LEGO Yellow Propeller 2 Blade 5.5 Diameter has been used in at least 38 LEGO sets over the past 39 years, since it was first used in 1985. You can also find this part in at least 10 other colours. It has a design ID of 4745 which can usually be found molded into the bottom of the part.
3 X LEGO PROPELLER 3 BLADE 5.5 DIAMETER Yellow Brown P/N 4617 (4745) X1 £3.50 - PicClick UK
Propeller 3 Blade 5.5 Diameter : Part 4617
LEGO® 92842 4599984 - 6360206 - ToyPro
LEGO Alpha Team: Blue Eagle vs. Snow Crawler (4745) for sale online
LEGO Yellow Propeller 2 Blade 5.5 Diameter (4745) wth Mounting Brick
Blue Eagle versus Snow Crawler 4745 - LEGO® Alpha Team - Building Instructions - Customer Service - US
LEGO Propeller 2 Blade 5.5 Diameter (4745) Comes In
BrickScout - Product search in Parts/Propeller
LEGO Propeller 4 Blade 5 Diameter with Rotor Holder (3461)
LEGO® 52 6074928 - 6176584 - 6194508 - ToyPro
BrickScout - Product search in Parts/Propeller
Propeller 3 Blades Diameter 5 - LEGO® Part 92842 - Super Briques
3 X LEGO PROPELLER 3 BLADE 5.5 DIAMETER Yellow Brown P/N 4617 (4745) X1 £3.50 - PicClick UK
Peeron: Helicopter (#390-1)