To build a death ray...

[DrGoogfan]

I was thinking about [just thinking, no money to build it] of a laser "death ray". one could put the tube inside a pvc gun type thing, have a cooling water sack on their back, and have 12v lipo batteries with a 120v inverter in there too. a portable co2 laser "death ray".



http://i50.tinypic.com/28aryj7.jpg

Think ghostbusters

http://i46.tinypic.com/15x21l1.jpg

[DrGoogfan]

jesus i expected zoklet to be all over this by now.

[Infernus]

hey dude, no.

Nice idea, but very, unpractical, see, a co2 laser draws at least 15kv or so at 20 ma
or a solid 300 watts, thats not even taking into account the lossiness of your idea of taking it to 120, then to 15 kv.

so for a lipo battery at 12v youd be drawing about 25 amps wow, thats alot, and thats not even including peak voltage draw, youd need 30 amps @ 12 v to be safe, that'd cover your pump and laser.

Now, Im not even going to go into the fact that the draw increases or can increase alot if you use a higher wattage laser, or the fact that your heat dissipation system leaves alot to be desired, if it, the water rises steadily at one degree celsius per minute (easily could do this, without more heat dissipation techniques) then youd literally fry your laser. since the hotter it is, the harder its going to be to cool your laser.

Now, suppose you managed to get this working, at say...

a 100 watt discharge with a straight 300 watt draw (between the cooling and the fact that lasers of all types litterally throw energy away, its possible)
or even a conservative 200 watt draw. How long will the batteries last? I see a lipo here thats rated for 11.1v at 8500mah so itd empty out in just under 45 minutes.

lets add more, oh wait, thats more weight, pun intended.

speaking of weight, 1.5 gallons of water, lets say ten pounds of pump, batteries, and tubing/wiring, and a tube weighing a conservative 10 pounds as well, glass, tubing, optics, pvc.

thats a whopping 32 pounds

a 100 watt laser can cut metal, sure, but even then, thats an expensive, heavy, not reliable weapon.

Ive seen chinese tubes crap out after 9 hours of laser'ing.

Now, you could use a Q switch to build up power of some time, then youd pucn ht through damn near anything,. but your still limmitied by one thing, batteries, heat, and weight, oh and the gases.

[DrGoogfan]

hey dude, no.

Nice idea, but very, unpractical, see, a co2 laser draws at least 15kv or so at 20 ma
or a solid 300 watts, thats not even taking into account the lossiness of your idea of taking it to 120, then to 15 kv.

so for a lipo battery at 12v youd be drawing about 25 amps wow, thats alot, and thats not even including peak voltage draw, youd need 30 amps @ 12 v to be safe, that'd cover your pump and laser.

Now, Im not even going to go into the fact that the draw increases or can increase alot if you use a higher wattage laser, or the fact that your heat dissipation system leaves alot to be desired, if it, the water rises steadily at one degree celsius per minute (easily could do this, without more heat dissipation techniques) then youd literally fry your laser. since the hotter it is, the harder its going to be to cool your laser.

Now, suppose you managed to get this working, at say...

a 100 watt discharge with a straight 300 watt draw (between the cooling and the fact that lasers of all types litterally throw energy away, its possible)
or even a conservative 200 watt draw. How long will the batteries last? I see a lipo here thats rated for 11.1v at 8500mah so itd empty out in just under 45 minutes.

lets add more, oh wait, thats more weight, pun intended.

speaking of weight, 1.5 gallons of water, lets say ten pounds of pump, batteries, and tubing/wiring, and a tube weighing a conservative 10 pounds as well, glass, tubing, optics, pvc.

thats a whopping 32 pounds

a 100 watt laser can cut metal, sure, but even then, thats an expensive, heavy, not reliable weapon.

Ive seen chinese tubes crap out after 9 hours of laser'ing.

Now, you could use a Q switch to build up power of some time, then youd pucn ht through damn near anything,. but your still limmitied by one thing, batteries, heat, and weight, oh and the gases.

1. To address your first point... They have lipo cells now that 50 amps can be drawn from (http://www.google.com/products/catalog?hl=en&source=hp&q=50c+lipo&oq=&um=1&ie=UTF-8&cid=13543630486694886898&ei=rMSES5CBGNS0tgexseD2Ag&sa=X&oi=product_catalog_result&ct=result&resnum=4&ved=0CBkQ8wIwAw#ps-sellers)continuously.
2. 45minutes is alot of runtime, It would be more of an intermittent use thing.
3. I woud never buy chinese tubes. I wasnt planning 100w, the tube would be ridiculously long to carry.
4. mabe i could. I wasnt planning on using this thing inside so gasses wont be a problem. Heat will be stored in the tank, 1.5g has pretty good thermal mass. fans will also be used on the tube.

also, 35 lbs is nothing.

I dont plan on building this soon, because i am saving up for a viasho 1w green. I wil make a laser harp from that. This will be my next project when the harp is finished, so maybe next year or 2012.

Also, you are a pretty good poster. I assumed you were just some mud farmer coming here to tell me off. You gained my respect, and therefore, you get a thanks.

[Infernus]

hmm, compared to the 7-8 pounds of an ak-47, 30ish is alot, plus a shot to the back could cripple the whole thing.

as for the batteries, i suppose i wreote those off because thats very expensive, im assuming youll find them cheaper, and that theres more than what that page divulges, since 5000mah is only 5a an hour.

lol good, chinese tubes are cheap, both in price and built, but us ones are sometime 4x as much money, your right in that 100w would be way to longfor a gun, but 50w-ish is kinda weak, i think youd have to use Q-switches

and by gasses i meant that the co2 laser uses up the gases (well obviously, right) and although manufacturers quote X hours, it can be alot less if something so much as wacks it the wrong way, so il lassume the pvc would be filled with a malleable shock absorber to endure large fallsn dont pwn your gun.

Might i suggest using a thermal energy converter to use the heat from the water to help charge the battery a bit? lose some ofthe heat, and maybe bumpp the lifespan up a bit, win win

also, thanks for the thanks :)

[DrGoogfan]

hmm, compared to the 7-8 pounds of an ak-47, 30ish is alot, plus a shot to the back could cripple the whole thing.

as for the batteries, i suppose i wreote those off because thats very expensive, im assuming youll find them cheaper, and that theres more than what that page divulges, since 5000mah is only 5a an hour.

lol good, chinese tubes are cheap, both in price and built, but us ones are sometime 4x as much money, your right in that 100w would be way to longfor a gun, but 50w-ish is kinda weak, i think youd have to use Q-switches

and by gasses i meant that the co2 laser uses up the gases (well obviously, right) and although manufacturers quote X hours, it can be alot less if something so much as wacks it the wrong way, so il lassume the pvc would be filled with a malleable shock absorber to endure large fallsn dont pwn your gun.

Might i suggest using a thermal energy converter to use the heat from the water to help charge the battery a bit? lose some ofthe heat, and maybe bumpp the lifespan up a bit, win win

also, thanks for the thanks :)

i could use a peltier, but it isn't worth it. tec's typically are about 1-3% efficient. even less so whe used in reverse. also, this will be more for fun and coolness factor, dont compare it to an ak.

[Archetype]

Since this is only a hypothetical design, you could include nanowire batteries instead of the Lipo stack, they offer nearly 10x more energy density and will be commercially available within 15 years.

[DrGoogfan]

Since this is only a hypothetical design, you could include nanowire batteries instead of the Lipo stack, they offer nearly 10x more energy density and will be commercially available within 15 years.

This will be built in 2012 though.

[Archetype]

This will be built in 2012 though.

Then you'll have to be happy with an unwieldy 60kg box on your back and a laser that only works for an hour and burns your hands in the process. :)