My guess would be that you were not in a Stall/spin but rather had entered a steep sprial which many people confuse with a spin. The wing is never really stalled. Vipers stall to the right file, his first attempt was a steep sprial .
I would think that ack-ack would be near the top of the list when it comes to the P-38 series in several different flight sims........ and would know how to encroach or produce a " Stall Induced Spin".........
if a person simply stalls the plane out without any rudder input, the only thing to happen would be the nose dropping straight down ( remember counter rotating props equal out prop wash & torque )...... thus, one needs to apply the rudder to induce the spin with the full back pressure or elevator full up position / rudder full either direction desired ....... I would not even question the ability whether ack-ack was initiating a power-off stall correctly an inducing the spin properly or not....... I am sure he hit a hvy buffeting before he introduced right rudder and full elevator up / full stick back........
the same with Viper........ all 3 of his purposely stall induced spins are pretty much identical in their timing and in their recovery........ some he does claim to let spin more than others but his film shows no signs of using "right engine throttle" to recover from any of the spins.... he does use the throttle to increase speed once he had recovered the spin enough to use both throttles to get speed to pull out.....
edit: if you are hitting the rudder "post stall" after the nose has started to drop then you are not inducing the spin, you have already stalled and are approaching a nose down atitude without any input
you are stalled once you have reached beyond a medium buffet / full volume stall horn.......... at this point you are post stall or on the other side of the stall edge..... if you are waiting for the wing(s) ( since this is a P-38L and it is balanced ) to lose lift and drop then you use rudder....... this is more of entering a spiral dive because you are waiting to long to induce the spin.......
from my experiences anyways
Stall induced spin? LOL.
All spins occur as a result of an aggrivated stall where one wing is stalled more then other.
Yes, it is a Stall Induced Spin........ to get the plane to spin one has to induce the stall and then use cross control, as has been mentioned by several others in this thread already....
the cross controls are the left ( or right ) full rudder and full back (elevator up ) on flight stick or yoke.....
hope this helps
TC