B257

DESIGN: SynchroLite ~ Control - Flight - Directional

Outside Helicopter

Flettner FL-282:

Use differential torques (differential collective pitch change) and rudder. Only the rudder could give steering during autorotation.

Kaman:

Uses differential torques and also uses opposed longitudinal cyclic.

DeGraw (Hummingbird):

Uses only differential torque. This differs from information on OTHER: Helicopter - Outside - Intermeshing - DeGraw - Hummingbird

Synchropter

Notes:

Uses differential longitudinal cyclic and ruddervator (or stabilator) control.

Note: It may be necessary to use differential collect in lieu of or in addition to differential longitudinal cyclic. This is because of the blade clearances, particularly when there are external forces such as gusts. See DESIGN: SynchroLite ~ Rotor - Disk - Blade to Blade Clearance

Potential Means of Improving Yaw Control:

Variable Vertical Fin Concept (VVF)

Consider having the exhaust exit at the end of the tail tube and locate a small rudder (deflector) in the exhaust stream.

Consider a small electric Fenestron in the VS. Electric because it will be used so infrequently and it might just be a supplement to another idea.

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Last Revised: March 12, 2007