Quote:
| Originally Posted by Codger Peripheral Drives are called Ducted Fans when they are moving air instead of water. Substantial increases in efficiency in air. Flew a small aircraft once with that configuration, worked very well. Wonder if the same holds true in water. Any hydrodynamicists hanging around here? |
Kort nozzels are ducted marine propellers. These are very good for maximizing thrust of the enclosed prop on tugs, etc, but suffer from higher drag at higher boat speeds.
Note that the peripheral drive is significantly different than a ducted fan(prop) unit in that the blades are attached at the perimeter wall rather than just 'in close proximity'.