And this is also very cool...
Solves your guidance problem too when put the sucker on rails:)
The fact sheet talks all about the benefits and practical applications of the sled for military technology, but you know that the only thing on the minds of its engineers at the time of the project was shattering the world record.
I'm going to guess around 105 grand at the half metre mark. A 1 metre dunking would be much more expensive.:)
Dunno about those earphones eating batteries. Hearing aids last forever on the little lithiums and they draw more I'm certain.