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Dorsal/Ventral pod launching?

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Re: Dorsal/Ventral pod launching?
Post by Dafmeister   » Wed Jun 03, 2015 12:15 pm

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JeffEngel wrote:Another point though - What's the problem with broadside pod launch, like LAC's use? The "launchers" would of course be vastly larger than missile tubes (but smaller than LAC hatches), and presumably the sidewalls could incorporate larger "gunports" for them.


I assume you're talking about old-school, pre-Shrike LACs, which had box launchers that were basically missile pods as part of their hull. I don't think the box launchers were actually detached from the ship before the missiles fired, though.

The problem with any pod launching system is that it requires a big hole in the hull for the pod to come out of. Having the pods come out of the stern puts that hole in a position that captains normally wanted to keep away from the enemy anyway in the days before sternwalls, whereas you'd have a broadside facing toward your enemy to engage with your shipboard tubes and the maximum number of control links. Even today, with bow- and sternwalls, off-bore targetting and Keyhole, putting a pod launcher in the broadside means putting that big hole through the armour of your largest target aspect. The stern is at least a smaller target, while dorsal/ventral launching would be well protected by the wedge.
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Re: Dorsal/Ventral pod launching?
Post by SWM   » Wed Jun 03, 2015 1:11 pm

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Dafmeister wrote:
JeffEngel wrote:Another point though - What's the problem with broadside pod launch, like LAC's use? The "launchers" would of course be vastly larger than missile tubes (but smaller than LAC hatches), and presumably the sidewalls could incorporate larger "gunports" for them.


I assume you're talking about old-school, pre-Shrike LACs, which had box launchers that were basically missile pods as part of their hull. I don't think the box launchers were actually detached from the ship before the missiles fired, though.

The problem with any pod launching system is that it requires a big hole in the hull for the pod to come out of. Having the pods come out of the stern puts that hole in a position that captains normally wanted to keep away from the enemy anyway in the days before sternwalls, whereas you'd have a broadside facing toward your enemy to engage with your shipboard tubes and the maximum number of control links. Even today, with bow- and sternwalls, off-bore targetting and Keyhole, putting a pod launcher in the broadside means putting that big hole through the armour of your largest target aspect. The stern is at least a smaller target, while dorsal/ventral launching would be well protected by the wedge.

No, he's talking about launching pods from bays similar to the broadside LAC bays on a CLAC. But you're point about the smaller aspect of the stern is a valid observation. With the stern buckler, stern launchers are nearly as well protected as broadside launchers, but the smaller aspect still applies.
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Re: Dorsal/Ventral pod launching?
Post by Jonathan_S   » Wed Jun 03, 2015 2:39 pm

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SWM wrote:No, he's talking about launching pods from bays similar to the broadside LAC bays on a CLAC. But you're point about the smaller aspect of the stern is a valid observation. With the stern buckler, stern launchers are nearly as well protected as broadside launchers, but the smaller aspect still applies.
Yeah, the buckler can only protect the entire ship from fairly limited angles (iirc only a few degrees off from straight ahead), but should have a wider range of coverage if you're only worried about protecting the face of the rear hammerhead.

I should rerun the geometry numbers and see...
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Re: Dorsal/Ventral pod launching?
Post by MAD-4A   » Wed Jun 03, 2015 4:14 pm

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I was thinking, with Keyhole to provide FCS, instead of a pair of square "wedges" a single "Cone" with no sidewalls. This would mean only a "Down-the-throat/Up-the-kilt" shot would be available, while the ship could still dump pods (from SDPs)/launch LACs (from CLACs). the LAC could provide additional FCS links. In this case I would want th Dorsal/Ventral bays to allow full/max hammerheads covering the only 2 vulnerable aspects of the ship. They would also contain a small # of internal tubes for use in situations not requiring a "full roll" (like pirate destroyer or warning shots etc...)
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Re: Dorsal/Ventral pod launching?
Post by Relax   » Wed Jun 03, 2015 5:55 pm

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Um, what kind of a "(_______)" pirate is going to attack a task force of SD's??? :oops: :lol: :lol: :lol: :idea: :idea:

Not to mention they have vipers in their CM tubes, and currently an Invictus SD'P can toss over 200 such missiles every 8s.
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Re: Dorsal/Ventral pod launching?
Post by Erls   » Wed Jun 03, 2015 8:24 pm

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Vince wrote:
Erls wrote:So, here is my vision of how this might work.. The pods are not launched straight up or down, but instead on angles in an area much less likely to be hit than even the aft hammerhead on an up the kilt shot. The red line is the current pod-rails, and the green lines are the 'new' pod-rails. The blue path is the path taken by the pods with the use of a minor tractoring of them, setting them up on a path to clear the wedge easily.

***Image snipped***

*Beware my mad MSPaint skillz!!

When viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force, or more colloquially, an object in motion will stay in motion with the same speed and direction, unless an external force is applied to it. Issac Newton's First Law.

Change the blue lines so that they are either parallel to each other or slightly diverging, otherwise the pods will collide as they continue in the direction they are traveling. The planes of the impeller wedge, even at its narrowest (aft end) are much further apart than the ship is tall. (The wedge is about 40 kilometers wide at the aft end, and even an Invictus SD(P) is nowhere near that, with its dimensions given as 1394 × 202 × 188 meters*.) See the image in Wedge geometry and compare size of the superdreadnaught with the distance between the planes of the wedge at the aft end.

* Dimensions of the Invictus SD(P) from House of Steel.


You are correct in that I bent the projected arch of the pods to far back towards the plane of the ship.

The main point was a visualization that pods didn't have to be launched at 90 degrees from the ship and instead could be angled back and then tractored to clear the wedge.

This could actually increase the pod deployment of a SD(P) by a good margin. Figuring a current deployment of 6 pods per 12 seconds, there is both a ship based and wedge based reason for that limitation. The pods have to be far enough apart to avoid wedge fratricide, while the ship can only launch so many in a single go.

With two different launch points, you would increase distance between the pods (in essence increasing the broadsides from 1 level to 2 levels). Even if each launcher could only handle 66% (4 pods) of the original, that would still lead to 8 pods per launch instead of 6, or a 133% increase in total pod deployment per 12 second interval.
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Re: Dorsal/Ventral pod launching?
Post by Relax   » Wed Jun 03, 2015 8:32 pm

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A pod is going to be making a giant hole. 4 such giant holes top and bottom is a non starter if you asked me.

Now 4 total, 2 bottom, 2 top. 1 at forward 1 at aft.

Add two additional deployment points. 1 at each hammerhead, would make more sense. 6 total.

Deploying the pods in a timely manner is not a problem as seeing a task force requiring a ton of missiles is fairly easy and obvious and with a closing time of well over an hour, predeploying pods is fairly easy.

Dorsal Ventral deployment points is all about damage redundancy and not about decreasing deployment time per pod.
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Re: Dorsal/Ventral pod launching?
Post by MaxxQ   » Thu Jun 04, 2015 12:54 am

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JeffEngel wrote:
Vince wrote:When viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force, or more colloquially, an object in motion will stay in motion with the same speed and direction, unless an external force is applied to it. Issac Newton's First Law.

Change the blue lines so that they are either parallel to each other or slightly diverging, otherwise the pods will collide as they continue in the direction they are traveling. The planes of the impeller wedge, even at its narrowest (aft end) are much further apart than the ship is tall. (The wedge is about 40 kilometers wide at the aft end, and even an Invictus SD(P) is nowhere near that, with its dimensions given as 1394 × 202 × 188 meters*.) See the image in Wedge geometry and compare size of the superdreadnaught with the distance between the planes of the wedge at the aft end.

* Dimensions of the Invictus SD(P) from House of Steel.

If the pods have tractors, and the tractors have a presser function, pods could push one another out of the way to get divergent trajectories, once they're clear enough of the wedge. That said, they'll spread enough if the paths are just divergent enough to clear the wedge reliably.

Another point though - What's the problem with broadside pod launch, like LAC's use? The "launchers" would of course be vastly larger than missile tubes (but smaller than LAC hatches), and presumably the sidewalls could incorporate larger "gunports" for them.


Ummmm, guys...

Look at the image here:

http://maxxqbunine.deviantart.com/art/P ... -465723504

See those notches/openings at the corners? Those are RCS thrusters. Not too difficult to use them to move the pods exactly where you want them to go after they've been launched.

Pods *do* have tractors, but they are mainly meant for attaching themselves to a ship, and AFAIK, are not equipped with pressors.
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Re: Dorsal/Ventral pod launching?
Post by SWM   » Thu Jun 04, 2015 8:57 am

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MAD-4A wrote:I was thinking, with Keyhole to provide FCS, instead of a pair of square "wedges" a single "Cone" with no sidewalls. This would mean only a "Down-the-throat/Up-the-kilt" shot would be available, while the ship could still dump pods (from SDPs)/launch LACs (from CLACs). the LAC could provide additional FCS links. In this case I would want th Dorsal/Ventral bays to allow full/max hammerheads covering the only 2 vulnerable aspects of the ship. They would also contain a small # of internal tubes for use in situations not requiring a "full roll" (like pirate destroyer or warning shots etc...)

Wedges have open sides not because people wanted to be able to fire weapons from the broadsides. They have open sides because that's the way impellers work. An impeller wedge is two planes inclined together, and that's just the way the physics works.

You cannot have the sides closed off with another wedge, or roll the wedge into a cone or anything like that. You can use sidewalls to imperfectly protect the broadsides, but you cannot have a true wedge wall on the sides.
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Re: Dorsal/Ventral pod launching?
Post by JeffEngel   » Thu Jun 04, 2015 12:38 pm

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MaxxQ wrote:
JeffEngel wrote:
Ummmm, guys...

Look at the image here:

http://maxxqbunine.deviantart.com/art/P ... -465723504

See those notches/openings at the corners? Those are RCS thrusters. Not too difficult to use them to move the pods exactly where you want them to go after they've been launched.

Pods *do* have tractors, but they are mainly meant for attaching themselves to a ship, and AFAIK, are not equipped with pressors.

I was speculating that tractors have a presser function if reversed. It's speculation, it's open to correction if anyone's got textev or counter-speculation - it's just what I would assume barring some strong positive reason not to. I'm not supposing they've got separate pressers or could readily be equipped with them.

I don't think anyone's forgotten the thrusters on the pods. I just think we've been figuring on them generating insufficient thrust to make a difference for wedge clearance, either avoiding the wedge of the ship on the way out, or avoiding being too close to one another for the missiles to separate safely soon after a launch.
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