Second-rate squirts. (jet-propulsion in the animal and physical worlds) From: Discover | Date: August 1, 1994| Author: Vogel, Steven | COPYRIGHT 1994 Discover. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

What could be simpler than a jet? All you have to do is squirt a fluid--either gas or liquid--in one direction and you get propelled in the other. The process can drive an airplane, a ship, or a submarine. It even works in a vacuum, so a squirt will spur a spacecraft.

* And what could be more natural for an animal? Wrap a muscle around a bag of liquid and give the bag a squeeze--out will come liquid through any hole, deliberate or fortuitous. Someplace or other, almost e...

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