l0rDn0o8sKiLlZ
05/23/18 12:51 AM
73.160.194.67
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I'll get right to it.
Q-1: What is the Crush Depth for a 75-ton OmniMech?
Q-2: Does Reinforced Structure increase a Battle/OmniMech's Crush Depth.
Q-3: If yes to above; what would the Crush Depth on a 75-ton OmniMech look like w/ Reinforced Structure?
Q-4: Also if yes to Question 2; would Composite Structure have the opposite effect?
Q-5: Slightly off topic, but can MASS be used with a Full-Head Ejection System?
Q-6: VERY off topic, but could UMUs and BattleMech HarJel Systems be mounted in OmniPods?
Thanks in Advance!
"Woad Raider, kill things today."
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AmaroqStarwind
05/23/18 01:24 AM
108.255.82.176
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HarJel cannot be pod mounted, but since UMUs are a type of Jump Jet, ues they can, provided you don't combine them with actual Jump Jets.
Discord: Amaroq the Kitsune#1092
Telegram: @Lycanphoenix
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Requiem
05/23/18 03:13 AM
58.175.193.140
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Sorry but this is a very difficult question to answer with a definitive answer…
Submarines crash depth is limited by the strength of their hull
However for Mechs you must consider their weakest point(s) under water, that is, the cockpit contained within the head and the Entry / Exit door to the canopy itself.
When discussing the canopy let us consider a couple of Mechs ….
Battlemaster / Zeus – large area of “glass” to give the pilot a clear view of the battlefield – the pressure of the water on this will cause micro-fractures and then large fractures – suddenly the pilot is enveloped in water … too deep and KIA. Especially if the glass is square in design
Ok you may be thinking what … square windows? ….. think about the 1st Gen. commercial aircraft jets when they first came out they had square windows (de Havilland Comet)… this lead to micro-factures (at the tip of the square) and eventually the entire plane fuselage breaking in two. That is why we now have oval edges to them now.
Thus the amount of pressure they can take depends on how they are designed, the materials used etc.
Then you need to consider the hydrostatic pressure – the deeper you go the more pressure exerted. (note this will change as gravity changes on the planet)
Also have you ever seen a window on a submarine? The absence of this may give you an idea as to why.
Though on the small remotes that went to the bottom for the Titanic – they had a sheet of clear plastic between the water and the camera. (Though this was designed specifically for this depth)
Thus you cannot determine a crash depth unless you put it (the ‘Mech) in a tank and simulate depth (at a certain gravity) until you get a catastrophic explosion to the head. Also this would be for that one type of ‘mech only as all are designed differently.
However if you got a engineer and asked to create a new head that could take the pressure – who knows how deep you could go before the remaining body gave out first
So therefore it is impossible to give you this information – that is unless one of the designers put that info in somewhere.
So for the remaining of the body – yes a reinforced body will affect the crash depth …. Composite structure? Depends on what it is made out of – its strength – how it behaves to heat / cold / extreme pressure – you wold need someone who understands materials very well to answer this question as a small change in the % make up will have large changes to its overall properties.
MASS with a full head ejection system – do you have one critical slot next to the cockpit open – if yes then yes you can – However if it was me I would get a very good engineer to design a new head that could survive under water (to a predetermined depth) - in the event the body is destroyed eject the head …. Is Battle Magic available?
Requiem
Adelaide, Australia
Get thee to Coventry … Now is the winter of our discontent, made glorious by this daughter of Tharkad … Our army shall march through. Well to New Avalon tonight.
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Retry
05/23/18 10:34 AM
174.70.184.145
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Q1: A table for extreme depths effects is on Tactical Operations Pg42.
Q2-4: The "soft" crush depth, where you have to make crush depth checks, starts at 15+ hexes (90 meters) for all Battlemechs regardless of structure, under standard gravitational conditions (lighter gravity means a 'Mech or vehicle can go deeper before getting crushed).
EDIT: A 75 ton 'Mech gets a +7 bonus to crush checks for being 75 tons. The base THN for breach checks for a 'Mech is 10 by the table, so that + the bonus makes the to-hit # 17 at depth 15. Since 2D6 can roll 12 at most, the 'Mech is only at risk if the THN drops below 13. For a 'Mech, the THN drops -1 every 1 depth higher (lower?) than 15. 17-4(4 depths lower than 15)=13, making the max safe depth for crush checks 19 (114 meters). The 75 tonner is only at risk to getting crushed at Depth 20 or more (120 meters). This can be modified slightly by adding Harjel (+1 to the modifier, effectively giving 1 extra "safe" depth) or a Harjel II/III Repair System (+2 modifier to crush depth, 2 extra "safe" depth).
Note that by these rules, Subs are king, as they can go ridiculously low without experiencing the crush depth issue. A midget submarine (built under the regular vehicle construction rules, 5-300 tons, not as a support vehicle) can go up to depth 49 without suffering from crush depth roles (Even your biggest, most modified superheavy 'Mech *will* be crushed well before that point), and only has to roll at depth 50+.
Your real submarines built w/ large naval support vehicle templates can go far deeper than that. A 300 ton submarine has a hefty +60 to the crush depth role, and since a submarine only adds -1 to the modifier every 5 depths instead of every depth you can easily make it to lower than depth 150, where the THN for a hull breach or crush check becomes 8 by the table. 8(THN)+60-55(Every 5 depths below 50, 50+55*5=325 total depth)=13, making it safe and immune to crushing until depth 330 (nealy 2 kilometers), which can be slightly improved with Harjel I thru III. It's worth noting though that weight has the reverse effect on these large naval craft as becoming heavier actually penalizes the target crush-depth modifier, so a 100,000 submersible supercarrier can't dive as deep as safely as a 300 ton submarine.
With that said it's a pretty neat idea and makes sense, having structure type influence crush depth. Could go well as a house rule of some sort, though I would highly doubt you'd find many situations where this actually proves useful.
Q5:There's no overt restriction of F-H EJ + MASS being illegal so I'd say yes.
Q6:UMUs can definitely be pod-mounted. Harjel II and III (repair systems) cannot. I can't find anything explicit on regular Harjel so I'm going to go with Amaroq here and say probably not.
Edited by Retry (05/23/18 11:27 AM)
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