Knuckle rapper

[Longiron]

Quote

To prevent the pilot from exceeding a 17° angle of attack, the control column incorporated a "knuckle rapper" which would strike the pilot's knuckles as the limit was approached

In soviet Russia... plane is hit you!

[Vatikus]

lol, and cows are blue

[TLTeo]

Stick shakers are for weaklings

[Dragon1-1]

Well, it's probably mechanically simpler than a stick shaker. It's the same idea, but cheaper to implement.  Would be interesting if we could get this to work on a DIY MiG-23 stick.

[Mars Exulte]

In theory should be pretty simple, though require some of that DCS Bios stuff. If Simshaker can make AoA vibrate a motor, you can, too. Extra points if you make it hit hard enough to bruise

[izzyssm]

Any pictures or videos of it? I can't imagine what this would look like. 

[OverStratos]

This is not present on any MiG-23 I know, being MF, ML/MLA or MLD
maybe on older variants
 

Edited March 20, 2021 by OverStratos

[G.J.S]

If the aircraft is close or exceeding the AoA limit, then the stick is likely full back.

If there is something that ‘raps the knuckles’ of the pilot, then whatever does this has to extend out quite some way in order to connect with the pilots pinkies.

Pretty sure this is only metaphorical!

 

You really wouldn’t want anything impinging on the movement of the stick.

[portman]

The american Red Eagle pilots (Constant Peg program) had this system in their MiG-23MS and called it "knuckle rapper". It (gently) rapped their knuckles when they exceeded the maximum angle of attack (depending on the wing sweep angle). In later MiG-23 variants, it was replaced by a "stick stopping device" (SOUA). You can see it on the picture, it's the foam rubber coated thingy on the braking lever (it moves independently from the lever though).