The advantage of having a dynatwist type filter with ducting from the wing, means that any stones of heavy debris, is unlikey to be sucked up the whole distance of the ducting, and not get to the air filter.
One situated in the wing is of course in the firing line so to speak, of ann stones and debris. But regular cleaning should be ok.
One situated in the wing is of course in the firing line so to speak, of ann stones and debris. But regular cleaning should be ok.