Every electromagnetic motor has a stator, it doesn't matter if it is a linear or rotary motor 
Technically, they are stators, but since the actual stator (the bare copper inside the white plastic casing) is not exposed, I don't see any reason they cannot be called launch fins.
I also expect in the next hour:
Technically, they are stators, but since the actual stator (the bare copper inside the white plastic casing) is not exposed, I don't see any reason they cannot be called launch fins.
I also expect in the next hour:
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