MK3 Parts weak joints - breakingForce & breakingTorque not set in cfg

[billyoak]

Hi,

I noticed that the breakingForce & breakingTorque are not set in the cfg's for the mk3 parts. As a result these craft are very fragile.

For example the following craft with almost no fuel and no payload needs to land with a vertical velocity of about 1m/s other wise it will fall apart.

Copying the breakingForce & breakingTorque for 3m parts into the cfg's for equivalently sized mk3 parts appears to make the craft behave more consistently.

Example

----------------------------------------------------------------

cfg from the large mk3 LFO fuel tank

PART

{

name = mk3FuselageLFO_100

module = Part

author = Porkjet

rescaleFactor = 1.0

node_stack_top = 0.0, 5.0, 0.0, 0.0, 1.0, 0.0, 3

node_stack_bottom = 0.0, -5.0, 0.0, 0.0, -1.0, 0.0, 3

node_attach = 1.63, 0.0, 0.0, 1.0, 0.0, 0.0, 1

TechRequired = experimentalAerodynamics

entryCost = 84000

cost = 10000

category = FuelTank

subcategory = 0

title = Mk3 Rocket Fuel Fuselage Long

manufacturer = C7 Aerospace Division

description = Filled to the brim with Rocket Fuel, C7 Aerospace's supplier Ekson-Kobil have assured us that this tank is absolutely airtight.

attachRules = 1,1,1,1,0

mass = 7.14

dragModelType = default

maximum_drag = 0.2

minimum_drag = 0.3

angularDrag = 1

crashTolerance = 50

maxTemp = 2300 // = 3000

emissiveConstant = 0.87

fuelCrossFeed = True

bulkheadProfiles = srf, mk3

MODEL

{

model = Squad/Parts/FuelTank/mk3Fuselage/LFO_100

}

RESOURCE

{

name = LiquidFuel

amount = 4500

maxAmount = 4500

}

RESOURCE

{

name = Oxidizer

amount = 5500

maxAmount = 5500

}

}

----------------------------------------------------------------

cfg from the equivalent 3m part

PART

{

name = Size3LargeTank

module = Part

author = Squad

mesh = Size3LargeTank.mu

rescaleFactor = 1

node_stack_top = 0.0, 3.74, 0.0, 0.0, 1.0, 0.0, 3

node_stack_bottom = 0.0, -3.74, 0.0, 0.0, -1.0, 0.0, 3

node_attach = 0.0, 0.0, -1.89, 0.0, 0.0, 1.0

TechRequired = highPerformanceFuelSystems

entryCost = 46600

cost = 13000

category = Propulsion

subcategory = 0

title = Kerbodyne S3-14400 Tank

manufacturer = Kerbodyne

description = When nobody believed in (or even asked for) an even larger fuel tank than the already enormous S3-7200, Kerbodyne stepped up with the sanity-defying S3-14400 model. Carrying fully twice as much fuel as before, this fuel tank may just pack enough propellant to justify its proportionately enormous cost.

attachRules = 1,1,1,1,0

mass = 9

dragModelType = default

maximum_drag = 0.2

minimum_drag = 0.3

angularDrag = 2

crashTolerance = 6

breakingForce = 400

breakingTorque = 400

maxTemp = 2000 // = 2900

bulkheadProfiles = size3, srf

RESOURCE

{

name = LiquidFuel

amount = 6480

maxAmount = 6480

}

RESOURCE

{

name = Oxidizer

amount = 7920

maxAmount = 7920

}

}

[sal_vager]

This is not really a support issue, moving to S&DD.

[Apollo22]

I had noticed this weakness but I didn't know where it came from, thank you.

[Azimech]

Since the new MK3 parts often use the models of the B9 set (for example: the cargo bays), you could take a look at the values in there and compare them.

[billyoak]

Hey guys "Stock Bug Fixes" has a fix for the Mk3 part strength being a bit low.

http://forum.kerbalspaceprogram.com/threads/97285-KSP-v1-0-2-Stock-Bug-Fix-Modules-%28Release-v1-0-2d-3-18-May-15%29

<<+ Mk3StrengthFix (18 May 15) - (STATUS: Updated Release) - Description: Mk3 parts are easy to break relative to their size. [spoiler: Notes] >>

[michaelsteele3]

Elmer's Glue. Gotta love Elmer's Glue.

[billyoak]

Elmer's Glue. Gotta love Elmer's Glue.

Even though the 3m parts are the same size and basically the same mass i think the stock fix might be a little too strong but it is a big improvement not having to nurse larger craft down on pillows and struts. Im sure the correct answer is between the two.