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Ghost Rider Compesators

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Ghost Rider Compesators
Post by Lord Skimper   » Fri Jul 08, 2016 6:46 am

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Why aren't ghost rider compensators used on ships?
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Re: Ghost Rider Compesators
Post by Duckk   » Fri Jul 08, 2016 6:51 am

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...What? There's no such thing as a "Ghost Rider compensator".
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Re: Ghost Rider Compesators
Post by Somtaaw   » Fri Jul 08, 2016 8:10 am

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I'm not sure if this is a bad thing, or a good thing I might actually be learning to "speak" Skimper level of stupid...


but I think his twisted mind has fixated on how fast Ghost Rider drones can accelerate and wants to know why ships don't go that fast. Ignoring the minor fact that Ghost Rider drones either aren't compensated at all, or compensated very very little to allow them acceleration in the thousands rather than the hundreds ships can handle.
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Re: Ghost Rider Compesators
Post by Weird Harold   » Fri Jul 08, 2016 12:37 pm

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Somtaaw wrote:I'm not sure if this is a bad thing, or a good thing I might actually be learning to "speak" Skimper level of stupid...


but I think his twisted mind has fixated on how fast Ghost Rider drones can accelerate and wants to know why ships don't go that fast. Ignoring the minor fact that Ghost Rider drones either aren't compensated at all, or compensated very very little to allow them acceleration in the thousands rather than the hundreds ships can handle.


Not to mention the smaller the volume compensated for inertia, the higher the acceleration. Also, the greater the ratio of compensated volume to available "gravity sink" (i.e. the wedge) the higher the permissible acceleration.

If a ship and a drone have the same compensator technology, the drone is going to be faster by at least an order of magnitude -- or two.
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Re: Ghost Rider Compesators
Post by Jonathan_S   » Fri Jul 08, 2016 2:17 pm

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Weird Harold wrote:Not to mention the smaller the volume compensated for inertia, the higher the acceleration. Also, the greater the ratio of compensated volume to available "gravity sink" (i.e. the wedge) the higher the permissible acceleration.

If a ship and a drone have the same compensator technology, the drone is going to be faster by at least an order of magnitude -- or two.
Well almost certainly not two, drones are quick compared to ships, but they're not 50,000+g quick. One order of magnitude quicker (~5,000g) is about what they can do.


(warning, pointless and semi-lengthy side tangent)
Though the current mass / acceleration curves (to the extent that David has publicly shared details of them or data points along them) don't yet show that.
There would need to be one or two additional sharp inflection points as you got into very low masses.

The table from More Than Honor has the lowest category as being "0-79,999 tons" and 550g. (And my line fitting attempts seem to show that the acceleration listed in that table is for the low end of each mass range. In this case that a theoretical 0 ton ship could have done 550g with old-style compensators). Also best guess in that new compensators are mostly a straight percentage improvement, so that 0 ton ship would now (with some of the best performance seen, 155% of old-style) be good for 852g - still far short of what we've seen drones do.
But since manned starships aren't that small there's no pressing reason for David to share (or even develop) a cohesive mass/accel curve for such tiny (<10,000 ton) masses.
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Re: Ghost Rider Compesators
Post by Somtaaw   » Fri Jul 08, 2016 8:07 pm

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Ok, so unless anyone has a better (or more specific datum anyways), I've found a few passages in Shadow of Freedom regarding Ghost Rider drones.

“CIC makes it thirteen sources, Sir,” the lieutenant reported after a moment, and Hammond felt his muscles tighten. “They’re half a light-minute outside the hyper limit,” Garrett continued. “That puts them at a range of two-one-five-point-nine million klicks. Current closing velocity niner-one-three KPS. Acceleration five-point-seven KPS squared.”
-snip-
“Yes, Sir.” Hammond wasn’t looking—or feeling—any happier. “They’re up to a closing velocity of just under four thousand KPS. GG”—he nodded at Garrett—“makes it three hours and fourteen minutes to a zero/zero intercept with the planet…and us, of course. Turnover in about an hour and a half. Velocity at turnover will be right on thirty-five thousand KPS.”
-snip-
“How much longer for the platforms to give us a good look at the planetary orbitals, Stilt?” he asked.
“Not long, Sir,” his operations officer replied. “They’re only about ninety-six light-seconds from Mobius Beta, now. In fact, if there’s anything in orbit with active impellers, it’s got to be on the far side of the planet from us at the moment, or we’d already have picked it up.”
“Good.”
Terekhov tipped back in his command chair, gazing at the master plot. Quentin Saint-James had reentered normal-space twenty-six minutes earlier. During that time, she’d increased her n-space velocity to just over ninety-four hundred kilometers per second and traveled just under 7.8 million kilometers towards the planet officially designated Mobius Beta. During that same interval, the Ghost Rider recon platforms they’d deployed as soon as they’d made their alpha translation had traveled ten and a half light-minutes—almost 200 million kilometers—at their vastly higher acceleration. In fact, they were already decelerating towards a zero/zero rendezvous with the planet.



So the, more or less latest, Ghost Rider drones travelled almost 200 million kilometers in just under 24 minutes, and were down to under 96 light-seconds from Mobius. I'm sure exactly how fast that makes a Ghost Rider drone, but Sag-C's had a speed of 730 grav's, and the drones did the trip something like 10 times faster than the ships could have, and did it without detection. Rough mass on Ghost Rider drones has to be around the same for capital MDM's at the top end, so a max of 1000 tons or so, compared to the Saganami's 483 ktons.


Now totally excluding the minor issue, that I think David already said small one-man "snubfighters" ala Star Wars aren't possible, 1000 tons could make for one helluva fighter, that could pull even more acceleration than even LAC's or pinnaces, but still less than that of Ghost Rider drones.... if you ignore David saying no anyways, which Skimper seems to have problems with.

But out of curiosity, what is the acceleration those Ghost Rider drones pulled at Mobius?
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Re: Ghost Rider Compesators
Post by kzt   » Fri Jul 08, 2016 8:14 pm

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IIRC, they can do about 10,000g. They might be running without a compensator, just directly handing the acceleration. Don't know.
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Re: Ghost Rider Compesators
Post by Weird Harold   » Fri Jul 08, 2016 9:08 pm

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kzt wrote:IIRC, they can do about 10,000g. They might be running without a compensator, just directly handing the acceleration. Don't know.


I've forgotten.

What happens if you exceed a compensator's top acceleration? Other than compensator failure, that is. Is failure the only option if you accelerate at 101% of your compensator's capacity?
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Re: Ghost Rider Compesators
Post by kzt   » Fri Jul 08, 2016 9:46 pm

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Weird Harold wrote:
kzt wrote:IIRC, they can do about 10,000g. They might be running without a compensator, just directly handing the acceleration. Don't know.


I've forgotten.

What happens if you exceed a compensator's top acceleration? Other than compensator failure, that is. Is failure the only option if you accelerate at 101% of your compensator's capacity?

You get instantaneously exposed to the full acceleration. In the Honorverse that seems to not even bother the sewage lines, buts really bad for people.
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Re: Ghost Rider Compesators
Post by Jonathan_S   » Fri Jul 08, 2016 9:49 pm

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Somtaaw wrote:Ok, so unless anyone has a better (or more specific datum anyways), I've found a few passages in Shadow of Freedom regarding Ghost Rider drones.

Quentin Saint-James had reentered normal-space twenty-six minutes earlier.
[snip]
the Ghost Rider recon platforms they’d deployed as soon as they’d made their alpha translation had traveled ten and a half light-minutes—almost 200 million kilometers—at their vastly higher acceleration. In fact, they were already decelerating towards a zero/zero rendezvous with the planet.



So the, more or less latest, Ghost Rider drones travelled almost 200 million kilometers in just under 24 minutes, and were down to under 96 light-seconds from Mobius. I'm sure exactly how fast that makes a Ghost Rider drone, but Sag-C's had a speed of 730 grav's, and the drones did the trip something like 10 times faster than the ships could have, and did it without detection. Rough mass on Ghost Rider drones has to be around the same for capital MDM's at the top end, so a max of 1000 tons or so, compared to the Saganami's 483 ktons.


[snip]
But out of curiosity, what is the acceleration those Ghost Rider drones pulled at Mobius?

There's one passage from ART which says
A Rising Thunder wrote:Without Ghost Rider’s onboard fusion plants, Solarian reconnaissance platforms had both lower acceleration rates and—compared to their Manticoran counterparts—pitiful endurance. Five thousand gravities was about the best they could turn out, and they couldn’t maintain even that power level for very long.


Then I found this, but there's no indication that's their maximum accel
At All Costs wrote:The first Ghost Rider platforms were already twenty-five thousand kilometers out, accelerating at just over five thousand gravities.


Storm from the Shadows wrote:In that same interval, the Ghost Rider platforms, loping along at the low (for them) acceleration of only five thousand gravities in order to stay stealthy, had already moved three minutes past their turnover time.




I also did a little number crunching on your quote from SoF and it looks like they must have been in excess of 16,000 gravities.
From the Quentin Saint-James numbers it appears they carried roughly 290 km/s with them from hyper - which adds up to ~450,000 km compared to starting at zero.

26 minutes at 15,900g would give you 10.54 LM, or 189,601,776 km. Factor in the initial velocity would alter that to 10.56 LM (190,054,176 km). Basically the numbers from the quote. (And incidental 0.81c) But remember the drones had to be even quicker than that because they'd already reached turnover and started decelerating.

Though the claim that they were going for a zero/zero intercept; and the above calcs had them acceperating 86% of the way there; not the way to achieve zero/zero.
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