Re: Air Conditioning on Type XXI's ?
Posted by:
J.T. McDaniel
()
Date: June 23, 2002 08:03PM
The latest research, which seems to have gone back to older sources, suggests Turtle used water ballast, but not a ballast tank. The operator just let water into the bottom of the hull. There was also 200 pounds of lead that could be dropped, attached to a 50 foot rope to allow recovery. It appears that Sgt Lee attacked HMS Eagle with his feet wet.
A major difference between Turtle and Hunley was that Turtle would flood down to as close to neutral buoyancy as possible, then use an uphaul/downhaul screw to change depth, while Hunley used planes. A lot of research subs use a modern version of the Turtle's screws, since it allows depth adjustment without the need for the boat to be moving.
J.T. McDaniel
A major difference between Turtle and Hunley was that Turtle would flood down to as close to neutral buoyancy as possible, then use an uphaul/downhaul screw to change depth, while Hunley used planes. A lot of research subs use a modern version of the Turtle's screws, since it allows depth adjustment without the need for the boat to be moving.
J.T. McDaniel
