Comments by "kazedcat" (@kazedcat) on "" video.

@ThePrisoner881 The scary part is the tank that store all those salt water propellant. If something happens to you neutron absorbent lining. You have a spaceship size nuke.
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@nuclearmedicineman6270 You refuel with premium weapons grade propellant.
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Danilo Oliveira Let us consider a steady state operation. The mass flow rate at the nozzle exit should be equal to the mass flow in the nozzle intake. Because if not then either the mass inside the nozzle drops below critical or the mass inside is increasing causing it to explode. The mass going in is equal to the mass going out but the intake opening is smaller than the exit opening so in order to maintain the mass inside the nozzle either the intake flow velocity is faster or the intake flow is at higher pressure. The nuclear reaction is adding energy to the propellant inside the nozzle so the exit flow velocity should be faster than the intake flow velocity. That is also the main purpose of having nuclear reaction to accelerate the propellant in the nozzle. That means the intake flow velocity must be slower than the exit flow velocity so the only way that the mass inside the nozzle is maintain is to have higher pressure at the intake. Now the pressure at the nozzle exit is equal to engine thrust divided by the opening area. We know the engine have crazy high thrust so the pressure at the nozzle exit must also be crazy high this means the intake pressure must be even higher and the pump must be able to generate an even higher pressure.
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No you want all the exhaust confine in a small area to maintain criticality and burn as much uranium as possible. Also aerospike engine actually lost it's efficiency advantage in the vacuum of space.
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@MrTomyCJ I am more worried on the neutron absorbent lining on the tanks. You need them to be strong enough to survive the intense vibrations. Also the pump needed to feed the reaction nozzle needs to produce higher pressures than nozzle pressure. High pressure also brings the salt water closer to criticality so there is a limit to the size of your pump.
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@danilooliveira6580 In order to create the fuel flow you need pressure gradient from the pump to the nozzle. The direction of the flow is from high (pump) to low (nozzle) pressure. The nozzle is going to be at very high pressure near the neck to generate the high exit velocity of the propellant. The pressure at the pump will be even higher than the pressure on the nozzle neck.
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