Volume conversion question

[WhittD]

I'm converting some of the ships from d20 Future to Traveller. In d20F, the weight of the ship is given in tons (I assume US tons). Is there a way to convert that value to dTons?

Thanks,
WhittD

 

[DFW]

I'm converting some of the ships from d20 Future to Traveller. In d20F, the weight of the ship is given in tons (I assume US tons). Is there a way to convert that value to dTons?

Thanks,
WhittD

That is weight/mass not volume. Use D20's displacement tonnage instead. If for some reason the displacement isn't listed I think you can divide weight by 1.35 to derive hull tonnage.

 

[WhittD]

"That is weight/mass not volume"

Yep, that was the challenge. The ships I'm looking at don't list displacement tonnages, only weight. I appreciate the tip, I'll divide by 1.35.

Once again, thanks.

Whitt

 

[zero]

So... if I multiply hull tonnage by 1.35 it should list the number of tons of weight for a ship? Thats pretty cool

 

[far-trader]

So... if I multiply hull tonnage by 1.35 it should list the number of tons of weight for a ship? Thats pretty cool

Sounds about right for aircraft analogous spacecraft. Light materials, thin hulls, mostly open space or fuel. In other words Classic Traveller density.

Multiply by about 10 for TNE designs of civilian/commercial ships. And maybe up to double that for military ships. TNE seemed a more naval wet ship analogous take on hulls. Heavier and more robust.

 

[DFW]

So... if I multiply hull tonnage by 1.35 it should list the number of tons of weight for a ship? Thats pretty cool

That is what the D20 ship building rules state.

 

[Ishmael]

I dunno
1,350kg / 14 m^3 gives it a density of ~96kg/m^3 , or a specific gravity of .096
that's about half the density of balsa wood.

I'd go with a density of about .5, or 7 tonnes per dton, myself.
But it'd depend on the design methods ( MgT doesn't use mass in its design sequences? )

 

[rust]

MgT doesn't use mass in its design sequences?

Only in the vehicle design system, not in the starship design system.

 

[Jeraa]

I dunno
1,350kg / 14 m^3 gives it a density of ~96kg/m^3 , or a specific gravity of .096
that's about half the density of balsa wood.

I'd go with a density of about .5, or 7 tonnes per dton, myself.
But it'd depend on the design methods ( MgT doesn't use mass in its design sequences? )

1,350 kg per ton in merely average. Yeah, some of the dtons of a ship would be filled with machinery and mass more than that, but there is also a lot of empty space in there too. (Corridors, cargo bays, etc.)

 

[Ishmael]

yes, it is an average, but the average density is still too low....not very much more than liquid hydrogen itself, actually.
a 100ton sphere, massing 135 tonnes, made of steel would have a shell of ~3cm thick and be completely empty inside.
Such a low mass would be very nice for ships with reaction/realistic thrusters, though.

maybe this link might be helpful
http://www.freelancetraveller.com/features/shipyard/tonnage.html

so the MgT ship design doesn't track mass...unforgivable! ( imho )

 

[rust]

so the MgT ship design doesn't track mass...unforgivable! ( imho )

It results in things like reaction drives with a performance which is inde-
pendent from the ship's mass, so it is indeed a bit weird. :shock: