[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 419 KB, 1800x1416, Boeing_B-47B_rocket-assisted_take_off_on_April_15_1954_061024-F-1234S-011.jpg [View same] [iqdb] [saucenao] [google]
2884885 No.2884885 [Reply] [Original]

Is there any equation that shows how much fuel is required to move a rocket into space considering the weight of the extra fuel?

Like, if I assumed an initial mass of x, how can I work out how much fuel it will take with a thrust of y, but also taking in consideration that more fuel will increase mass?

English is not my first language so it may not sound be very clear.

>> No.2884892

It would depend on the type of fuel.

>> No.2884910

Whatever type of fuel the Atlantis uses
http://en.wikipedia.org/wiki/Space_Shuttle_Atlantis

>> No.2884914

>>2884892
Not an aero engie here, but wouldn't the type of fuel just alter the variables of the equation and not the equation itself?

>> No.2884971

bump

>> No.2885404
File: 51 KB, 800x529, 800px-Rocket_mass_ratio_versus_delta-v.png [View same] [iqdb] [saucenao] [google]
2885404

http://devilfinder.com/find.php?q=rocket+equation
http://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

>> No.2885441

>>2884914

also depends on the energy potential of the fuel too - might mean requiring a larger mass of fuel, meaning a bigger tank, so even more weight, drag etc. but thats not something any simple calculator will sort out for you

>> No.2885561

make a differential equation that includes the derivative of fuel mass as a factor.

>> No.2885818
File: 2 KB, 126x112, BattleToads at the dentist.jpg [View same] [iqdb] [saucenao] [google]
2885818

>>2885404
>Search engine other than Google

Wut?

>> No.2885839

do you just want to get into orbit or escape earths gravity compleatly?

>> No.2886545

>>2885818
>Wut?

sure, no commercial propaganda, no tracking (direct links), relevant results on one page (else modify search string).

>> No.2886614

>>2886545

Interesting. But https://ixquick.com/ eliminates google scum completely

>> No.2886639
File: 21 KB, 710x531, rktpow.gif [View same] [iqdb] [saucenao] [google]
2886639

The Rocket Equation is what you are looking for. Initial mass by end mass (payload), figured through the ISP of your propellant tells you pretty much everything you need to know about a rocket. ISP is how many seconds of impulse you get from a pound (unit, it works with kilograms too) of propellant.

Things that greatly affect rocket performance: chamber pressure, ISP, mass-fraction (propellant to structure), MaxQ (dynamic pressure) and gravity losses.

Not a maths guy, here's a NASA graphic.

>> No.2886959
File: 21 KB, 527x305, ixquick.png [View same] [iqdb] [saucenao] [google]
2886959

>>2886614
>ixquick

I sometimes use the non-ssl version of ixquick called startpage.com but I really prefer the one page approach of devilfinder.

>>2886639

That's a useful pic, here's the calculator: http://www.quantumg.net/rocketeq.html

>> No.2889287

>ITT: Faggots caring over some ads and other pointless shit

It's just a search engine you idiots.