The 8215 Gyro Copter was the first and only Auto Gyro in the Technic line-up, although arguably it is actually some sort of hybrid helicopter instead. In a real auto gyro the main rotor is not powered but auto-rotates as air flows over it. It is therefore as analogous to a wing as to a rotor. Forward thrust is provided by a traditional longitudinally mounted propeller. In the case of this model, both the rotor and the prop are geared together. The model uses uncommon yellow flex tubing as a curved cockpit. The cockpit is scaled for a Technic figure although the model does not include one at this low price point. This is an example of one of the very simplest Tech Play models designed for a beginner Technic audience.
The rotor's and propeller's rotation is driven by an input crank on the left side. This crank drives a 24 tooth crown gear. Both the rotor and propeller are geared via an 8 tooth pinion from the input crank, therefore both turn at the same rate with a ratio of 3:1 with respect to the input crank
The main rotor has 3 blades and uses the Technic rotor hub to construct the blades with plates. The prop is a specialized monolithic part.
The tricycle landing gear uses old standard pulleys and tires. The whole undercarriage makes extensive use of the new angle connectors.
By Technicopedia