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Nice
You people are too funny - designing Space-X's SH booster catcher for them! I hope Elon's paying attention here.
I'm not thinking a cradle, that would be one arm.
I'm envisioning two independent arms that each pivot and cover a near 180 degree region extending out their length. (90 degrees to tower being ideal).
They track the booster's entry and swing into position as it passes by.
Black: tower
Blue: arms
Orange: capture area
View attachment 622895
Not really any tolerances, critcal parameters are arm manuvering speed and accuracy versus booster lateral speed.
Optionally, the fins can move to an angled downward position to grab the arms and tuck them in. Other pair should be folded for clearance.
For fun, imagine holding the rocket by all four points for launch. Can then be high off the ground, and the base never needs to support a fully fueled rocket stack. The vertical actuators can even add delta-v at launch.
A small initial vertical throw upwards seems like a good idea, just getting the mass moving.
Yeah, it's added complexity, but if the arms already have the actuators due to the landing system, it would boost payload. The rocket is least efficent on a fuel to delta-v metric at launch.FWIW I think the KISS approach probably rules out ground based motion. Providing any appreciable external energy into a fully fueled launcher seems a complicated proposition. I think this one is analogous to SpaceX using Starship as a moon/mars lander instead of adding complication with additional vehicles.
Yeah, it's added complexity, but if the arms already have the actuators due to the landing system, it would boost payload. The rocket is least efficent on a fuel to delta-v metric at launch.
The travel is a limiting factor, but with 50m of motion, at 1G (same as static loading, engines provide net acceleration, so could be as simple as a counter weight) it would provide 31m/s of boost or 112 kph.
I've had the mind game of using a pully and counter weight system to lanuch rockets with >1G acceleration using a tunnel in/ on a tall mountain for launch rail support. A counterweight 8x the rocket mass and a 2:1 mechanical (dis)advantage (so pulley output of 4x) gives a 3 G acceleration (I think). But I digress (even further).
Yeah, because I'm also thinking of the arms traversing that far on the landing catch. Basically make contact early and then lock at 0 velocity.You're thinking 50m of motion!?!?
So you're thinking a mostly/fully passive thing? Interesting...that would be a little less complicated. I guess the major factor would be designing the thing to abort a big ass rocket moving at 112kph?
Also could use fans to minimize the air column in a tunnel...though...maybe the impact of hitting the atmosphere at the end of the tunnel would cause some problems.
Given my extreme laziness what's the benefit of 31m/s in vertical velocity? I guess one would wag the nominal energy required to get to orbit and then 1/2mv2 a 0th order fractional energy offset from the huck-o-gizmo?
Given my extreme laziness what's the benefit of 31m/s in vertical velocity? I guess one would wag the nominal energy required to get to orbit and then 1/2mv2 a 0th order fractional energy offset from the huck-o-gizmo?
The rocket equation is cruel, particularly when combined with gravity losses. Saturn V used up 8% of its fuel just clearing the tower. So a little boost at launch can go a long way. It still may not be worth the added complexity, but I bet they've done the math. If the arms are reliable enough to catch the booster, they're probably reliable enough to throw it (or rather, to give it some assist on launch; even a 10% effective weight reduction is huge during the first few seconds).
Stunning statistic.Saturn V used up 8% of its fuel just clearing the tower