/sci/ - Science & Math

>>6408157
>For a start, you need a high pressure tank.
yup
>The tanks are big.
yup
> This makes them rather expensive, and also fairly heavy.
It makes them expensive OR fairly heavy. Yah no matter what they are heaver than a non pressure liquid tank but they are sill lighter than a solid.

I'm thinking a big ass cng type tank, filament wound maybe around an aluminum core or maybe with just an impermeable plastic liner, this tech is not super expinsive these days they are even making water towers and shit, it's maybe 2-3x the cost of a steel structure built to the same pressure specs but ~1/4 the mass of steel. http://youtu.be/HPBmbkyi9Tw

>They do have to keep the tank pressurized as it is depleted.
Nope.xls
The top 1/5th of the tank or what ever you calculate is left unfilled, just before take off you charge it with helium. You'll end up with a nice thrust curve, maximum chamber pressure at take off and tapering down as the flight continues. This is actually desirable to maintain constant g loading. Pump fed engines often throttle down or on a multi engine configurations shut down some engines completely later in flight to get this. Solid rockets get cast into crazy ass shapes to make this kind of thrust curve.


So just two big tanks with fat pipes feeding into a combustion chamber, I'm sure we'd need pressure regulators maintain fuil/ox ratios and allow for cut off if desired and whatever. You can set them off ala ssme with pyrotechnics on the pad or add a couple extra nozzles fed with a small amount of hypergols for ignition, this would also allow restart if you wanted to do some crazy ass elon musk maneuver.

>>6211050
Would it be incorrect to say something like, let's say a rag soaked in alcohol is "wet" even though it contains no water?

>>5041542
LOL

Next time try explaining to sci why you think you have aspergers or are a benevolent sociopath. People here are like chickens that will pick to death any thing you think makes you different.

>stay assey /sci/

>>4988893
>Cancer is an irreversible condition of life, just like death.

Cancer is often caused by multiple genes misbehaving. You can turn genes on or off with out destroying the sells.
see https://www.google.com/search?q=epigenetic+cancer+treatments

>Integration using radians and irrational numbers
>Thinks a calculator is powerful enough to handle rounding on that scale
>TI89

Don't know if serious

Hey /sci/ i am strugglin at some calc 1. lets see if you guys can help some basic math.

Limit as X->0
(X^2) - sin^2(2x)/tan^2(3x)

in word form: limit as x approaches zero in X squared minus sine squared of 2x, all divided by tangent squared of 3x.

spent an hour being brain fucked, would like feedback.