• Overrunning Clutches and Backstops
• Electric Clutches and Brakes
• Engineered Couplings
• Custom Gears and Gearbox Components

Overrunning Clutches and Backstops
for Rotary Wing Aircraft Applications

Ideal for:

• Autorotation
• Twinning
• APU drives
• Accessory gearboxes

Formsprag Clutch is the preferred overrunning clutch in rotary wing applications. Formsprag Overrunning Clutches permit drive during normal operations and autorotation during emergency situations. Sprag clutches are integral to the transmission gearboxes of multi-engine helicopters to allow twinning of the engines for efficient power sharing and synchronization or disengagement of one engine. As purely mechanical devices they require no pilot or flight control input.

Formsprag Clutch Overrunning Clutches Also known as sprag retainer assemblies, one-way clutches, or freewheels Free-action retainers Positive Continuous Engagement (PCE) sprags Formchrome sprags Instantaneous action with no backlash, high torque density