Both force and acceleration signals may be squelched during periods of high yank or high jerk. In other words, when the first derivative of some combination of the force and acceleration signals exceeds a threshold, both signals may set to zero. Most of the error due to non mass like mechanical impedance in, say, a semi-trailer loaded with shifting cargo, may be eliminated.
Since this was first posted a study showed that cross training on machines for strength helped runners and cyclists but not swimmers. Their theory was swimming was so highly technical upper body strength wasn't all that important. Another theory is that the limiting factor for some swimmers is heart lung so efficiency is all important. In any event missile guidance system gyros might not be necessary to improve your stroke. Three axis MEMS accelerometers are cheap and a dozen or so on a full body swim suit with water proof data acquisition could track a swimmer's stroke good enough. The traces could later be compared to someone who knows how to swim. Instrument the hands wrists elbows shoulders and hips and maybe the feet. Kicking should only be used for trim, not propulsion anyway.
Modify an ink jet printer to deposit electrolytes on a foil electrode or anode. Roll it up and desktop printing becomes desktop battery manufacturing.
Originally this was for tracking bin Laden by satellite. Reflective fibers could be scattered over vast areas and oriented by wind or the earth's magnetic field. Where they were disturbed would show up on a satellite image. A drone would then be dispatched to determine if it was a herd of sheep or someone who should have stayed in his cave. A much smaller version could be used to see what part of your kitchen counter is a popular night spot for cockroaches.
The coefficient of restitution is irrelevant.
Propulsion is inherently limited to low jerk movement and helicopters are limited by low acceleration as well. This is why so many helicopters are shot down. It would be better to design the helicopter in two sections. If the sections were side by side each would have it's own rotor for lift. If one section was above the other then the traditional configuration would do. When the chopper comes under fire the pilot and passengers buckle their safety belts and hydraulics start to accellerate the two bodies off of each other. The center of mass and the center of the heat image should preferably be away from anything critical to flight.
On the plus side no fuel is required, just water for cooling and heating. On the minus side it is a very low speed vehicle. Water is sprayed onto a hot road as it passes under the front of the vehicle. The water evaporates off the road and carries the heat to the hot side of a low temperature difference vapor or air engine. Before the water is sprayed onto the road bed it is preheated by the cold side of the engine. The water may be evaporative cooled while in the tank to increase the delta T.
Unless the price of nano tubes or graphene comes down a lot this might only be useful on a planet with an atmosphere made up of molecules much heavier than air. Do the numbers and even an icosahedral based structure made of carbon fiber doesn't have the strength to weight necessary to fly on earth.
You cycle past a picket fence and your luminescent shirt developes horizontal bars to contrast with the fence.
The two or more "different" fields are only superficially different, or just different enough to provoke some thought.
The same also holds for technological innovation. No political freedom => no inventing.