Rocket Men

theodp writes "Slate reports on the guys who really, really want to fly, who got together the other week at the Niagara Aerospace Museum for the First International Rocketbelt Convention. To date, only 11 men in history have free-flown a rocketbelt (aka JetPack). More men have walked on the moon. Why? 'It's not a matter of if you get hurt, it's when,' says Eric Scott, an ex-stuntman who's in the exclusive club."

Comments

Gyroscopic stabilizers

[Anonymous Coward]

These people need computer-controlled gyroscopic stabilizers. A fly-by-wire system could dramatically improve the safety of rocketbelts. No doubt that would make them much more popular.

Re:Gyroscopic stabilizers

[evanbd]

And while we're at it, that's a *hell* of a lot easier said than done. You can't do it on cheap gyros (read: you're probably spending $5-10k per axis), and they're not particularly light weight (a couple pounds each may not seem like much, but it eats into your fuel budget quite quickly). And you need a *good* control program, which isn't easy to write. Getting it mostly right wouldn't be too hard, but would you trust your safety to "mostly right"? To date, only one VTVL rocket vehicle has demonstrated fully autonomous takeoff, hover, and landing (John Carmack's vehicle over at Armadillo Aerospace). It ain't easy.

Also, don't forget you have to build the rocket motors and feed system and such. Most belts so far are peroxide monopropellants -- a good choice IMHO, but peroxide is hard to get and takes a lot of care to handle safely. And building any size rocket motor and ensuring it's safe enough to stand next to is a bit of work.

What I'm saying is, if you're a single amateur, or a small group, then building just the rockets is a big project unto itself. It shouldn't surprise you that no one has the time, money, and skills to do that, *plus* build and test the IMU, *plus* write fly-by-wire control software for it. If a modest sized startup company decided to pursue the matter, with a bit of financial backing, I would expect they could get it all built without too much hassle (provided they had the appropriate expertise in all areas, obviously). Oh, and don't forget that your software has to handle a non-fixed CG if the person moves about much at all.

Re:Gyroscopic stabilizers

[jcr]

You can't do it on cheap gyros (read: you're probably spending $5-10k per axis),

Why not? There are gyros that model helicopters use that are cheaper than $100, and an RC chopper is a whole lot twitchier than something with the mass of a human being in it. If your flight only lasts for a couple of minutes, then you hardly need high-precision gyros that won't drift more than a degree per hour.

-jcr

Re:And this is different from

[Excen]

Well, for a start, you are much less likely to run out of fuel 18 metres up in the air while on a skateboard...

What? You mean those Mountain Dew commercials aren't accurate representations of the sport of skateboarding?

How many people have flown a jetpack?

[Brad1138]

To date, only 11 men in history have free-flown a rocketbelt (aka JetPack)

Make that 12, your forgetting Duke Nukem.

On the Fringe

[tb3]

The (strange/interesting/sad) part of this story is how far out the people involved are. I noticed there was no mention, either in the Slate article or the actual convention website, of these guys who claim to have the only functional rocket belt in existence. Then there's Juan Manuel Lozano, the Mexican inventor who claims to developed a break-through method for creating the 90%-pure hydrogen peroxide fuel needed for the rocket belt.

And then there's the whole RB2000 saga, which involved fraud, murder, and the disappearance of the only prototype. The full story can be found on the rocketbelt.nl site. Rocketbelt developers are out there on the edges with the ufologists, perpetual motion researchers, and free energy salesman, with the exception that rocketbelts can actually work!