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effective pitch
negative thrust propeller / negative-thrust propeller
non-uniform pitch propeller
adjustable-pitch propeller
geometric(al) pitch of propeller
variable-pitch propeller
controllable-pitch propeller
fixed-pitch propeller
Up (Pitch 90 deg) / Down (Pitch -90 deg) Reference
effective and efficient
effective casualty(-producing) radius
effective date (E-Date)
effective fire
effective rate of fire
high volume of effective fire
maximum effective range
minimal effective dose
zone of effective fire
effective beaten area
effective field of fire
effective depth of fire
effective fire depth
central effective zone
create an effective basis for recruiting
effective fragmentation radius
effective horsepower
effective output
effective penetration
effective rate
have an effective range of
missile effective rate
missile launcher effective rate