Calculating Capital Ship Armour

[phavoc]

Ok, I'm a bit confused with the example provided by Mongoose in the High Guard book.

The example the use is adding 8pts of crystaliron armor to a 20,000 ton ship.

Now, I get the 10% of base hull tonnage for volume for 8pts (10% of 20,000 is 2,000).

Where they lose me is in their cost calculation formula. The example is 20,000 x (MCr .1 * 90%) x 20% for 360MCr. Where 20,000 equals hull tonnage, .1MCr equals 10% (5% for 4 pts, 10% for 8pts armor), and the 20% is the cost (20% of base hull).

So where the hell are they getting 90% from? I checked my errata and it wasn't listed there. There's nothing explaining why they are calcuculating it at 90% instead of 100%.

By the description I calculate it should be MCr400 for 8 pts of Crystaliron armor added to a 20,000 ton ship.

But... they don't. This is my first attempt at building a capital ship and I want to make sure I'm doing it right (am also trying to build a speadsheet to somewhat automate some of this, so understanding formula is important!)

Any ideas? Did I miss something? This is from 63 of High Guard

 

[BFalcon]

Planetoids are armoured like close structure hulls - not sure, but maybe the -10% cost modifier for CS hulls on page 62 applies to armour?

(I'm newish to cap ship creation too)

 

[BFalcon]

Just double-checked...

The 20,000 x MCr 0.1 x 90% = the base cost of an equivilent Close Structure hull type for a 20,000 tonnage.

So you're basically looking at: Hull Cost x 20%, but because it's a planetoid in the example, you need to work out the theoretical cost of an equivilent CS hull in order to work out the cost of the armour. Had it been a standard type, you'd have already worked it out, so could just plug the figures in directly.

 

[phavoc]

I'm confused as to how a close structure could also be a buffered planetoid. There is a seperate cost structure for them. According to the rules they cost CR4,000/ton to tow AND drill out.

I sometimes really hate Mongoose for doing dumbshit like not actually checking their own damn rules...

Unless I'm wrong somewhere, but if I am, damned if I can figure it out from the example they give.

 

[locarno24]

So where the hell are they getting 90% from? I checked my errata and it wasn't listed there. There's nothing explaining why they are calcuculating it at 90% instead of 100%.

Yeah....don't really know, but I'd assume it's mean to represent closed structure.

Certainly I get the impression that the 'Hull Cost' used for armour, reinforced hull, or whatever, includes any modifiers for shape or TL.

I genuinely hadn't noticed the example - I tend to ignore those because so many don't make sense...

 

[billclo]

I've basically started to ignore the examples they give, since they often don't match up to the text description.

 

[BFalcon]

phavoc: if you read the planetoid description, it says to treat it as a close-structure for the purposes of adding armour - this is because the planetoid doesn't cost anything to buy, since they just find an appropriate asteroid and pull it back to the shipyards... so they needed to come up with a hull "price" to use for buying addons and the like, so they kept it simple, I guess.

And they used the planetoid, not the buffered - the buffered is tougher so would have a higher base armour stat I think.

 

[phavoc]

Oh, ok. That makes sense, definition wise at least.

I'm kinda stumped that hull cost is factored into armor cost... but I gave up on scratching my head after I lost all my hair from scratching my head!

Thanks for pointing that out.

 

[BFalcon]

No probs - glad to be able to help.