Traction drive transmission research
For the engineering guys,
NASA did several studies on traction drive for helo transmissions.
Traction or friction drive is gears without teeth, or in other words, rollers that transmit power. Some locomotives used friction drive.
Sounds odd, I know, but it may have some advantages like long life at high speed and low noise.
I see several of the studies are on the web but none that could be downloaded.
Anybody have knowledge of what the current thinking is with respect to traction drive?
Thanks,
slowrotor