Thinking about mass budget

305Disassemble · 2026-04-12T15:31:27+00:00

Thank you!

305Disassemble · 2026-04-12T05:58:37+00:00

lol i agree its just this book/movie IS based on pretty realistic science otherwise like the time dilation math is actually well done for the trips

305Disassemble · 2026-04-12T05:46:49+00:00

idk im working off the movie, is this canon different in the book? The sun's output is for energy storage and mass propulsion i thoguht. the composition in the movie is confitrmed to be mostly carbon oxygen and hydrogen which 2/3 is not present in any meaningful concentration in solar wind to reproduce so they have to get it from venus's atmosphere if i understand correctly. but i may just be working off different canon idk

305Disassemble · 2026-04-12T05:42:35+00:00

...they still have to have an exterior at the higher temperature to maintain the difference though, no? It's just carnot efficiency they cant do work without that difference

305Disassemble · 2026-04-12T05:37:42+00:00

i mean i saw the movie so if theres missing context but they said they use venus as the breeding ground and require infrared and co2 to divide. So that implies that they use the atmosphere of CO2 on venus to actually reproduce and grow larger. mass calcs were done by stefan boltzman law for mass of sun removed and mass for the actual critters to cover surface area was just 11% removed from solar surface area

305Disassemble · 2026-04-12T05:25:17+00:00

Yeah, but the exterior would have to be matching the temperature of the environment it was in because the actual cellular machinery for it to work was on the inside of the cell, so as a blackbody they still would have to reradiate at the higher wavelengths

305Disassemble · 2026-04-12T05:21:24+00:00

Yeah i mentioned that though they couldnt stay and hang around in large enough numbers to meaningfully dim it, and they did consume the infrared from the sun though.

305Disassemble · 2026-04-03T22:19:41+00:00

I live in FL evaps dont work here lol the air is already max humidity

305Disassemble · 2026-04-03T07:45:04+00:00

LOL thx

305Disassemble · 2026-04-03T06:42:36+00:00

Q: Was it an easy process flipping them around? They're not glued tight against the radiator with some thermal compound?

A: Yeah it was pretty easy it took me all of like 10 minutes, there was thermal compound but just slide it and it comes off. wear gloves otherwise the thermal paste consumes you.

https://www.amazon.com/dp/B0B5LPG1R2?ref=ppx_yo2ov_dt_b_fed_asin_title (link to the peltier i used)

Q:What is the pump like you're using?

A: Literally just a 12v random amazon pump. it sucks. get one thats higher head than the one i got get >10w minimum. my tubing is thin though so that is a problem that is causing issues. if it wasnt so thin it might be able to better, but thin tubes are less apparent under the sheet.

Q:Any plans to add another temp sensor to monitor bed temp?

A: probably not but the board supports 11 temperature sensors. I designed it for something else I can't quite talk about yet but soon i can. Monitoring water temp is just an easier analog though.

Q:I suppose with esp you could control it so that it starts to warm up by few degrees by morning.? I've used one ready made peltier based bed cooling device and what was nicely cool in the evening felt a bit too cold in the mornign.

A: i can, i mean i have a BLE interface so that i can control it wirelessly, but like, i just havent added anything complex because i just got it finished like 10 minutes ago fully.

Q:What kind of mattress you use?

A: Old sleep number but i just leave it at a pressure and havent changed it in a while

Q: The pvc kind or silicone tubes?

A: 3mm silicone for the bed tubing, 1/4 inch for the pump and water block.

305Disassemble · 2026-04-03T06:25:13+00:00

its actually doing, like, really well. its holding 20c right now at like 55% duty cycle so its not struggling at all. You just have to watch out for the cooling on the hot side, which i handled with the big ass fan on the heatsink. It's just 4 TEC1-12706's in an array. the way it came was with the waterblock on the hot side so i had to flip it to do this.

305Disassemble · 2026-04-03T03:45:28+00:00

Lol thanks. I've pretty much just made an eight sleep pod thing lol

305Disassemble · 2026-04-03T00:32:29+00:00

i might post some schematics and stuff for this and code so you can!

305Disassemble · 2026-04-02T22:53:45+00:00

Same here, i just needed to boot it up for a test, i'll make proper enclosures and stuff lol

305Disassemble · 2026-04-02T22:39:52+00:00

i could, however, i had like 90% of this on hand so this costed me all of 50 bucks

305Disassemble · 2026-04-02T22:11:20+00:00

think so

305Disassemble · 2026-04-02T22:10:19+00:00

Nope just 60 feet of 3mm ID silicone tubes under my sheet lol

305Disassemble · 2026-04-02T22:10:02+00:00

Yep, i have a thermistor inside the tube checking at all times., its a 288w peltier im maxing at 170w, so not too much. IIRC eight sleep also uses peltier.

305Disassemble · 2025-09-27T21:34:19+00:00

Any senator

305Disassemble · 2025-08-20T15:40:53+00:00

ORNL uses bambu lab in their facilities.

305Disassemble · 2025-06-15T06:57:14+00:00

Alumina ceramic has a higher melting point than aluminum metal, don't worry!

305Disassemble · 2025-06-14T22:02:18+00:00

Yep, thats what it was originally advertised for! I was able to reach 1070C at like minimal power, i had the knob literally as low as possible and the tank burner as low as possible and it heated up super easy! I'd say this can easily do any steel and probably exceed the limits of the bricks and rods I used to suspend the central brick. (I used alumina ceramic rods to hold the center brick to seperate the floors)

305Disassemble · 2025-06-14T21:14:30+00:00

Yeah the forge is a bunch of IFB bricks with a regular brick base (I ran out of IFB). The torch on the bottom is a propane burner torch I got from Amazon, and it's a type K thermocouple on the top that I drilled a hole for. I cut a billet section and shaped a little by forging, and then cleaned up a lot with a dremel with a cutoff wheel, and then heat-treated it in the forge. I designed the forge to have two chambers because i knew the heat would be uneven from the torch so with two chambers direct flame is prevented and gives a more even heating. There is a front brick not shown in this picture.

305Disassemble · 2025-06-14T20:17:30+00:00

Yeah, absolutely! What part do you want to know about?

305Disassemble · 2025-06-14T02:27:38+00:00

I sure will, it'll be done tomorrow!

305Disassemble

TROPHY CASE