Comments on: You Have Discovered Rocketry.

By: Hentzau

Hentzau — Mon, 11 Aug 2014 18:36:54 +0000

That’s almost certainly a typo where I forgot to take dm(V(t) – U) out of the brackets correctly, although it’s been two years since I did this and I would need to check more thoroughly to make sure. Impressed that you’re cracking your way through it, though.

By: Yann

Yann — Sun, 10 Aug 2014 09:47:55 +0000

I’m probably just too green at calculus, but I really didn’t get that part.

By: Yann

Yann — Sat, 09 Aug 2014 15:11:45 +0000

Hang up; shouldn’t the velocity of the fuel at t+dt be “d mV(t) – d mU “, not “d mV(t) – U”? If not, then why does the equation in the picture subtract d mU?

By: » The Journey Is More Interesting Than The Destination. The Scientific Gamer

Mon, 13 Aug 2012 19:28:03 +0000

[...] somewhere fast revolve on three things I’ve talked about on here before: delta-v costs, the exponential fuel requirements of rocket staging, and Hohmann transfer orbits, which all combine into one unholy Megazord of making space travel as [...]

By: To Vee Or Not To Vee. « The Scientific Gamer

To Vee Or Not To Vee. « The Scientific Gamer — Mon, 06 Aug 2012 11:02:52 +0000

[...] a key restriction on travelling around the solar system that I’ve brought up more than a few times before on here: by far the hardest part of space travel is getting out of the Earth’s gravity [...]

By: The Future Of Spaceflight « The Scientific Gamer

The Future Of Spaceflight « The Scientific Gamer — Thu, 15 Mar 2012 10:01:36 +0000

[...] suck. This is a thing that we have established here; they’re terrifically awful ways of getting into space that are only used because nobody has [...]

By: innokenti

innokenti — Thu, 01 Mar 2012 19:09:12 +0000

Rockets are awesomely awful. When are we getting better things Hentzau? When?

By: Josher

Josher — Thu, 01 Mar 2012 11:30:42 +0000

Yes. But I kind of knew about that already.

By: hentzau

hentzau — Thu, 01 Mar 2012 10:29:57 +0000

Did you at least understand the bit about staging.

By: aosher

aosher — Thu, 01 Mar 2012 10:21:37 +0000

Mlaaaaaa.