut it short, if you've got a wing which is going to stall out near the wingtips and over the ailerons, you'll get wing drop with no roll control which is not good.
Washout can help to prevent this (lower angle of attack at Tip than root) but a cheaper solution is to fit stallstrips which induce stall in the wing at the root section. This way you get nose drop but retain roll control.
Going back to the original post, do stallstrips warn of impending stall? Well yes I suppose they do by giving you early stall indications, as opposed to advanced uncontrollable stall without any warning.
Just my 2p worth.
