A DRAFT RULE FOR DETERMINING ARMOR TN AND REDUCTION SCORES WHEN DONNING ARMOUR IN PIECEMEAL.

Submitted for consensus approval by Henriech C. Libay, M.D., on the ninteenth of April, year two-thousand and twelve.

Sometimes, bushi will find themselves wearing less than a complete (full-match) set of armour. Component pieces were designed to complement each other, when worn together, to provide the maximum amount of protection.

This TRIAL RULE is to help determine the Effective TN if wearing less than a full-match set of armour.

The following is a list of armour pieces and the according weighted TN (TNtbH bonus):

Component Armour (build)	Weighted TNtbH
do (leather clam shell)	0.999
do (leather splint)	1.665
do (metal clam shell)	3.33
do (metal splint)	2.664
haidate (brigandine)	1.665
haidate (brigandine & chain)	2.331
haidate (plate)	3.33
jingasa (metal)	0.999
kabuto (3-8 plate)	1.332
kabuto (16-32 plate)	1.665
kote (plate)	2.664
kote (splint)	0.666
kote (splint & chain)	1.332
mempo	0.999
sode (leather splint)	1.332
sode (metal splint)	1.998
sode (plate)	2.664
suneate (plate)	1.332
suneate (splint)	0.666
suneate (splint & chain)	0.999

To determine the Effective (aggregate) TN, simply sum-up (round-up) the Weighted TNtbH values of the individual component armour worn as the conditional matching-set.

To determine the Estimable Reduction value of the worn set of armour, give 1-point for every component that has a Weighted TNtbH value greater than or equal to one; then add one to the final result.

For functional examples, reference the following (as determined from the most common composition of a match-set armour):

Armor Type	component-parts	Weighted TNtbH	Effective TN	Reduction
ASHIGARU	jingasa (metal)	0.99
	do (leather clam shell)	0.99
	suneate (splint)	0.66	2.7	1
LIGHT ARMOR	do (leather splint)	1.655
	kote (splint)	0.66
	suneate (splint)	2	4.4	3
HEAVY ARMOR	do (metal clam shell)	3.33
	sode (metal splint)	1.998
	kote (splint & chain)	1.332
	haidate (brigandine & chain)	2.331
	suneate (splint & chain)	0.99	10	5

The above ruling is applicable for match-sets of armour (may not be complete, but donning more than two pieces of armour). If a character is donning two or less pieces of armor, simply add the according TNtbH values to determine the Effective TN (as above), then reduce it by a factor of two. If the sum is less than 1, then utilize the value 1 as your Armor TN.

Furthermore, as there is not enough pieces to effectively compliment each other, assign zero (0) as your default Reduction value for wearing such haphazard collection.

So, let’s say, all you intend to wear is a haidate (plate-build) worn as a sode; your functional TN would be 1. 33 (3.33 minus 2, round-down), with o Reduction.

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Definition of terms:
do – torso armor, includes 4 to 8 tassets
kote – armored sleeves, sewn unto heavy cloth
sode – shoulder plates
suneate – shin guards
haidate – armored skirt; thigh protectors
kabuto – full-helm
mempo – face mask