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Comic 1467 - Go For Hop

24th Feb 2017, 12:00 AM
Go For Hop
Average Rating: 5 (9 votes)
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Comments:

jamie59 24th Feb 2017, 12:13 AM edit delete reply

245% -300% I can understand a 20% -30% safety margin but 200% WTF!
Stormwind13 24th Feb 2017, 12:24 AM edit delete reply

A lot of craft have a lot of reserve, jamie; however, using that reserve will reduce the life of the engine drastically. I've never seen someone push the engine THAT much though. I wonder if Ada will be in glider mode when she lands in New Troy!
megados 24th Feb 2017, 12:30 AM edit delete reply
I don't think she will keep that power level, once they reach terminal velocity. I think it is just for acceleration, and increasing altitude.
robnot 24th Feb 2017, 2:23 AM edit delete reply
only one uses that reserve ,

TOP FUEL ACCELERATION PUT INTO PERSPECTIVE

* One Top Fuel dragster 500 cubic-inch Hemi engine makes more horsepower (8,000 HP) than the first 4 rows at the Daytona 500.

* Under full throttle, a dragster engine consumes 11.2 gallons of nitro methane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.

* A stock Dodge Hemi V8 engine cannot produce enough power to merely drive the dragster's supercharger.

* With 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition. Cylinders run on the verge of hydraulic lock at full throttle.

* At the stoichiometric 1.7:1 air/fuel mixture for nitro methane the flame front temperature measures 7050 degrees F.

* Nitromethane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.

* Dual magnetos supply 44 amps to each spark plug.
This is the output of an arc welder in each cylinder.

* Spark plug electrodes are totally consumed during a pass. After 1/2 way, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees F. The engine can only be shut down by cutting the fuel flow.

* If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.

* Dragsters reach over 300 MPH before you have completed reading this sentence.

* In order to exceed 300 MPH in 4.5 seconds, dragsters must accelerate an average of over 4 G's. In order to reach 200 MPH well before half-track, the launch acce leration approaches 8 G's.

* Top Fuel engines turn approximately 540 revolutions from light to light!

* Including the burnout, the engine must only survive 900 revolutions under load.

* The redline is actually quite high at 9500 RPM.

* THE BOTTOM LINE: Assuming all the equipment is paid off, the crew worked for free, & for once, NOTHING BLOWS UP, each run costs an estimated $1,000 per second.

0 to 100 MPH in .8 seconds (the first 60 feet of the run)
0 to 200 MPH in 2.2 seconds (the first 350 feet of the run)
6 g-forces at the starting line (nothing accelerates faster on land)
6 negative g-forces upon deployment of twin ‘chutes at 300 MPH An NHRA Top Fuel Dragster accelerates quicker than any other land vehicle on earth . . quicker than a jet fighter plane . . . quicker than the space shuttle.

The current Top Fuel dragster elapsed time record is 4.420 seconds for the quarter-mile (2004, Doug Kalitta). The top speed record is 337.58 MPH as measured over the last 66' of the run (2005, Tony Schumacher).

Putting this all into perspective:

You are driving the average $140,000 Lingenfelter twin-turbo powered Corvette Z06. Over a mile up the road, a Top Fuel dragster is staged & ready to launch down a quarter-mile strip as you pass. You have the advantage of a flying start. You run the 'Vette hard up through the gears and blast across the starting line & pass the dragster at an honest 200 MPH. The 'tree' goes green for both of you at that moment.

The dragster launches & starts after you. You keep your foot down hard, but you hear an incredibly brutal whine that sears your eardrums & within 3 seconds the dragster catches & passes you.
He beats you to the finish line, a quarter-mile away from where you just passed him. Think about it - from a standing start, the dragster had spotted you 200 MPH & not only cau ght, but nearly blasted you off the road when he passed you within a mere 1320 foot long race!

That's acceleration!

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sorry for wall o text
Centcomm 24th Feb 2017, 12:36 AM edit delete reply

Most craft use mass reduction tech. and if a engine can do say 100% once the mass has been reduced the thrust remains constant. SO shes doing .. Over 100% the math is math. Sorry.
it makes no sense. maybe?
megados 24th Feb 2017, 12:42 AM edit delete reply
Okay, if I understand correctly, then the mass reduction is going to augment engine output. Does that factor into the 300% or add to it?
All the Pickles 24th Feb 2017, 12:47 AM edit delete reply

The way I understand it the percentage is basically thrust to mass ratio, so it can be increased by either increasing thrust or decreasing mass.
megados 24th Feb 2017, 12:53 AM edit delete reply
Okay, so the 300% is the additive effect of both the reduction of mass and engine performance. So it's 300% craft overall performance? It makes sense then.
Centcomm 24th Feb 2017, 1:02 AM edit delete reply

yes Mega you got it. and she is FLOORING it.
robnot 24th Feb 2017, 2:06 AM edit delete reply
sooo? we are using 2 formulas,, E = mc 2 and tl = mc^2 ,, the second is Tesla's ..
which "basically " says .. with no mass ( anti-gravity ) the more Energy used the faster you go , but with % is exponential damage to engine..
Centcomm 24th Feb 2017, 2:34 AM edit delete reply

i .. think? Cringes from the math.
megados 24th Feb 2017, 12:19 AM edit delete reply
Ada, Noctis, keep Acantha safe.
Swift travels!
Time is of the essence!

The view in the last panel is amazing!
Centcomm 24th Feb 2017, 12:35 AM edit delete reply

thanky thanky!
Stormwind13 24th Feb 2017, 12:20 AM edit delete reply

Ada is sure hoping that CentComm will reimburse Kyle for her abuse of the Dart. After trying to charge a ('dead') TeeDee for shooting her doll, I'm not as optimistic as Ada about that.
All the Pickles 24th Feb 2017, 12:26 AM edit delete reply

That was senseless vandalism though; this is an operational expense.
Centcomm 24th Feb 2017, 12:35 AM edit delete reply

Oh Ada is going to almost wreck this poor thing.
Gilrandir 24th Feb 2017, 12:49 AM edit delete reply
Theoretically, the ambulance bill should go to the House of Livius, not New Troy. I'm sure Acantha has health insurance, though. ^_^

If she turns out to be underinsured, then the New Troy taxpayers end up getting stuck with the bill.
megados 24th Feb 2017, 12:59 AM edit delete reply
Maybe Kyle just ends up with a fried engine and an apology . . .
Gilrandir 24th Feb 2017, 1:18 AM edit delete reply
Then Kyle's insurance gets involved, and sues New Troy S&R for improper seizure of assets, seeking to recover payment for the stolen vehicle. ^_^
HiFranc 24th Feb 2017, 1:26 AM edit delete reply

Then New Troy just says "National Security". However, I believe that Rose will reimburse him and will add it to CentComm's tab.
Gilrandir 24th Feb 2017, 1:38 AM edit delete reply
Don't know about New Troy laws (by the way, Kyle is a resident of New Sparta, not New Troy) but seizure under eminent domain per American law does not relieve the government from the obligation to provide equitable restitution. They would have had to declare a state of emergency (in advance) and jump through all sorts of legal hoops before they could just help themselves to anything they want without needing to pay for it after the fact. And, considering it was seized in Nova Roma, not New Troy, that's a case it seems it would be stupid easy for a lawyer to win.

You'd have better luck if Nova Roma (which {probably} did have a state of emergency declared) seized the Dart, then handed the keys to Ada. Of course, that's technically an act of war against New Sparta, unless they play nice and pay up after the fact.

Why do so many people seem to think it so much cooler if people don't just pay what they owe? Livius wants Acantha saved. Livius is filthy rich. Livius should pay what they owe. No problem.
All the Pickles 24th Feb 2017, 12:24 AM edit delete reply

Minor nitpick: that would be a suborbital hop unless they're actually going into an orbital trajectory then deorbiting later. That would be far less efficient than a parabolic trajectory, especially for such a short trip.

Aside from that, great page!
Centcomm 24th Feb 2017, 12:34 AM edit delete reply

They are doing a parabolic arc. the distance is just right to be faster than a orbital insertion. they Are however going above the stratosphere and high into low orbit .. you will see.
All the Pickles 24th Feb 2017, 12:44 AM edit delete reply

Right, but suborbital refers to the trajectory, not the altitude.
Gilrandir 24th Feb 2017, 12:59 AM edit delete reply
Actually, @All the Pickles, I will call your attention to the third paragraph of your cited reference:

"
Flights which attain sufficient velocity to go into low Earth orbit, and then de-orbit before completing their first full orbit, are not considered sub-orbital. Examples of this include Yuri Gagarin's Vostok 1, and flights of the Fractional Orbital Bombardment System.
"

So, if Ada gets it going fast enough to achieve stable orbit, then de-orbits, it apparently would not be considered "suborbital". It would appear, from @Centcomm's statements, that that is what is happening. I expect that, from a fuel-consumption standpoint it would be considerably less efficient; but from an elapsed time standpoint (assuming unlimited fuel) it is probably superior to have the Dart under acceleration for the entire trip duration -- either speeding up or slowing down, with no time at all spent coasting. Given that flight profile, there would almost certainly have to be at least one transitory moment during which the Dart possessed an orbital vector.
Centcomm 24th Feb 2017, 1:01 AM edit delete reply

Yes Gil thats why permission was needed from Luna gov to allow her to fly in there " 'air'Space? "
Gilrandir 24th Feb 2017, 1:09 AM edit delete reply
No @Centcomm. @All the Pickles has it right there. Altitude is irrelevant to whether the proper adjective is 'orbital' or 'suborbital'. I agree that Luna would care based on how high they are going, but (as best this uneducated layman understands and can express it) if there is a single instant of flight during which, if you shut the engines off, the ship would go into orbit and stay there, then it is an 'orbital' flight, otherwise it is 'suborbital'. There are plenty of trajectories that could take you out to Geosynchronous orbit and still be 'suborbital' -- presuming you had unlimited fuel.
All the Pickles 24th Feb 2017, 1:07 AM edit delete reply

Ok, fair enough. That was covered in my initial comment though the terminology might have been a little different. While it's not the most efficient way to make such a hop, it is the fastest if the craft has the fuel to keep accelerating past the point where gravity would complete the arc, then decelerate to avoid overshooting the target.
Gilrandir 24th Feb 2017, 1:16 AM edit delete reply
Yes, @All the Pickles. And, although I don't know this to be true, given the sort of unlimited fuel flight profile we are talking, I'm pretty sure the flight profile ends up looking nothing like a parabola at all. Parabolic trajectories typically emerge when gravity is doing most of the work, and in that case, we should definitely be talking 'suborbital'.
Mark_L_A 24th Feb 2017, 1:03 AM edit delete reply

And Noctis is just filing away that Kyle evident;y is skilled enough to reprogram his Dart's Vox in addition to all the work he assumedly did in the restoration of Aeneas, plus getting through Roma's security in the first place.

I wonder if she might recommend to Maxus to hire Kyle for the Roma IT department. And possibly Ada for the Roma Medical establishment.
HiFranc 24th Feb 2017, 1:28 AM edit delete reply

Does Lynn know about the Voice? If yes, how does she feel about it?

On one hand it might be seen as romantic. On the other, the computer has to do everything it's told (with the implications of that).
Gilrandir 24th Feb 2017, 3:45 AM edit delete reply
So, I take it we can conclude from the fact that Acantha appears to be sitting in Noctis' lap that in ordinary circumstances the Dart is a two-seat craft?
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