Toypedo
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The Toypedo is a hand-launched projectile developed by Swim Ways. It is a sleek, fin-stabilized hydrodynamic design resembling a rocket or missile and painted a variety of bright colors in newer models or molded of brightly-colored rubber a là the Super Ball in the older, original design. It has been patented as a "Hand-launchable underwater projectile toy" by Jon A. Warner in 1999.[1] It is designed to have a specific gravity of between .95 and 1.05 relative to water, giving it a neutral buoyancy. This, combined with its streamlined fin-stabilized shape gives the Toypedo its interesting ballistic properties underwater.
This interesting pool toy is claimed to be able to travel up to forty feet underwater[2] with a 'strong throw'.