View LEGO instructions for Rescue Helicopter set number to help you build these LEGO sets. Set , released in , is the best helicopter ever released in the Technic line in my opinion. It’s big and it’s functional. This set is similar to a Sikorsky HH- Find great deals for Lego Technic Whirlwind Rescue (). Shop with confidence on eBay!.
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The crank axle also drives a set or gears made up of a 24 tooth crown mating with two stacked 14 tooth bevel gears one of the rare places this pairing is made which passes torque along the length of the boom to the tail through 3 universal joints. Because of the shape of the gear, the rotor can pivot on two axes while still rotating. The first crank turns a worm gear which drives a 16 tooth spur gear. Click for an animation of the winch boom deploying. Lateral motion of the stick rotates an axle which runs aft.
This flex cable attaches to a ball joint on the side of the swashplate. The cable runs out to the winch and attaches to a metal hook. Click for an animation of the rotors in motion. A set of 14 tooth bevel gears drive the second axle which works as a cable drum.
Fore-aft motion of the stick pushes and pulls the cable using a ball joint. If a real helicopter did this it would risk striking the rotor against the frame. Cyclic Pitch A number of new parts made a simulated cyclic system possible. The rotor axle drives a spherical ball gear. Rescue Winch A pair of cranks on the starboard side operate the rescue winch on the port side.
Legl for an animation of the landing gear in motion. Ldraw file courtesy of Benjamin Wendl. The final gear ratio is The flex leego runs up to a link which lifts the swashplate using a suspension control arm!
LEGO Rescue Helicopter Instructions , Technic
In both the extended and retracted positions the gear rests against a hard stop. The ball joints also keep the swashplate from rotating. Real helicopter cyclic works by changing the pitch of individual blades as they rotate using a swashplate. Landing Gear The 3 point landing gear retracts using another crank on the port side.
The spur gear drives an axle which runs both forward and aft. Inside the swashplate is a four blade rotor part. Each gear pivots a little over 90 degrees. Rotors The rotors’ rotation is driven by an input crank on the left side.
At the end of lebo axle is a ball joint which connects to another flex cable. This crank drives a set of 14 tooth bevel leog giving the main rotor a ratio of 1: Click the image to download the LDraw file of this model. Click for an animation of the cyclic in motion. Click for an animation of the cable in motion. Here another set of 14 tooth bevel gears drives the 4 blade tail rotor.
A pair of simulated turbine engines are nestled beneath the main rotor head. This model pivots the entire rotor head instead.
Model by Eric Albrecht. The next axle pivots a lift arm which deploys the legp boom. Rotating main and tail rotor, ratcheting winch on deployable boom, retractable landing gear, working two axis cyclic.
Lego Technic Whirlwind Rescue (8856)
The nose gear retracts forward via a set of 14 tooth bevel gears. The control of the cyclic is from a stick at the pilot’s position. There is one flex cable and sleeve for each axis. The main gear pivots forward via a 24 tooth crown and spur gear. Lebo crank turns a worm gear which mates with a 24 tooth lsgo gear. For example, the leading and trailing blades may be at 10 degrees of pitch, while the port and starboard blades are at 5 and 15 degrees respectively.
The second crank attaches to a 16 tooth spur gear used as a ratchet plate.