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Old 8th October 2002, 02:55 AM   #11
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peranders,
That sounds like the formula for the rocket fuel they use on the shuttle!! dangerous stuff they say.

Here are some amazing facts about the SSME from the Rocketdyne/Boeing site"

Rocketdyne's Space Shuttle Main Engine operates at greater temperature extremes than any mechanical system in common use today. The liquid hydrogen fuel is -423 degrees Fahrenheit, the second coldest liquid on Earth. When the hydrogen is burned with liquid oxygen, the temperature in the engine's combustion chamber reaches +6000 degrees Fahrenheit - that's higher than the boiling point of Iron.

The maximum equivalent horsepower developed by the three SSMEs is just over 37 million horsepower.

The energy released by three of Rocketdyne's Space Shuttle Main engines is equivalent to the output of 23 Hoover Dams.

Although not much larger than an automobile engine, the SSME high-pressure fuel turbopump generates 100 horsepower for each pound of its weight, while an automobile engine generates about one-half horsepower for each pound of its weight.

Even though Rocketdyne's SSME weighs one-seventh as much as a locomotive engine, its high-pressure fuel pump alone delivers as much horsepower as 28 locomotives, while its high-pressure oxidizer pump delivers the equivalent horsepower for 11 more.

If water, instead of fuel, were pumped by the three Space Shuttle Main Engines, an average family-sized swimming pool could be drained in 25 seconds.

The SSME high-pressure fuel turbopump main shaft rotates at 37,000 rpm compared to about 3,000 rpm for an automobile operating at 60 mph.

The discharge pressure of an SSME high-pressure fuel turbopump could send a column of liquid hydrogen 36 miles in the air "

Now this would make one heck of a speedy echant machine!!!

Mark
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Old 8th October 2002, 05:16 AM   #12
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Quote:
Originally posted by till
Last weekend i made PCB for Zen V4, using 30% HCl and as much H2O2 as it begins to make bubbles, took about 2 min. i made it outdoors because of the gas coming out of the solution. No problems, very good PCB.
Of course you can skip the water but for a newbeginner, I think it's unsuitable. Be a little careful at first and then reduce the amount of water. Pure acid + H2O2 is like rocket fuel, very fast reaction, in fact you can etch a board within 15-30 seconds!
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Old 8th October 2002, 06:47 AM   #13
hifiZen is offline hifiZen  Canada
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Whoa... You must be <i>very</i> careful working with concentrated acid...

for safety, you must slowly add the acid TO the dilutant (water, H2O2) never vice-versa! This is especially important with concentrated acids, as they can get very hot very quickly, even boil explosivley, spraying you with concentrated acid!!!

Be careful fellas... full coverage goggles or face shield is a good idea, as is a chemical respirator, good ventilation, and first-aid supplies on hand, especially and eye-wash method of some sort. Chemicals, especially acids, are no joke... I used to work in materials engineering, and we had one bad accident and several close calls, even with all the safety equipment and procedures of a properly equipped and staffed lab...

Of course we worked with some serious stuff... Nitric acid, Hydro-Flouric Acid and a bunch of other metal etchants, mostly for preparing samples for microscopy. Still, HCl isn't friendly stuff.

I just to make sure all the newbies who read this understand the nature of this stuff!

I don't etch my own boards any more, but I recall being very frustrated with the painfully slow FeCl method. I would've jumped to try a high-speed etching technique with simple ingredients like this.

Anyway, I'm sure it works really well. Maybe if I decide to do my own boards again, I'll try it out.

Safe etching fellas...
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Old 8th October 2002, 12:35 PM   #14
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I wouldn't think of keeping hydrofluoric acid in the house. a couple years ago a sanit-man in NYC burned to death from someone's negligence placing the stuff in the trash. Hydrofluoric acid is used to etch glass, among other things. All t hese are nasty (how many of you audio DIY'rs have pH meters like me?)<p>found the following on the wwwwwwww:
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