UStik,

You make a good point about the possible blanking of the rudder. Here are some measurements in the form (CG to rudder hingeline, 1/2 wingspan):

Cutlass (33",31")

Compensator (34",31")

Deception (37", 31")

Kwik Fli III (31, 29.5")

So, the tail moment is shorter for the Cutlass and Compensator relative to the wingspan than for the Deception, meaning that the rudder and elevator of the Deception should be in cleaner air which could enhance the recovery. The Kwik Fli III has great exits, yet it seems be the exception to the above hypothesis since the half-span and tail moment are nearly the same. However, it does have large barn-door ailerons which would make them more effective at stopping (or entering) the spin since they concentrate the aileron area nearer the tips. A few measurement of aileron size and type:

Cutlass (1"x20") strip

Compensator (1.25"x23") strip

Deception (1.75"x20") strip, but centered further out than for the Cutlass or Compensator

Kwik Fli III (3.25"X13") barn door style

So, I would expect the KF III and Deception to have more effective ailerons, which agrees with my observations that these two have more predictable exits.

As was pointed out earlier in the thread, the behavior is most likely the result of the interactions of many small design choices.

Jeff