Lord Skimper wrote:Also Chobham armor is heavier than RH Armor. It uses heavy metal plates and very hard ceramics.
You mean our antiquated, pre-KF drive, 1st gen composite armor?
Lord Skimper wrote:... the armor is not light weight.
By there (SL
) standards & for the same squar ft of coverage - not for the same volume
- it is much thicker per pound than cold rolled steel and much lighter per cubic foot. you seem to think in 2 dimensions only, is you real name Kahn? (jk)
Lord Skimper wrote:Also Chobham armor is heavier than RH Armor. It uses heavy metal plates and very hard ceramics. Neither of which alone make good armor. From everything written in the Mech books the armor is not light weight but heavy metal armors.
No, if that were so then it would not be ablative. In-fact the Mech design diagrams always show composite:http://www.sarna.net/wiki/Armor_-_BattleMechs_%26_Vehicles
(image too big for posting)
Yes they call it names like 'Durallex Heavy' but they aren't cold rolled steel like from an Iowa class battleship (or King Tiger). It is:
The first layer is extremely strong Titanium alloyed with steel, the result of crystal alignment and radiation treatment, which is also very brittle. The second layer is a ceramic, cubic boron nitride, which combined with a web of artificial diamond fibers acts as a backstop to the steel layer. These two layers rest atop a titanium alloy honeycomb structure which provides support, and a layer of self-sealing polymer sealant which allows for space and underwater operations
mostly titanium and ceramic with only a little steel(Iron) in the first layer
Lord Skimper wrote:A 90 ton Cyclops should be about 44% taller than a 30 ton Urbanmech.
no, it will have more volume, it doesn't have to be 'taller'. look at the drawings, they are wider and thicker, and there extremities (arms/legs) have more girth. most of the extra weight is for more weapons and armor and heavier support structure to hold up those heaver weapons and armor. the cockpits the same, the gyro is a small item and most of what's left of the extra weigh is in the (usually) larger engine (in these extreme examples).
most Mechs (30-100tn) have roughly the same engine (240-300)
[100tn@3/5=300, 85tn@3/5=255, 75@4/6=300, 70@4/6=280, 65@4/6=260, 60@5/8=300, 60@4/6=240, 55@5/8=275, 50@5/8=250, 45@6/9=270, 40@6/9=240, 35@8/12=280, 30@8/12=240]
So much of the weight difference is in the weapons, armor and supports for them.
As to increasing the size for more support structures: When the British built the Courageous class BCs they were built as light as they thought they could be. When they went out on trials they nearly shook themselves apart before reaching max speed. So both were sent back to the yards and large amounts (far more than 100tn) of new supports were added to the ships to give them more support structure. No additional height (or length were added for the increased weight).
Lord Skimper wrote:Given same armour densities etc... A 90 ton Mech 44% taller with 10 tons of Armour would have thinner Armour than a 30 ton Urbanmech with 6 tons of Armor.
No, it's not 44% taller - that is taken into account by the 16pt/ton - if the lighter Mechs were significantly smaller then they should get more points/ton than a physically 'larger' Mech.
Lord Skimper wrote:Also smaller Mechs shouldn't have the same number of critical slots as larger Mechs.
That is a level 3+ optional rull (which tends to invalidate a lot of the designs) and the FF/Endo should take up fewer crit slots for a smaller Mech as-well. By your logic the Cyclops's 360pt engine should take up far more crit slots than the Stingers 120pt (and far lighter) engine (or even the Stinger itself - which is lighter than the 360 engine by itself), as would it's larger/heavier gyro and actuators, too much to worry about.
Lord Skimper wrote:A Short 20 ton Mech would have thicker armour than a taller 20 ton Mech at the same weight.
Again, your equating Mass and Volume which are 2 different stats, which take up more room, a ton of led bars or a ton of fluffy feathers?
Imagine a box (would draw it but can't post plain pics)
the box is 6' x 6' x 6' that's 216 squ ft volume.
the box is made of 12 x 1/2" diameter x 6' long hallow aluminum poles (like thin tent poles) and plated with 6x sheets of thin aluminum foil.
now make another box with the exact same dimensions
this one is made of 12 x 2" square solid titanium rods 5' 10" long and 6x sheets of 1" cold rolled steel armor plates.
do they weigh the same? no, is the heavier one larger? no its the exact same size (by definition). do they have the same amount of empty internal volume? no the lighter one has a lot more volume empty.
The Cyclops is heavier not because its so much taller but because it has more of the general volume contained (no spindly tent-pole legs) and because its internal volume is full of more stuff.