magnemoe

Back in the Korean war this was standard for helicopter medevac as you could not fit an stretcher inside the two man cockpit. It was also realized giving trauma treatment during medevac significantly increased the survival chance after serious incidents. 25 years ago I studied engineering and the student dorms was previously only used by nurse student because we was next to an hospital. One spring night I woke up in shock an binding light filled the room and it was very noisy. It was an medevac helicopter using our high rise as an visual aid toward the hospital. It I had someone with something critical like an stoke I would also gone in very tactical, the students just start drinking again

Magic being something a few have is pretty common idea. Not unrealistic as in you need special properties to become an fighter pilot and its far harder to compete in the Olympics. In high fantasy like Elder scrolls there magic is common ordinary peoples like an farmers might know some healing spells and some spells to resist bandits or animals as an shield but they mostly used weapons. Its an skill thing. during WW 2 US has an benefit in that an significant faction of their recruits could fix cars. http://freefall.purrsia.com/ff300/fv00214.htm obvious Freefall reference. Yes it was an idiotic thing to add, just point device and say the force is strong in him. Do not try to explain magic or advanced just make it make sense in universe . The prequels got lots of hate but they did not try to hyperspace ram their own ass as an main strategy so end up looking good today.

This, saling ships tended to pan out at around 10.000 ton, yes its larger like SS Great Eastern and some smaller modern cruise ships. Both sail assisted. But yes sail ships was used for cargo between islands like Indonesia very late because low operational cost then crew cost was low, and you did not need large speed or high cargo capacity, just servicing the islands.

Yes, I know about the rise of slavery in Soviet Union and Germany. Now these regimes was not very rational. It also makes sense to use prisoners as labor if you have to imprison them anyway. US and UK also did this with POW, who is legal if working conditions is decent and work is not dangerous or making weapons. You would anyway be scared of the sabotaging stuff. But if they can do farm work or make simpler stuff you can put these people on making weapons. As for not rational, US slave owners did not want to use their slaves for dangerous work like mining, they could easy loose the expensive investment. So they get immigrants to do these jobs, In both Germany and Soviet prisoners dying was positive as it was people you wanted to get rid of, or they did not care at all. Germany killed millions of Soviet POW, they stopped as they needed them as slaves. More people died making V2 than got killed by them.

Agree, extended family groups was the standard social unit until 10 K years ago. Yes it was larger units but they was mostly to meet others, trade and solve conflicts. Slavery was mostly ancient, it died out in most of the world, yes you had forced labor, but much softer. Slavery got an upswing after colonization of America as it was an labor shortage. Now part of the reason slavery died out in Europe and probably other places is that slaves has an added cost, you have to hire guards to keep them in line or treat them well enough that they stay. If you can hire people cheap enough why use slaves, if you have enough hungry unemployed they are likely cheaper. Back in the bronze age wage labor was not really invented yet, you was part of the family or you was paid for an task like gig or day work, or you was an slave. Rome and some other place probably took so many slaves because their wars they became an slave economy. Taking Jerusalem after the Jew revolt paid for Colosseum. Imagine wars being profitable, expensive weapon system has multiple benefits

Yes getting into orbit orbit after flying in the atmosphere of Saturn. An nuclear ramjet switching to liquid hydrogen then atmosphere get too thin even then hypersonic is the closest tech option.

But movies has an timeline of 2 hours, so story need to be short and therefor simple. Having two grey factions is great in and multi seasons tv series or an +100 hour video game, not in an 2 hour movie. Heard lot of calls for simpler enemies. Now if you can do this if the villain motive understandable like the ship AI in Wall-E. And it was correct, returning to earth would be an hundreds of year process, humans could not survive on earth yet. The villain part was trying to keep status quo at all cost.

Yes, but you need much more oxidizer than fuel even if burning fuel rich.

Yes nuclear also has practically unlimited range. Radiation shielding is an issue, would work better on an long plane. You could simply use electricity to make heat, way less efficient than propellers, however electrical propellers might be more effective than an an turboprop if you have to bring the oxidizer because the very high efficiency of electrical engines offset lots of the low power density of batteries. Electric cars is an bad comparison, they work well as your rarely use more than an faction of the engines power.

Area is the area of the ducted fan in m^2. who is pi*r^2 =0,0177 m^2 with an 15 cm fan but plugging that into the formula gives 0,000389 tip speed should be 0.6^2 who give an even lower value 0,000234 so something is wrong here

This, and it would probably work much better with good fusion. Or if you don't care about radiation as you are on Venus or Jupiter you skip the heat exchanger, look up project Pluto, nuclear ramjet

Like the V-22 so nothing new I say, why not go for an tail sitter on a drone, fixed wings for cruise performance, propellers above and below wings for takeoff and landing. Benefit of the V-22 is that is can take off with far more than its VTOL landing load from an air strip. but its burned so much fuel it can land unload and fly back.

Yes, rocket engines are hungry. It burns even more LOX. This is the main problem with cross-feed and drop tanks, you have an flow usually only seen in hydro plants. Yes some large water handling systems might handle many ton's second but here pressure is low and bubbles and cavitation is not an issue.

Jet engines bleed air trough the turbine blades to cool them, my idea was to do this with hydrogen. And yes early jet engines just lasted some hours And jet engines are more complex in many ways as you are burning air not pure oxygen, air pressure variations and as you say environmental factors including noise, also orders of magnitude longer flight times. I'm sure its lots of engines on long distance flight who has burned for longer in an single flight than shuttle or falcon 9 engines has burned totally but jet engine then does this the next day

The rotating lower jaw one was amphibious and used by intelligent dinosaur to cut down trees and make planks. Flintstone was pretty accurate outside the humans and the pointless cars. They had everything from fast cabs to +100 ton trains pulled by the huge dinosaurs. They was expanding out of current day Mexico. They did not have an space program

Second one is just pretending, but this is nor folding, just flexible. Once we stole an plastic banner and carried on our head because it was raining, we was obviously drunk, it was flexible but not folding like an umbrella.

LEO and later the moon works better, shorter travel time and an luxury hotel both paces would be viable down the line. Multi year trips then you can not talk normally on the phone has issues if you need to be connected. Yes some people will pay for it but it would not bankroll the operation like orbital and moon hotels. You then attach the research to the hotels as its cheaper anyway, And you get to run on water on a pool on the moon.

Yes jet engines run lean on 20% oxygen in the atmosphere. Rocket engines uses lox and fuel, mixed together, great care has to be taken to not melt the chamber. Putting an turbine in there is idiotic hard. All turbo pumps is inefficient by design as you can not run them like rocket engines as you melt the turbine and this is just to power the pumps. Now you could have the inefficient burned mix feed into the engine chamber, eliminating the loss if you can handle the higher pressure. Obviously if you could run an turbo pump as an rocket engine you could just use it as an smaller rocket engine at the side who would be much easier but still very hard as none has done it. Now you might pull this off on an smaller hydrolox turbo pump, burn it oxygen rich, use LH2 to cool the turbine by pumping it trough blades for cooling, then an second chamber before the nozzle and exhaust is fuel rich. You can use this for roll control and does not get usual open cycle losses even if open cycle. Its not something SpaceX would make.

This, it's probably easier to see on an rapid rotating airless body. Now one weird effect in KSP is that if you shoot an rocket straight up say 10 km it will come down west of launch point. This is probably simply that Up in orbital view counter the rotation.

Get it but we docked for half an century now and has it ever been issues outside the pre Apollo learning experiences and the Mir crash? Having to move back and retry is like an turnaround on landing. Has any mission failed to dock? Outside of launch fails and starliner who did not reach correct orbit?

You might want to use Orion as it will return from moon orbit Moonship will stay in lunar orbit. But you launch it on an cheaper platform than SLS. I would also not use an full size starship for the Moonship at least not all the length of the crew compartment if crew is only 4-7 people. 2 full decks in addition to the cargo hold would give all private cabins and have space for an lab and a workshop.

Now Musk is correct in making us an multi planetary species, the problem is that this is ++100 year in the future, its not something he can do, making mining on the moon and asteroids to expand the starling fleet makes more sense today. If we had an second planet with life who we was a bit unlucky with, becoming an multi planetary species would be much easier. This let you bypass lots of the late filters. Now Homo sapiens will go extinct as the Neanderthal did, you want radical life extension and other obvious fixes. If you can not get them you want them for your kids. If it require an species change its not an problem. The n you uplift cats, dogs and bears because you could.

Was in Morocco some years ago, solar hot water systems was everywhere from out rental apartment to farms. Morocco is unlikely to run out of sun.

Now its an argument of lowering trust rater than shutting down engines later on. But rocket engines burn for short time compared to jet engines who might burn over half the time daily for years. Who is true for passenger planes but not for fighter jets, they are much more highly stressed and need more maintenance.

I agree, that was a bit weird, rather have an elevator and couple of cranes to get people up as an backup. Use the ball suits as an backup if the backup suits failed. And with an deck or two you will have workshops who likely fix failed suits or equipment. Primary purpose of space is damage control we divided it up into living quarters until we need damage control.