Reply To: Porta's Derivation of Lempor Theory

[Chris Corney]

Hello Martin,
No, a helix is the shape of a coil spring. When steam leaves the nozzle it will travel in a straight line.
An example of a hyperboloid is the traditional concrete power station cooling tower, where the steel reinforcing bars travel in a straight line from the base to the top of the tower, inclined at the appropriate angle. Other examples are in the pictures in the Wikipedia page above.
Regards
Chris