Je was op zoek naar: sistema ad elica (Italiaans - Engels)

nave ad elica
single screw vessel

solcometro ad elica
screw log

molinello idrometrico ad elica
screw current meter

per i velivoli ad elica:
for propeller driven aeroplanes at:

ad elica e/o balestra.
helical and/or leaf spring.

propulsori ad elica per battelli
screw propellors for boats

velivolo ad elica intubata nell'ala
fan-in-wing aircraft

pompa ad elica a passo invertibile
axial flow pump with reversible blades