The hub, which attaches the rotor to the wheel, stays in place. “It's a huge design advantage because you reduce labor and materials cost for servicing the brakes,” he says.

To that is added a slip-on rotor. With this configuration, the rotor can be removed without the hub and it simply slips off the wheel studs, similar to the F-150 4WD design.

Sikorsky plans to flight-test a low-profile hub-mounted active vibration suppressor (HMVS) that could replace the passive, tuned pendulum system now used on the S-92.