In any case the propeller will bend only on contact with ground/water, and it happens very fast (I saw it myself, more than once in real time), so fast that a two state modelling will simulate it well enough.
Fine tuning would be to add a model with only one blade bent, and a model with two blades bent (if 3 blades or more) to account for landings with a stopped engine.
Also the bent shape will not be the same for a fully solid propeller and a hollow core propeller; to finish wooden blade propeller and plastic propeller blades disintegrate but do not bend (no surprise there!)...
JV
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