Heat resistance

[Spartan159]

I am playing MgT with a strong dash of T5 thrown in. I want to create a house rule on heat resistance for starships using the hot and cold values given on the chart by the same name in T5. In T5 if I read correctly all armor but organic and polymer have a heat resistance of 100xAV and a coating would add a further 100x. Would this be AVx100x100 or AVx100+AVx100? At AV=15 the former results in a heat resistance of 150,000 vs the latter at 3,000. I am of course open to something based on real life facts.

If I read the table correctly the latter would survive the surface temperature of a G class star while the former would ignore pretty much anything not involving star-diving (New sport! Radiation might be an issue though).

All that MgT says about heat shielding is that a ship without a functioning gravitic drive attempting reentry will burn up, (which I am not sure is right given a streamlined ship moderately armored, not like we are talking thin aluminum here) and gives an example of a controlled reentry, then comments that an unshielded ship will take x damage close to a star (with no details of range etc).

The cost for heat shielding in MgT is MCr0.1 per ton of ship. Ouch. Radiation shielding for comparison costs MCr0.025 per ton of ship.

 

[Enoki]

Alumina (AlO) / aluminum oxide is a very heat resistant material, and relatively cheap and abundant. You could make tiles from it, or use it flame sprayed on a surface for heat resistance.

This is a product called "Kaowool" (sort of like Plexiglas is a common term for a clear plastic material). It's alumina wool and the picture shows it lining an electric furnace.

Carbon foam is incredibly heat resistant so long as no oxygen is present. A foot of this stuff will knock 2200 C down to about 50C.

I'd assume in the future that ceramics are available that are strong enough to resist impact better than current ones. They be my choice for heat resistance. They could be applied in anything from thin coats to thick layers depending on how much resistance you wanted.

Yea, for about 6 years I was designing and building super high temperature furnaces for the materials science industry. Boil steel? Piece of cake. Boil Platinum? Done. Anything up to about 2200 C was doable. Given the surface of the Sun is about 5500 C, that's PDH!

 

[Spartan159]

Yeah, I was thinking along the same lines re ceramics as to what the coating actually was. I'm looking for a clarification and/or confirmation on the rules themselves and possible guidelines to making a workable system IMTU.

I also want to justify the cost as I think MCr0.1/ton is a bit steep.

 

[kilemall]

I've been recently postulating that Reflec is less laser wavelength reflection and more heat reflection.

I suppose you could extrapolate the size of a Reflec suit, figure out the per square meter cost, and apply that to your hull costing.

 

[Spartan159]

You might find this interesting, Lurking Rhythmically, she came up with a MgT rule she calls "heatflec". IMTU I call it Thermacore I did a search on Heat Superconductivity on google and the first thing that popped up was a paper in the Cornell University library that claims that Heat Superconductivity is possible, the updated version there was from 2012 :coffeesip:

 

[Taav]

You might find this interesting, Lurking Rhythmically, she came up with a MgT rule she calls "heatflec". IMTU I call it Thermacore I did a search on Heat Superconductivity on google and the first thing that popped up was a paper in the Cornell University library that claims that Heat Superconductivity is possible, the updated version .........

Did you read the 31-century white paper on "gravimetric" and "hyperdrive" theory as well? Or can you cite a paper on sustainable commercial M-6 travel?

I am not here to debate 21-century technology. I have a child that took my T5 rule-book and, in fact, has a play-base at his "university" in excess of 9 which is larger than mine after 35+ years of play. So I am on this board looking for 52d Century discussions to share and not debate what might be possible based on narrow-focused 21st Century intelligence.

 

[Spartan159]

 

[whartung]

Did you read the 31-century white paper on "gravimetric" and "hyperdrive" theory as well? Or can you cite a paper on sustainable commercial M-6 travel?

I am not here to debate 21-century technology. I have a child that took my T5 rule-book and, in fact, has a play-base at his "university" in excess of 9 which is larger than mine after 35+ years of play. So I am on this board looking for 52d Century discussions to share and not debate what might be possible based on narrow-focused 21st Century intelligence.

That's all well and good, however, a basic premise of Traveler in general is that there are some fundamental tenets that rather than dramatically changed, will simply be refined over time. Economics and Physics are two of those tenets.

So, by necessity, we tend to project what we see in the modern world, as these things are applied, and see how they would fit in a far future with some different assumptions.

But in the end, Traveller is an Age of Sail game with jump ships instead of masted schooners. Pretty much everything else is extrapolated from that.

 

[Enoki]

There are ceramics that have good thermal conductivity like aluminum nitride. This one is also widely used as armor... Very heat resistant. It's cold to the touch if you hold a piece in your hand.

A variant is Aluminum oxynitride that also has the advantage of being able to be made in a clear form as an optical glass. Bullet proof, heat resistant, and you can see through it. Much lighter for the same armor value than bullet proof glass.

 

[Lycanorukke]

If I read the table correctly the latter would survive the surface temperature of a G class star while the former would ignore pretty much anything not involving star-diving (New sport! Radiation might be an issue though).

Looking at forming a Plutonium Rock Band are you?

 

[Spartan159]

Looking at forming a Plutonium Rock Band are you?

... Maybe... Can you play?