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I want my own Jet Pack!!!

Clive Maxfield
2/12/2011 09:31 PM EST

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Max The Magnificent
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re: I want my own Jet Pack!!!
Max The Magnificent   9/6/2012 7:11:44 PM
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Again, don't leave us hanging... did Joe ever get in touch?

Max The Magnificent
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re: I want my own Jet Pack!!!
Max The Magnificent   9/6/2012 7:10:59 PM
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A Fuzzy Logic control system might be an interesting alternative

Nancy Harriet
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re: I want my own Jet Pack!!!
Nancy Harriet   1/3/2012 5:15:54 PM
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Dear Joe, Please get in touch. We miss you. Love, Nancy

WKetel
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re: I want my own Jet Pack!!!
WKetel   2/19/2011 5:38:47 PM
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The system using two of the Williams Research engines sounds like the best choice, since jet fuel is safer than gasoline, and one whole lot safer than either that 90% hydrogen peroxide, or the hydazine used in one other unit not mentioned here. Of course, the turbine engines are sort of expensive, and Williams will not sell them to just anyone, even for cash. I found that irritating indeed. But surplus should be a bit cheaper. I did consider twin pulsejet engines, but they are incredibly loud, and very hot, and more work to get started, beside, synchronizing them takes more work.

Joe.Sleator
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re: I want my own Jet Pack!!!
Joe.Sleator   2/19/2011 12:47:18 AM
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Just at the moment it's been interrupted by gainful, yet fun, employment. But hey, a guy can dream, and being in Sydney, it's not too hard to go over there and have a burl on their unit. To Jim: Cold and rain don't scare me, I learned to fly in an open-frame Eipper MXL ultralight. Errant geese and pheasants tend to scare me a bit, though.

Jim Horn
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re: I want my own Jet Pack!!!
Jim Horn   2/18/2011 8:18:38 PM
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The '60s Bell rocket belts ran on purified hydrogen peroxide. The nozzles had silver screens in them which broke the H2O2 down to steam and oxygen. The Blue Flame (speed record car) used that plus liquified natural gas (added to burn in the hot O2 into CO2 and more H2O for higher specific impulse). Later in the '60s Bell made a jet belt using a tiny Williams Research fanjet. Since the oxidizer was the air, it had a much longer duration of flight but was still very limited and much more complex. Of course, the kerosene based fuel was much more docile than the notoriously unstable purified peroxide. Since F=d(mv)/dt, the larger diameter of airstream you aim downwards decreases the power used per unit thrust (a non-obvious but simple derivation). Thus, helicopters have relatively large rotors versus VTOL aircraft like the Harrier which, like rockets, flies as airfoil maestro John Roncz so eloquently put: It turns fuel into noise. And it rises on piles and piles of noise. Like you, I've often lusted after a rocket / jet belt. But considering cold / rainy / etc. weather and the above, I suspect a combination of NASA's Puffin proposal, Rutan's proposals for aircraft navigation and control, and Moore's law will be what we (or our grandkids) will be using in the forseeable future.

Max The Magnificent
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re: I want my own Jet Pack!!!
Max The Magnificent   2/17/2011 3:26:37 PM
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Don't leave me hanging -- what was the result?

Joe.Sleator
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re: I want my own Jet Pack!!!
Joe.Sleator   2/17/2011 9:16:41 AM
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Me too, Clive. So bad, in fact, I made a physics model of one in X-plane just so I could play with the PID coefficients myself to see how easy it would be to tune and stabilize.

Max The Magnificent
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re: I want my own Jet Pack!!!
Max The Magnificent   2/12/2011 9:40:25 PM
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I really, REALLY want one of these...

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