Jeff Vader

artificer

[Jeff Vader @JeffVader10]

the only words that work on fascists

[wise political commentator (derogatory) @b_n_d_l_e]

a ~5x reduction in the suicide rate seems like actually extremely strong evidence that it works and saves lives?

[Neb | 🏳️‍🌈 @NebsGoodTakes]

elon abandoning his own son in public 4k gif

[Jeff Vader @JeffVader10]

@Robotbeat Yeah, insulation mass might be the kicker. You could squeeze out maybe another 0.5MJ/kg by letting the block get down to 1000K before shutting off propellant flow.

You could also skip the solar panels and go solar thermal.

[Jeff Vader @JeffVader10]

Had the idea this afternoon of using molten silicon (which has a ridiculously high enthalpy of fusion - 1.8 MJ/kg) as a thermal battery for a resistojet-esque thruster, so you can do impulsive manoeuvres on diddy power supplies. Looks like it could work

[Jeff Vader @JeffVader10]

you could use Li-ion batteries instead, but the energy they can store per kg is about half that of molten silicon (not including any additional structure or insulation, so it may be more competitive than that). 3/3

[Jeff Vader @JeffVader10]

not a new concept - there's similar schemes for grid energy storage.

Higher thrust is good as you spend less time fighting gravity. But electric thrusters are limited by the available power. Here, the peak power can be 100x the average for just a little bit of added mass 2/

[Jeff Vader @JeffVader10]

fucking mental flight

[Jeff Vader @JeffVader10]

https://t.co/XOqQUJAJr3

[Jeff Vader @JeffVader10]

angry snails make the rockets go

[Jeff Vader @JeffVader10]

me omw back to uni in 5 months with all the biprops I'm building in secret

[Jeff Vader @JeffVader10]

Integrated heat sims! I should do topology optimisation on this

[Jeff Vader @JeffVader10]

still a ways off from being finished

[Jeff Vader @JeffVader10]

@Robotbeat makes things so much easier, expensive though🥲

[Jeff Vader @JeffVader10]

(whoops, there were some axis issues)

[Jeff Vader @JeffVader10]

give me some 3 part propellant combos to try out

[Jeff Vader @JeffVader10]

@Bobby_Corwin

[Jeff Vader @JeffVader10]

@hungrytacos15 Interesting. I wonder what they're mixing it with because straight nitromethane burns itself so well it hardly seems worth adding an oxidizer.

[Jeff Vader @JeffVader10]

investigating magnesium + nitromethane monopropellants when I really have other things to be doing

[Jeff Vader @JeffVader10]

@ZhanPoasts sadly not, (RocketCEA gets very cross when you have condensed products in the exhaust which is why it drops to zero as you increase the weight %)