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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Cyclic Pitch A number of new parts made a simulated cyclic system possible. Real helicopter cyclic works by changing the pitch of individual blades as they rotate using a swashplate. Click for an animation of the cyclic in motion.

Fore-aft motion of the stick pushes and pulls the cable using a ball joint. The flex cable runs up to a link which lifts the swashplate using a suspension control arm!

Click for an animation of the cable in motion. There is one flex cable and sleeve for each axis.

LEGO Technic Rettungshubschrauber () | eBay

Lateral motion of the stick rotates an axle which runs aft. 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. This model pivots the entire rotor head instead. The nose gear retracts forward via a set of 14 tooth bevel gears. At the end of the axle is a ball joint which connects to another flex cable.

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The next axle pivots a lift arm which deploys the winch boom. Inside the swashplate is a four blade rotor part. Rotating main and tail rotor, ratcheting winch on deployable boom, retractable landing gear, working two axis cyclic. The control of the cyclic is from a stick at the pilot’s position.

LEGO Technic Rettungshubschrauber (8856)

A pair of simulated turbine engines are nestled beneath the main rotor head. Landing Gear The 3 point landing gear retracts using another crank on the port side. The rotor axle drives a spherical ball gear. Each gear pivots a little over 90 degrees. In both the extended and retracted positions the gear rests against a hard stop. The cable runs out to the winch and attaches to a metal hook.

Ldraw file courtesy of Benjamin Wendl.

Click for an animation of the rotors in motion. Rotors The rotors’ rotation is driven by an input crank on the left side.

If a real helicopter did this it would risk striking the rotor against the frame. 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.

Because of the shape of the gear, the rotor can pivot on two axes while still rotating. The second crank attaches to a 16 tooth spur gear used as a ratchet plate. This flex cable attaches to a ball joint on the side of the swashplate.

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Whirlwind Rescue | Brickset: LEGO set guide and database

A set of 14 tooth bevel gears drive the second axle which works as a cable drum. This crank drives 885 set of 14 tooth bevel gears giving the main rotor a ratio of 1: The first crank turns a worm gear which drives a 16 tooth spur 885. The final gear ratio is Here another set of 14 tooth bevel gears drives the 4 blade tail rotor. The main gear pivots forward via a 24 tooth crown and spur gear.

Model by Eric Albrecht.

Instructions For LEGO 8856 Rescue Helicopter

The crank turns a worm gear which mates with a 24 tooth spur gear. Rescue Winch A pair of cranks on the starboard side operate the rescue winch on the port side. Click for an animation of the landing gear in motion.

The ball joints also keep the swashplate from rotating. The spur gear drives an axle which runs both forward and aft.