There are significant engineering challenges to water high speed electric propulsion: amassing enough electrons, cooling of motors & controllers & wires & batteries, corrosion, operator ignorance, etc...
Here is one of the latest efforts: the Green Samba.
http://www.gizmag.com/green-samba-first-viable-electric-pwc/15141/
They are still prototyping, but are targeting 65mph, 3 hour, price competitive. Something's gotta give... I bet it's price.
Notable in their efforts, highly refined twin jet drives, azipod style. Just because jet drives have historically been grossly inefficient, does not mean they will always be.
Mark Stafford
e-H55, e-GEO, e-scooter, bicycle
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