BOCA BEARINGS 2015 INNOVATION COMPETITION

Single Feed Contra-Rotating Propeller Hub

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Presented By:
Philip Cox
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ABOUT THIS PROJECT


Tell us briefly about your project. Is it a work of art or does it serve another function?

Contra-rotating propellers are much more efficient and operate without inducing torque on an airframe. This is a retro-fit hub that enables a single drive shaft to power two contra-rotating propellers. It is compatible with RC aircraft engines/motors. The video shows it coupled to an O.S. Engines LA-40 glow engine.

When did you start working on this project and how long did it take you to complete?

I've been designing it off and on for about five years.

What was your goal in building this project?

I wanted to provide an elegant mechanical solution to the problem of induced torque and propeller efficiency applicable to RC aircraft, light aircraft, and quad-rotors.

Does your project help to solve a problem? If so what problem?

Previous versions of contra-rotating props use a more complex transmission that uses two nested drive shafts to turn the propellers in opposite directions. This version uses only one drive shaft; hence, it is easy to retrofit to existing aircraft with little or no modification.

What makes your idea unique?

It uses SPHERICAL coordinate system mechanical drive, rather than rectangular coordinates for the gear train. That permits the system to be compact. It uses a single rotating shaft rather than two nested rotating shafts - which previous contra-rotation systems used.

In what capacity are you using bearings and what type of bearings?

There are six pinions (think of them as planet gears in a planetary transmission) that use miniature ball bearings, a central spindle bearing to separate fixed parts from the rotating drive shaft, and a thrust bearing between the engine drive flange and the hub.

What is the most important thing you want people to know about your project?

It uses SPHERICAL coordinate system mechanical drive, rather than rectangular coordinates for the gear train.

How will you use the $5,000 prize?

I will use the $5K to expand the hub's design space and adapt it to a variety of motors, engines, and applications - such as electric drive and quad-rotors.

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