// Fwiffo's Toroid Nozzle Tank
// Version: 1 (2016-Aug-15)
//
// DESCRIPTION:
//
//   This scaled up version of the ROUND-8 Toroidal Tank mounts on top of a Poodle
//   engine, and stores LFO in a ring around the exhaust manifold.  Note real spacecraft
//   pump fuel through lines spiraling up the exhaust vent, in order to cool the manifold
//   and preheat the fuel.  This part also helps to lower your CoM, which can be handy for
//   landers.
//
// NOTES:
//
//   If you need to further lower the CoM, simply adjust all the Y values in this file or
//   use CoMOffset).
//
//   The stock toroidal tank has inner radius 0.3125m, outer radius 0.576m and is 0.331m tall
//   (note dimensions are approximate).  It weight 0.0375t (dry mass) and holds 27 liquid
//   fuel (0.135t) and 33 oxidizer (0.165t).  Volume is approximately 0.2 cubic metres (0.14
//   if it were a perfect toroid, but it's stretched vertically so it's actually more of an
//   Elliptic Torus - see http://mathworld.wolfram.com/EllipticTorus.html).
//   The scaled part volume is roughly 3 cubic metres (15x more) - actually a little more now
//   since the part was enlarged slightly since these calculations, for cosmetics.  It would
//   hold ~ 405 liquid fuel if scaled linearly from ROUND-8 part, but this is way too much
//   considering the X200-8 tank looks bigger in game and only holds 360 liquid fuel.  Also
//   the Fwiffo Toroidal Tank 8x (which is slightly smaller) holds 216 liquid fuel.
//   So, arbitrarily make this one hold ~ 2/3 of X200-8 = 240 liquid fuel, minus 6 to round
//   the total for the entire weldment to 1170 which makes for a nice even 1430 oxidizer at
//   the 9:11 ratio.
//
//   i.e. This tank holds 234 liquid fuel and 286 oxidizer.
//   LFO tanks in KSP all have a constant ratio of 720 liquid fuel units per ton of dry mass
//   (0.0125 tons wet mass per unit of liquid fuel) and both liquid fuel and oxidizer are
//   0.005 t / unit.
//
//   Thus dry mass of this tank is 0.325 tons, it holds 1.17t of liquid fuel, 1.43t of oxidizer
//   and total wet mass is 2.925 tons.
//
//   Note both attachment nodes are in the same spot, so that the poodle always attaches where
//   it ordinarily would go (i.e. at the bottom of the on the part above this one).
//
//   For cosmetics, the attachment nodes are positioned along the Y axis such that the poodle
//   hides the texture seam artifact visible on the top portion of the tank.  The tank is
//   vertically sized such that it envelops about 3/4 of the exhaust manifold and the black
//   braces meet nicely with the edge of the engine.
//
// CHANGELOG:
//
//   2016-Aug-15: Initial release (experimental)
//
// LICENSE:
//
//   Use this however the heck you want.  I'm not responsible for any consequences!
//

PART
{
	name = Fwiffo-NozzleTank
	module = Part
	author = Fwiffo
	rescaleFactor = 1
        // To figure out attachment point, made a tank/poodle/nozzletank stack
        // Then moved nozzletank up to desired position, making note of delta-Y
        // Poodle top hardpoint - (Poodle bot hardpoint + deltaY)
	node_stack_top = 0.0, 0.4, 0.0, 0.0, 1.0, 0.0
	node_stack_bottom = 0.0, 0.4, 0.0, 0.0, -1.0, 0.0
	buoyancy = 0.5
	buoyancyUseSine = False
	TechRequired = precisionPropulsion
	entryCost = 41600
	cost = 1517
	category = FuelTank
	subcategory = 0
	title = Fwiffo Nozzle Tank
	manufacturer = Fwiffo Industries
	description = Mount on top of a Poodle engine to store a ring of fuel around its exhaust manifold. Bill objected to this, but Werner Von Kerman assures us there's no danger storing your gas can right next to a fiery hot plume of flame.
	attachRules = 1,0,1,0,1
	mass = 0.325
//	dragModelType = default // deprecated?
//	maximum_drag = 0.2      // deprecated?
//	minimum_drag = 0.15     // deprecated?
//	angularDrag = 2         // deprecated?
	crashTolerance = 6
	maxTemp = 2000
	breakingForce = 200     // standard for size2
	breakingTorque = 200    // standard for size2
	bulkheadProfiles = size2
	tags = donut doughnut fueltank gold ?lfo lifebuoy liquid oxidizer propellant (ring rocket yellow
	DRAG_CUBE
	{
		// See post on this at http://forum.kerbalspaceprogram.com/index.php?/topic/145966-drag_cube-help/
		//              X+ Face,                         X- Face,                         Y+ (top) Face,             Y- Face,                  Z+ Face,                         Z- Face,                         Bounds Center,                Bounds Extents
		//              Face1Area, Face1Drag, F1Depth,   F2Area,    F2Drag,    F2Depth,   F3Area, F3Drag, F3Depth,   F4Area, F4Drag, F4Depth,  F5Area,    F5Drag,    F5Depth,   F6Area,    F6Drag,    F6Depth,   X, Y,           Z,            Width,     Height     Depth
		// Original:    0.2859113, 0.6272321, 0.6734665, 0.2859113, 0.6268581, 0.9227022, 1.21,   0.96,   0.2872447, 1.21,   0.96,   0.245615, 0.2958315, 0.6112254, 0.6440083, 0.2958315, 0.6160544, 1.104762,  0, 0.02261333, -2.695719E-09, 1.152236,  0.3307782, 1.135139
		// New:
		cube = Default, 2.6103702, 0.6272321, 1.4816263, 2.6103702, 0.6268581, 2.0299448, 5.8564, 0.96,   1.1920655, 5.8564, 0.96,   1.019302, 2.7009416, 0.6112254, 1.4168183, 2.7009416, 0.6160544, 2.4304764, 0, 0.0938452,   0,            2.5349192, 1.3727295, 2.4973058
	}
	MODEL
	{
		model = Squad/Parts/FuelTank/fuelTankToroidal/model
		position = 0, 0, 0
		scale = 2.2, 4.15, 2.2
	}
	RESOURCE
	{
		name = LiquidFuel
		amount = 234
		maxAmount = 234
	}
	RESOURCE
	{
		name = Oxidizer
		amount = 286
		maxAmount = 286
	}
}