Betrieb in this sense definitely indicates "operation", and yes you are right "schlepp" does mean "drag, and there is such a thing as "drag operation" for turbines.


Usually this is for VAWT, (Vertical Axis Wind Turbines" which are either lift or drag operation. (See second link)

Also found on the Net, a trubine disc site, (see first link).

The state-of-the-art double-drag system.

The lightweight Turbine Disc series incorporates the benefits of the revolutionary Turbine Drag system (no inertia at startup, automatic drag change in relation to the speed of the fish and no overrun) with the braking power of a proven disc drag. So, let the fish run against the turbine drag. Then, if you need to pull the fish out of a current or back to the boat, turn on the disc drag. All are machined from solid 6061-T6 aircraft grade bar stock aluminum and feature stainless steel bearings for long life and smooth operation. Available in Gold or Titanium anodized finishes for corrosion protection. Spare spools are available. Simple to change between left and right hand retrieves.



--------------------------------------------------
Note added at 2002-08-08 04:35:35 (GMT)
--------------------------------------------------

For fishing, use the first web link reference and the text at the bottom of my first posting, cheers.