Originally Posted by
Vzlet
It's my understanding that the inlet devices are intended to prevent vortices that could vacuum gravel.
Correct.
Vortex Dissipators
Prevent vortices forming at the engine intakes which could cause gravel to be ingested by engine. These consist of a small forward projecting tube which blows pressure regulated (55psi) engine bleed air down and aft from 3 nozzles at the tip to break up the vortices.
Unpaved Strip Kit