LEGO 8856 PDF

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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Rotors The rotors’ rotation is driven by an input crank on the left side.

Lego Technic Whirlwind Rescue (8856)

The next axle pivots a lift arm which deploys the winch boom. The main gear pivots forward via a 24 tooth crown and spur gear.

If a real helicopter did this it would risk striking the rotor against the frame. The first crank turns a worm gear which drives a 16 tooth spur gear. Click for an animation of the winch boom deploying. The crank turns a worm gear which mates with a 24 tooth spur gear.

This model pivots the entire rotor head instead. The control of the cyclic is from a stick at the pilot’s position. Rescue Winch A pair of cranks on the starboard side operate the rescue winch on the port side. 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.

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In both the extended and retracted positions the gear rests against a hard stop. Inside the swashplate is a four blade 856 part. Click the image to download the LDraw file of this model.

Ldraw file courtesy of Benjamin Wendl. The cable runs out to the winch and attaches to a metal hook. Rotating main and tail rotor, ratcheting winch on deployable boom, retractable landing gear, working two axis cyclic.

Model by Eric Albrecht. Click for an animation of the rotors in motion. The rotor axle drives a spherical ball gear. The ball joints also keep the swashplate kego rotating. Because of the shape of the gear, the rotor can pivot on two axes while still rotating. Real helicopter cyclic works by changing the pitch of individual blades as they rotate using a swashplate. 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.

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Lateral motion of the stick rotates an axle which runs aft. Click for an animation of the cyclic in motion.

LEGO Technic Rettungshubschrauber (8856)

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.

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.

LEGO Rescue Helicopter Instructions , Technic

Fore-aft motion of the stick pushes and pulls the cable using a ball joint. Each gear pivots a little over 90 degrees. This crank drives a set leggo 14 tooth bevel gears giving the main rotor a ratio 88566 1: A set of 14 tooth bevel gears drive the second axle which works as a cable drum. The final gear ratio is This flex cable attaches to a ball joint on the side of the swashplate.

At the end of the axle is a ball joint which connects to another flex cable.

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