Posts by John Smith 19

Irony alert: politicians attack facebook ...

Indeed.

Senator Feinstein banging on about FB was a "Are you f**king kidding me?" moment.

And let's be clear, she favours slurping up everyone's data in the US (and frankly anyone they connect to world wide).

No choice. No exceptions.

Would that make her a "Demoncrat In Name Only" or "DINO"?

Re: ground test

That's called a "Pulse jet."

It's not anywhere close to SABRE's cycle.

One of the key design drivers for SABRE was that it must generate thrust from 0 Km/h.

No catapults (which the V1 used). No sleds. No high pressure gas injection.

BTW A pulse jets thermal efficiency is pretty poor. IOW it's fuel consumption is quite high.

"but you've cut the oxidant load by at least 20%."

REL estimate that an all rocket Skylon would carry 100 tonnes more LOX (it's already carrying about 160 tonnes)

Basically that shifts the whole balance.

Too much weight, too little Isp --> mandatory feather weight structures --> impossible to make orbit.

Again it's not just "Not carrying the O2" it's Isp==3000secs. not 380sec (the SSME at takeoff)

It's an old cliche that "The rocket equation is steep." That high Isp lasts long enough to make all the difference

Getting to Mach 5 is 20% of the way to orbital speed.

Wow, you're powers of observation are astounding.

Actually it's more like 21% but what you've missed is that during that period it's average Isp is 6.6x that of the best available viable rocket propellant (not the classic but unworkable LH2/LF2/Lithium)

In addition to the oxidizer coming from the air its also pushing the other 80% inert reaction mass out the back IE the N2. And in this game more mass --> more momentum.

That Isp buys you the luxury of not needing paper thin tank walls (which is what VTOL SSTO usually comes down to) and the wings handle most of the gravity losses since the vehicle is always more or less horizontal from takeoff.

So you get a design that a) Needs tough but within the SoA structural fractions (not unobtanium) b) Robust to survive multiple uses from full reentry with full payload (which killed the idea of a reusable F9 US) and c) Does so with a payload fraction like that of a normal TSTO ELV, historically impossible for VTOL SSTO's, and more so for rocket only HTOL vehicles.

"Gyroscope = reaction wheels or control moment gyroscopes, "

With you now.

That's a whole different thing.

I prefer the idea of CMG's. Once spun up they need relatively little power to keep spinning and low power to alter the axis of rotation.

One thing I've not seen explored is the idea of a dense fluid in a circular pipe, perhaps with some inert gas, so you form lumps of it. I'm thinking of a low melting point alloy to make it conductive with say Tungsten beads to make up the weight.

"The basic system is a case management imaging and workflow system. "

Citizen.

You are clearly in possession of state secrets relating to State computer systems you are not authorized to work on.

Sit still and await for authorized personnel to collect you for interrogation.

<signed>

Big Brother.

Very happy that we are allowed to exist without needing the permission to do so.

Hilarious, given that people who voted Leave are most of the reason this is necessary in the first place.

Re: Is there a "no Brexit" clause ?

Of course not.

<gollum>

We wants it

We needs it

We must have hard Brexit at all costs.

</gollum>

Hmm. I wonder how difficult a video would be to gradually morph Gollum into Jackob Rees Mogg?

FARTS? Nooooo. But

Foreigner Application Reporting And GPS Enablement.

FARAGE

"..perilously close to making the environment *not* hostile to immigrants."

Calm yourself citizen.

As a recognized "Centre for Evil" in the UK the Home Office is working tirelessly to ensure that will not be the case.

App defaults will be chosen to be as inconvenient as possible.

Error correction after entry will be almost impossible to carry out.

Multiple fields will be inexplicably interlocked with out proven "Kafkaesque maze" technology.

And of course the app will follow SOP for all phone apps and demand full access to your address book and email, GPS and IP address.

<signed>

The Home Office.

We take evil seriously.

"Sex trafficking is an abomination, a blight on Humanity as a whole. T"

TOTC.

As always.

And as always this will be expanded to fit the wants of whatever group of cops wants to do whatever it is they want to do this week.

"Something *must* be done about this <insert heinous crime here>"

The basis of all badly written and ill thought out laws.

The traditional spacefaring approach..grow fresh food,

In an SF novel, maybe

IRL the only biological thing being recycled in the ISS is the 'naughts urine and sweat.

Everything else is either dried and sent back to Earth for analysis or dumped in a capsule and burned in reetnry.

There have been experiments to grow food on the ISS. None have AFAIK used human waste.

You are literally spouting bu***hit.