Airframe Design
All motions were to be driven by the wheels under the helicopter. The two sets of main rotors were to rotate in opposite directions, and the tail blade would also spin by the wheel power.
About
Borders Miniature Prototype
Goal: Design, build, and fly a small scale prototype of the intended Borders design in order to gather flight data to prove our design.
Solution: A twin boom aircraft was prototyped and built.
Tools
Design
Duct Design
The exterior design was modeled after the X-2 and S-97 originally, however bulges were added in the center section under the rotors to allow for the gears which were larger than initially expected.
Internal Design
The gearing was generated using Solid Edge. The design was to use bevel gears to transition power between the wheel and main rotors, and between the main rotors and the ground. The ratio is 2:1, to allow the main rotors a slower rotation compared to the tail rotor.
Final Product
The final product was assembled and airbrushed in a military camouflage style.
Side Views
The main rotors used concentric shafts in order to allow for the contra-rotating setup.
In Flight
The gearing bulge can be seen under the main blades by the wheels.
In Flight
The gearing bulge can be seen under the main blades by the wheels.