Sereneti

a RTG is usefull for long-therm probes... and so on.. Nuklear fuel is very usefull, if its used wise... Ther are some kind of reaktor that can use the uranium witout enrichment. - they dont be used because they are expensive Ther are som kind of reaktor that have lot less waste - they arent be used, because the waste is cheap , - the staat take the cost of the waste The momentan use, its more an abuse then a good use ... a Fusion Reaktor will get the same problem... The big problem of every energy source are the greed of mankind. - a "perpetum mobile" have the same problem. A RTG can be seen as a perpetum mobile, if you dont know the reason of his heat.... A "perpetum mobile" give us free energy -> use it to ultimo -> some thing we dont know will give us the bill...

before i think about the long-therm-problems, there are enough short-therm problems to avoid that... there is one city that have huge problems after geothermie...https://de.wikipedia.org/wiki/Hebungsrisse_in_Staufen_im_Breisgau the problem is not the "not renewable", the problem is, that the mankind use a recource without thinking. if geothermie is "cheap energy" they are (ab)use it, without thinking of the problems. Fosil-fuel is a good recource. But its used without thinking. Nuklear-fuel is a good recource. But its used without thinking. and so on... if there is a "perpetum mobile", mankind will (ab)use it, too....

maybee but thats a queston of "praktikal possible" (theoereticaly he can use the intake air, to cooling himself) (and if he start, if he use his plasma-truster, all around him will start tu burn...)

i know... now... and its a big , big sleeping vulcan... Do you realy want to "touch" it?

maybe not about a perpetuum mobile, moar question like "geothermal energy... why dont we use the Yellowstone for our energy-problems..?" ore "why do they use the massive energy consuming supra-conduits, and dont use neodym-magnets for the fusion-generators"?

hm... ok, thank you i think its interresting how much energy (%) from the whole system is wasted to ionise the Xenon ... Why not it looks cool.

the probem is: somethings, like the rapier-engine are at the end of the tech tree. its like "you have to go to minnmus first, to get the tech to go to Minmus"....

now they use Xeon... and yes, the energy they used to ionise the xenon is waste.

At first they tried to use Hg , but it had react with the electronic... (Hg , liquid, light to ionise, and a lot of mass/volume)

but newtons third law: „Actioni contrariam semper et aequalem esse reactionem: sive corporum duorum actiones in se mutuo semper esse aequales et in partes contrarias dirigi.“ If i trow something with X joules away, i get of X joules back... in this case is not importan of the mass i throw away, only the energy i use to trow something away... the photon-rocket had to generate the "mass" bevore it can be trown away....

he can use the air as working mass so he only need energy He had a strong fission reactor for the energy... the suit isnt "physicaly impossible" but "impossible to create" (thats different...)

ok, that is logical... i hadnt think that ionising of xenon is so hard... ---

*nadel fallen lass* *echo vernehm*

they have achived a force of 2,5 g...

Hi In RL ion-engines do have a low trust. but, where did the energy go? If i throw a stone with 10 joule in one direction, i got an impuls of 10 joule in the other direction. A propeller with 1kw give the air the energy of 10 joule (i ingore the loos from the motor...) , and get an impulse from 10 joule in the other direction. -> generate a lot of thrust If a ion-engine have the power of 1kw, the ion engine generate much less thrust as an propeller in air... Where did the energy gone? ar all of the energy wasted to ionice the Xenon?

some tipps from me, about the reentry heat: 1) Radiators can help. But: You have to put they in the slipstream of other parts, until you reach thick enough atmosphere that the atmosphere can cool him... 2) Aerobreakes help... 3) on the way up, drag is your enemy. on the way down, drag is your friend. Weight, mass is always your enemy... Mass is carrier of kinetic energy. on the way down, you want to convert kinetic energy to heat. every gram of weight carry a lot of energy. on an LKO you have a delta v of 3200m/s , that means every gram of your vessel has the kinetic energy of 5120 joule... 4) i will make this evening a album of screenshots from reentry, if you want.

so its "good" to archive a TWR (ore a overal acceleration from 2m/s² ) ... if the twr is to low, its not possible to got into an orbit, and the flight is only a flyby.. :/ Thank you (i want to build a "proffesional" drone, not more " it works" drone, with a engine, "that weight more then the whole vessel"...)

Hi I plan to make a small Mün vehicle (only LKO to mün and back) What TWR is needet to orbit and land on the mün?

If you go to LKO first, you can use the fuel saving on the periapsis-burns...

you dont need to launch it vertical... at the moment i try to make a "low-tech-spaceplane"

i had use the mobile-prozessing-lab. Yes I dont want to reach jool, only to get a ramjet ...

Monopropelant , Hydrazin, has the best Volum/energy ratio... the puff-engine is ok, maybee a little more tech in the monopropelant-tree (like a "normal-mountet" monopropelant-engine, )

there are 2 projeckts atm... 1) build a large, heavy lifter spaceplane -> planed as a SSTO.. 2) build 2 Shuttle-booster (2 shuttles as a booster for a large tank, with a payload above...) -> the problem is, if i drop parts from the middle tank, the whole thing became unstable .... A big feature of spaceplanes: Its more easy to achive a Equatorial -LKO.... With the normal-rocket-launchpad its hard to reach it....

a probe core 1* radio-isotope generator 2*(2*3)solar-panels some science-equipment a antenna 3 small "inline" batteries a xenon tank a ion engine a smal reaction-weel yes the satelit is more expensive that it have to, but i dont regreat the ion engine+Xenon ( I often got "change the orbit of this probe" contract ...) This satelite generate les power than the engine need, but the batteries are chaching the energy. The Batteries can hold charge for ~ 100DV...

one question: Wat is an STS? i know the SSTO -> single-stage-to-Orbit But an STS? And what is a Spaceplane with Drop-tanks called?