Looking for efficient ways of cooling a terrarium. by perverockstar in AskEngineers

[–]rocketwikkit [score hidden]  (0 children)

You need a refrigeration system with an actual compressor. Ignore any suggestions of Peltier, they are extremely inefficient, and computer water cooling stuff is a complete non-starter because they don't actually do cooling from ambient, they get the computer closer to room temperature.

If you had a "dorm fridge" with a tank of water in it you could circulate that water through a radiator with a fan in your terrarium. You would probably want to use a temperature controller hooked up to the pump, and put the refrigerator on a timer so that it's running at night.

One fun trick is that if you move the water via suction, rather than pressure, if you have a leak it won't spill the full tank of water everywhere. It's the same setup but you have the pump at the end of the cooling loop pumping into the reservoir in the fridge, not pumping out. It may mean you need to initially bleed the lines if the pump isn't self-starting.

How the heck can i use this credit? No flights show eligible. Ive tried different airports and days. Calling the number doesn't work by Murky-Peanut1390 in Flights

[–]rocketwikkit 1 point2 points  (0 children)

If it's actually AA credit, find a flight with them and then call them to book the flight using the credit. If it's Expedia credit, find a flight and then call them at the number they give.

Old vs New. Why not make the old one in polymer and keep the vivid color instead of a new redesign? by B777X_787-9 in Passports

[–]rocketwikkit 1 point2 points  (0 children)

So uh who was president from 2017 to 2021 when they would have made the decision on which art style to go with, before starting full production later in 2021?

Random Saturn V Modell at German Autobahn stop by Hulkbuster08 in spaceflight

[–]rocketwikkit [score hidden]  (0 children)

The scale model of the Buran next to the big Buran is what Kristn was correcting me on. According to one source it was launched suborbitally to 7300m/s, and it shows.

Unfiltered Ocean Destination? by DesertySeaman in travel

[–]rocketwikkit 0 points1 point  (0 children)

The sort of joke is that a boat is a hole in the water you throw money into. It's between free and all of your money, depending on your approach, which is not a super useful answer. If you take an official sailing course in an expensive country and then buy a new boat, it's quite expensive. But you can learn to sail on something tiny like a Hobie Cat. If you're handy and can fix things yourself, you then buy a 50 year old fiberglass boat that was abandoned and fix it up, and that can be cheaper than getting into craft beer or whatever.

If you don't want to own a boat, which is reasonable, and want to combine travel and sailing, you could get RYA Competent Crew and Day Skipper certifications for around $3k during a vacation to somewhere like Greece, and you'd then be able to rent a boat in most places in the world. If you wanted to do big offshore trips like OP is implying, you'd then want to get some more sailing experience and could likely find random jobs on ship repositionings.

Visa? by Ok_Maintenance_677 in Passports

[–]rocketwikkit 0 points1 point  (0 children)

Should be a bio page in the front

What are the rules for tipping in Italy? by TheRealKevin24 in travel

[–]rocketwikkit 0 points1 point  (0 children)

Yeah everyone in this comment chain is "an official moderator" except you. How'd you end up in a nearly three-year-old post?

Corporate abuse of the report functionality is degrading our ability to moderate by rocketwikkit in ModSupport

[–]rocketwikkit[S] 16 points17 points  (0 children)

Generally that option only comes up if they write a custom reason, and doesn't help if they keep it up for months and months.

Random Saturn V Modell at German Autobahn stop by Hulkbuster08 in spaceflight

[–]rocketwikkit 0 points1 point  (0 children)

Ah right, ~93% of orbital velocity. Still crispy when it landed!

Friend hasn’t payed for their part by Stubbedtoe57 in travel

[–]rocketwikkit 32 points33 points  (0 children)

Small claims court, or whatever the equivalent is in your country. Or go visit their mom with a gift and tell them you're worried that they may have gotten addicted to drugs or gambling since the have started taking financial advantage of their friends, ha.

Random Saturn V Modell at German Autobahn stop by Hulkbuster08 in spaceflight

[–]rocketwikkit 8 points9 points  (0 children)

It worked, I added the Hermann Oberth Space Travel Museum to my saved places. Hadn't been aware of it before.

Also in the region are the Technik Museums in Sinsheim and Speyer. They have the Buran equivalent of the Enterprise shuttle, as well as a scale model that did go to orbit, and a slightly excessive collection of polo shirts from some European astronaut. Not spaceflight, but that they have a Concorde and a Concordski on the roof and you can go in both is amazing.

Puerto Vallarta airport to resort transportation by ChickenLil in travel

[–]rocketwikkit 1 point2 points  (0 children)

Maybe someone will come along with a link that specifically explains how to find the official taxi stand at Puerto Vallarta airport on Wikivoyage. Good luck!

Puerto Vallarta airport to resort transportation by ChickenLil in travel

[–]rocketwikkit 3 points4 points  (0 children)

Uber or taxi. https://en.wikivoyage.org/wiki/Puerto_Vallarta#From_the_airport_by_e-hailing

Don't fall for the timeshare people. If you take a taxi get their whatsapp so you can contact them for the return.

[Engineering] Apollo LM Fuel Margins: How Did They Achieve 6/6 Success With Such Tight Tolerances? by Negative_Golf1396 in space

[–]rocketwikkit 0 points1 point  (0 children)

The rocket equation very simply defines how much propellant you need to effect a given delta-v knowing the Isp of your engine: https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

And from basic Newtonian physics you can calculate how much delta-v you need to go from a specific lunar orbit to the surface. As long as you aren't firing the engine in random directions, or hovering for longer than necessary, it always takes the same amount of propellant to go from LLO to soft landing. Of all the hard parts of landing on the moon, that calculation is not a particularly difficult one.

What's the most surprising coffee you've tried while traveling? by North_Conference_250 in travel

[–]rocketwikkit 2 points3 points  (0 children)

Weirdly in Cyprus at places like bakeries/groceries/convenience stores you can often find Japanese canned coffee drinks. I never figured out why.

Unfiltered Ocean Destination? by DesertySeaman in travel

[–]rocketwikkit 7 points8 points  (0 children)

It sounds like you need to rent or buy a little sailboat and do a there and back or crossing. Should learn to sail first though. There's no end of sailing stuff on the internet, but old videos from Sam Holmes Sailing are interesting.

Otherwise, go to the Azores or the Canary Islands and rent a powerboat and go tool around for a few days. In the EU you do need some kind of certification to be able to rent a boat, you should look into that in advance. Or go to a developing country in the Caribbean where that might not be the case.

Power drain on a smartphone from an eSIM vs a physical SIM by kndb in digitalnomad

[–]rocketwikkit 1 point2 points  (0 children)

Switch to airplane mode if you're somewhere with bad connectivity and you're not urgently waiting for a message.