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"Magnetic Field Architecture" and the HENDO Hoverboard - *ALMOST* a real hoverboard

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Patrick

Fri Oct 24 2014, 06:03AM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

ive been seeing videos and stories on the national cable news channels. But as others have said, it all comes down to power stored, vs. power consumed.

this is the very problem many of us have with light aircraft, spacecraft and micro-drones. Even the best LiPo/LiFe batteries are just terrible for run time.

Sigurthr wrote ...

Not real promising. I figure a common hobby 50C 3S 6Ah lipo might get me a minute of "flight time" if the system was incredibly efficient.

I use one of these batteries in my current drone for 8 minutes of flight time. so if a teenie-bopper has less mass, and you pile ten LiPo's on it, you might get a few minutes of useful time in a skate park.

Uspring

Fri Oct 24 2014, 08:54AM

Registered Member #3988 Joined: Thu Jul 07 2011, 03:25PM
Location:
Posts: 711

this is the very problem many of us have with light aircraft, spacecraft and micro-drones. Even the best LiPo/LiFe batteries are just terrible for run time.

Nice analogy, especially if you consider, that the lift to power consumption ratio improves with rotor area or number for hover boards similar to helicopters.

BigBad

Fri Oct 24 2014, 01:59PM

Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600

If I was doing it I would probably try to use an IC engine, like a model aircraft engine.

Patrick

Fri Oct 24 2014, 03:20PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

BigBad wrote ...

If I was doing it I would probably try to use an IC engine, like a model aircraft engine.

I have a glow-drone battery replacer here on the forum some where. But the Planar-ferrite and drone-prop projects have my full attention right now, so i cant help anyone out on such a solution, though i really think IC is the way to go.

Conundrum

Sat Oct 25 2014, 08:47AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059

Possible ideas: metamaterials (not quite superconducting but still viable) and materials more magnetic than sintered NdFeB yet to be discovered ?

BigBad

Sat Oct 25 2014, 01:23PM

Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600

It's the conductivity of the plate that's the problem. Silver, graphene or superconductors are better than copper.

At high frequencies, you need litz wire loops, and poles big enough to fill them.

dexter

Sat Oct 25 2014, 03:34PM

Registered Member #42796 Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195

BigBad wrote ...

It's the conductivity of the plate that's the problem. Silver, graphene or superconductors are better than copper.

At high frequencies, you need litz wire loops, and poles big enough to fill them.

if only those materials were cheap.....

BigBad

Mon Oct 27 2014, 04:34PM

Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600

I don't think by normal standards this is expensive.

Per metre the aluminium is about Â£200 for a 4m wide strip.

Compare this to a road for example, a road will cost about Â£1000-Â£3000 for roughly the same width; so topping them with aluminium adds very little cost; it would last ages, and it doesn't wear.

So you could quite conceivably put aluminium channels everywhere and use that instead of roads.

Nucleophobe

Mon Oct 27 2014, 05:35PM

Registered Member #108 Joined: Thu Feb 09 2006, 11:44PM
Location: Billings, MT
Posts: 61

BigBad wrote ...

I don't think by normal standards this is expensive.

Per metre the aluminium is about Â£200 for a 4m wide strip.

Compare this to a road for example, a road will cost about Â£1000-Â£3000 for roughly the same width; so topping them with aluminium adds very little cost; it would last ages, and it doesn't wear.

So you could quite conceivably put aluminium channels everywhere and use that instead of roads.

I'm not sure I follow - you need to consider cost per length for aluminum channels vs. traditional asphault road. A road costs "about Â£1000-Â£3000" for what length?
*EDIT: Apparently I can't read. You said "Per metre...", but you didn't specify the thickness. Anyway, I verified your claim I guess!
********************************************
Some quick numbers I found say that it costs ~$6 million (USD, or ~Â£4 million) per lane per kilometer of asphault rode

If, in addition, two narrow aluminum channels, say 60cm wide x 0.5cm thick, were to added to the road surface, that's about 10m^3 of aluminum per km. Density of aluminum is ~2700 kg/m^3, so we are talking about 27000 kg of aluminum at about $2 / kg... so only ~$60000 / km / lane? (or Â£40000 /km /lane) Wow.

I hadn't thought of the fact that you would only need two narrow channels rather than coating the entire surface.
***************************************** ***

Still, losses with wheels are not so bad. Even if you go through all the trouble to make aluminum-plated roadways for hovering vehicles, you will still have aerodynamic drag. I'm not sure what you really gain other than cool factor and (maybe) a smoother ride.

Patrick

Mon Oct 27 2014, 06:11PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

Where are we to mine all this aluminum, which will be permanently out of circulation for other purposes?

During WW2 and the cold war, the US, UK and others were desperate for aluminum, copper, mercury and other metals.

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