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I suggest designing a submarining, video and audio equipped UAV that looks and acts like a flying fish. It could be used to investigate ports, war ships, topless beaches, etc.
Flying fish 45 second flight
Flying fish 45 second flight [Sunstone, May 26 2008]
(?) Flying Fish UAV, U Michigan, 2008
Here you go. [jutta, May 26 2008]
(?) Floating, flying, killing UAV
It floats, it flies, it eliminates enemy targets-meet the water-launched unmanned enforcer Lockheed Martins Skunk Works [Sunstone, Jan 18 2009]
UK team builds robot fish to detect pollution
The carp-shaped robots, costing 20,000 pounds ($29,000) apiece, mimic the movement of real fish and are equipped with chemical sensors to sniff out potentially hazardous pollutants, such as leaks from vessels or underwater pipelines [Sunstone, Mar 22 2009]
MIT Designs Ultra-Efficient, Flying Fishlike Planes [Sunstone, Sep 16 2010]
One day it will fly too [Sunstone, Nov 28 2012]
This Drone Can Fly, Swim, Drive, and Hop Its Way Through a Mission
"Its wings become fins as it dives into water" [Sunstone, Nov 11 2013]
Navy spy "fish" could be operational next year
A team of civilian engineers and military officers are testing the capabilities of a 5-foot, 100-pound experimental robot that's designed to look and swim like a bluefin tuna [Sunstone, Dec 12 2014]
quadcopter submarine mix
This remotely controlled quadcopter can transition from flight to underwater mode and back seemingly with ease. [Sunstone, Dec 15 2015]
Loon copter makes it now baked
Loon Copter drone flies, floats and dives underwater. Just need to disguise it as a flying fish. [Sunstone, May 03 2017]
||That'd work great, except for places where flying fish are attention-grabbing oddities, and places where people expect you to halfway invent something instead of just suggesting that someone else do all the work. Spy bots that mimic animals are certainly thought of, and chances are good that somebody else will think of mimicking a flying fish. They may decide that a splashing, sparkling, zipping thing that only gets a foot above the water isn't as good as a slow, stealthy sub with a periscope, or a birdlike thing that really flies.[-]
||[baconbrain] so you want "I suggest designing" changed to "Build"
||No, I want "I suggest designing" changed to "An UAV could be made to mimic a flying fish if it used a little water propeller on the end of a long flex shaft."
||That first link is cool. Every couple of seconds (every 20 yards) his tail kicks off the water surface. The fish's body is out of the water for 45 seconds... It must be good at holding it's breath.
||Might want to pick some animal that's a little less attention grabbing. Also, you can't fly very high or long if you want to mimic the animal in a natural fashion which might limit it's usefullness. A "flying fish" moving at 300 mph 500 feet in the air might tend to attract interest.
||Like BB says, you'd also be limited to areas where these fish are found. Fly one of these over a Siberian early warning radar at 300 mph, 500 feet in the air and I think you're pretty much busted.
||Gives me an idea for "Unbelievable Sighting Report
||"Let me get this straight, you're reporting that
Spiderman just flew over your house? You're aware
that, A) Spiderman doesn't fly, he swings from a
web and, B) he's a fictional character right?"
||Might give you those precious few extra minutes
loitering time while your troops swept in to get
the bad guys.
||Make them look like rude body parts and people
might even be embarrassed to call them in.
||Just for the record, I had a flying fish once that I made a couple of fish prints from before I foolishly disposed of it.
||If anybody EVER comes across the opportunity to secure another, I'll happily pay shipping.
||Reading that article about the Navy spy "fish" makes
me worry that if such things are widely deployed, in
the event of a war, the real looser could be all the
fish. If we make them indistinguishable from fish,
the only defense will be to kill all fish. Sort of like
using agent orange on the jungle to find the people
||Fish are already pretty loose.