A DoD design contract?

[martin griffith]

A PSU design challenge here

http://www.networkworld.com/community/?q=node/17268

maybe CircuitCellar could do it as a project


martin

 

[Phil Allison]

"martin griffith"

A PSU design challenge here

** It is nothing of the sort - dickhead.

http://www.networkworld.com/community/?q=node/17268


The DOD details are here:

http://www.dod.mil/ddre/prize/rules_doc.html

Looks like a devious way to get a military grade, wearable *fuel cell*
battery pack designed and prototyped on the cheap.

Get the Chinese to mass produce them for $50 a pop later .





........ Phil

 

[martin griffith]

"martin griffith"



** It is nothing of the sort - dickhead.

http://www.networkworld.com/community/?q=node/17268


The DOD details are here:

http://www.dod.mil/ddre/prize/rules_doc.html

Looks like a devious way to get a military grade, wearable *fuel cell*
battery pack designed and prototyped on the cheap.

Get the Chinese to mass produce them for $50 a pop later .





....... Phil

Server not found

Firefox can't find the server at www.dod.mil.


martin

 

[John B]

A PSU design challenge here

http://www.networkworld.com/community/?q=node/17268

maybe CircuitCellar could do it as a project


martin

Anyone who can squeeze 185kWHr capacity into 4kg deserves to win $1M.

 

[Don Bowey]

Server not found

Firefox can't find the server at www.dod.mil.


martin

Mine went right to it.

 

[martin griffith]

Mine went right to it.

I think Telefonica is blocked by some sites, loads of spam generators
used to use telefonica, but I got through using Tor, via germany,
eventually


martin

 

[Rich Grise]

A PSU design challenge here

http://www.networkworld.com/community/?q=node/17268

maybe CircuitCellar could do it as a project

They should just tote a little generator and snitch truck fuel. ;-)

Cheers!
Rich

 

[Paul Hovnanian P.E.]

A PSU design challenge here

http://www.networkworld.com/community/?q=node/17268

maybe CircuitCellar could do it as a project

martin

No problem at all. They don't state in the requirements if the subject
carrying the PSU is expected to survive acute radiation poisoning
following the 96 hour period.

 

[Paul Hovnanian P.E.]

No problem at all. They don't state in the requirements if the subject
carrying the PSU is expected to survive acute radiation poisoning
following the 96 hour period.

Never mind. I found the bit about 'no radio-isotopes'. Damn
spoil-sports.

The system energy density they want suggests either some really exotic
battery chemistries or a fuel cell plus a small recargable cell to
provide short term peaking power. They are looking at about 1.8E6
Joules/Kg for the system. Lithium-ion batteries (alone) run around 4E5
Joules/Kg if I'm not mistaken. I didn't see anything about noise. Just
rig up a little generator using a model airplane engine and some
rechargable batteries to ride through peak loads, submerged operation,
etc. The spec's didn't say the wearer had to be sane after the end of
the test either. ;-)

 

[Phil Allison]

"John B"

Anyone who can squeeze 185kWHr capacity into 4kg deserves to win $1M.

** The DOD spec is for 20 watts for 96 hours = 1.92 kWH.




........ Phil

 

[Winfield]

John B wote,


** The DOD spec is for 20 watts for 96 hours = 1.92 kWH.

Then they should win 1.92/185 * $1M = $10.4k bucks.

 

[John B]

"John B"




** The DOD spec is for 20 watts for 96 hours = 1.92 kWH.




....... Phil

Ah, Mea Culpa. I failed to look at the DoD spec and interpreted the
magazine article as 1920W/hr for 96 hours. A little bit different from
reality.

 

[Rich Grise]

Never mind. I found the bit about 'no radio-isotopes'. Damn
spoil-sports.

The system energy density they want suggests either some really exotic
battery chemistries or a fuel cell plus a small recargable cell to
provide short term peaking power. They are looking at about 1.8E6
Joules/Kg for the system. Lithium-ion batteries (alone) run around 4E5
Joules/Kg if I'm not mistaken. I didn't see anything about noise. Just
rig up a little generator using a model airplane engine and some
rechargable batteries to ride through peak loads, submerged operation,
etc. The spec's didn't say the wearer had to be sane after the end of
the test either. ;-)

And not only that, but with an engine, the load would get lighter as
fuel is burned. ISTR seeing a little Honda 1KW about the size of a
football, once.

Cheers!
Rich

 

[Paul Hovnanian P.E.]

And not only that, but with an engine, the load would get lighter as
fuel is burned. ISTR seeing a little Honda 1KW about the size of a
football, once.

Seriously, I gave the requirements a quick scan and didn't see anything
definite about the wearer's comfort. I don't seriously think anyone will
be proposing a reciprocating engine. But some fuel cell technologies can
get pretty warm in operation. The temperatures may not reach harmful
levels, but I don't want to lug a heating pad around the Iranian* desert
for 96 hours. In fact, one parameter of interest to the DoD seems to be
how thick the unit is, suggesting that this will be warn against a
soldier's body.

*Of course I'm kidding about this possibility. Bush will have us in Iran
long before this power pack is put into production.