Re: spins from coordinated flight

Stefan,

I am currently chanting the "ball centered = no spin" mantra.  However
I am very sympathetic to your explaination that its a difference in AoA.
In the end, that may be the purest way to explain the spin.

If this thread sustains I'll listen in and see what I can sift out.

Todd

"Stefan" <stefan@[EMAIL PROTECTED]
> wrote in message news:4bb62$4773ba89

> While I agree that this is a correct and simple recipe and therefore
quite 
> useful in practice, I don't agree that it helps to *understand* the 
> situation, because *reason* for the spin is not the yaw rate. The reason

> for the spin is an asymmetric angle of attack, i.e. one wing is more 
> stalled than the other. Of course this situation can only occur if there

> is some yaw, which leads us to the recipe given above.
>
> Recipe: As there is always some yaw in a coordinated turn (otherwise it 
> wouldn't be coordinated), you can perfectly enter a spin from a 
> coordinated turn. Aerodynamic reason: The inner wing has a higher angle
of 
> attack than the outer, so it stalls first or, if both wings stall, it is

> more stalled. Asymmetric stall condition -> spin.