Snaps/Spins

[Bill Glaze]

Apropos to this rate business--years ago, the military tests didn't even
consider a spin developed before five (5) full rotations.  After that, it
was considered a fully developed spin.  (If memory serves correctly.)

Bill Glaze

Ron Van Putte wrote:

> You can analyze the skin off maneuvers like snaps and spins and we've
> been doing a lot of that.  However, one thing I haven't heard in the
> latest series of discussions is that, like other maneuvers, the airplane
> characteristics do not instantly develop into the spin/snap rates we see
> in mid-maneuver.  Newton has something to say about that.  Forces and
> moments produce linear and angular accelerations, which are opposed
> countering forces and moments as the rates build, until the steady state
> (constant rate) condition is achieved.  It takes time to do that.
> Similarly, it takes time to stop a snap/spin.  So, what you should see
> in snaps/spins is an increase roll/yaw rate, a constant roll/yaw rate
> and a decrease in yaw/roll rate.   What I'm afraid that some judges are
> seeing the acceleration and deceleration in roll/yaw rates at the
> beginning and end of a snap/spin as downgradable, when the pilot can't
> do anything about  it - it's physics.
>
> Ron Van Putte
>
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