I can't imagine what it'd take to thump those things upwards.

They would have more general overall utility to humanity than SLBMs that can only kill.
 
I can't imagine what it'd take to thump those things upwards.

They would have more general overall utility to humanity than SLBMs that can only kill.
not true.
a. older SLBM's are used as sounding rockets and target launchers.
b. 260" has no utility
 
I can't imagine what it'd take to thump those things upwards.
A gas generator that makes roughly the total stack weight in thrust for a fraction of a second, if I understand the basics correctly.

Which sounds terrifying but isn't that bad since you use a superexpansion rocket nozzle to get the temps and pressures down.
 
A gas generator that makes roughly the total stack weight in thrust for a fraction of a second, if I understand the basics correctly.
You presumably need to exceed the stack weight, that being how physics works, and provide enough energy to lob the thing out of the silo to whatever height you've deemed safe for main stage ignition. It's presumably similar to an interior ballistics calculation.
 
You presumably need to exceed the stack weight, that being how physics works, and provide enough energy to lob the thing out of the silo to whatever height you've deemed safe for main stage ignition. It's presumably similar to an interior ballistics calculation.
That "enough energy to lob the thing clear" part usually comes from further expanding gasses continuing to push.

I'd also assume that it's basically an interior ballistics calculation.

The gas generators for a Trident are about the size of a water heater. So yes, whatever you'd need for a 260" monster rocket would be a lot bigger than that, but mostly in terms of diameter not length. So, more like a hot tub full of solid rocket fuel instead of a water heater.
 
Doable then.

I'd like at least 4 in Florida for asteroid intercept, with warheads that can be swapped out below ground in case of another Oumuamua...a small probe and upper stage.
 
The words "Florida" and "below ground" do not belong together. If you want some form of underground basing, do it somewhere where the water table is lower.
 

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