A078

DESIGN: SynchroLite ~ Power Train (for 1 engine)

Outside Helicopters:

Miscellaneous:

For general information on power trains see: Mechanics

Also see; OTHER: Mechanical - Bearings ~ Transmission

SynchroLite:

Final Reduction:

The final reduction is one single unit. The X-over synchronization portion also serves as the final reduction.

Or, seriously consider the worm & wheel for reduction and power transmission, particularly if the efficiency can be improved. See DESIGN: SynchroLite ~ Power Train - Layout - Ball Worm & Wheels

Engine Induced Rotational Acceleration and Deceleration:

The firing of the engine's cylinder(s) will result in rotational acceleration and deceleration. Engines with fewer firings per revolution of the crankshaft, in other words fewer cylinders and 4-stroke vs. 2-stroke, will result in greater acceleration and deceleration. This 'jarring' must be isolated from the power train. Attaching a flywheel to the engine would help but this will add unnecessary weight and not reduce the shock on the components of the engine. The Robinson uses V-belts.

Am using the Robinson V-belt style for soft start and rotational vibration damping.

Notes:

Reliability:

Consider having the final transmission as a totally sealed unit (with the possible exception of changing oil). Maintenance to this gearbox might only be done by authorized representatives, or perhaps on an exchange basis. Sensors could be located within the gearbox to record specific past activity.

Needle Bearing:

It appears, from a comment The book 'Whirlybirds' that needle bearings are a no-no in transmissions..

Oscillation during Autorotation:

If the drive train between the two rotors is too complex, or too light, there may be the opportunity for an oscillation to start between the two rotors that could destroy the drive train and craft.

Consider having a slip fit spline on one end of the shaft between the primary and secondary gearboxes. This will allow for thermal expansion and eliminate the need for a coupling.

Same Page ~ Different Craft: ~ UniCopter ~ SynchroLite (w/ 2 engines) ~ Dragonfly

Last Revised: April 14, 2008