System for receiving a descending rocket on a semisubmersible vessel using a suspended cable
Systems and methods for receiving a descending rocket, which may be at sea. The rocket may descend vertically with the nose higher than the nozzle. The rocket body may be angled as it descends. A boom arm with hooks may extend at an angle to the rocket body to engage a cable suspended by a semisubmersible platform at sea. The platform may include a dampened cable and lateral straps for securing and rotating the rocket into a horizontal orientation. The platform may receive a ship and purge water to elevate the platform for placing the horizontal rocket onto the ship.
1 . A system for receiving a descending rocket, the system comprising:
a vessel;
a cable suspended by the vessel and configured to engage an upper portion of the descending rocket and suspend the rocket therefrom; and
a strap supported by the vessel, wherein the strap is configured to stabilize a lower portion of the suspended rocket and to decrease in length to cause the suspended rocket to rotate toward a horizontal orientation, wherein the cable is configured to increase in length as the strap decreases in length.
2 . The system of claim 1 , wherein the strap is configured to stretch in response to a force applied to the strap by the suspended rocket.
3 . The system of claim 1 , wherein the vessel comprises a semisubmersible vessel at sea, the semisubmersible vessel configured to receive and purge seawater to, respectively, lower and raise the semisubmersible vessel in a vertical direction.
4 . The system of claim 1 , further comprising a first rail comprising a first end and a second end and a second rail comprising a first end and a second end, wherein ends of the strap are moveably connected to the first rail and the second rail.
5 . The system of claim 4 , wherein the cable is configured to increase in length and the strap is configured to decrease in length after the ends of the strap have moved along the first rail and the second rail.
6 . The system of claim 5 , wherein the vessel comprises a semisubmersible vessel at sea, the semisubmersible vessel configured to receive and purge seawater to, respectively, lower and raise the semisubmersible vessel in a vertical direction.
7 . The system of claim 4 , wherein the strap is configured to partially surround the lower portion of the suspended rocket when a first end of the strap moves from the first end to the second end of the first rail and a second end of the strap moves from the first end to the second end of the second rail.
8 . The system of claim 7 , further comprising a second strap supported by the vessel, the second strap configured to stabilize the lower portion of the suspended rocket.
9 . The system of claim 8 , wherein the strap is configured to apply a first force on the lower portion of the rocket in a first direction and the second strap is configured to apply a second force on the lower portion of the rocket in a second direction approximately opposite to the first direction.
10 . The system of claim 8 , wherein the second strap is configured to partially surround the lower portion of the suspended rocket when a first end of the second strap moves from the second end to the first end of the first rail and a second end of the second strap moves from the second end to the first end of the second rail.
11 . The system of claim 10 , wherein the first end of the second strap is configured to move to the second end of the first rail and the second end of the second strap is configured to move to the second end of the second rail before the strap decreases in length.
12 . The system of claim 1 , further comprising a damping system configured to dampen forces on the cable due to the upper portion of the descending rocket engaging the cable.
13 . The system of claim 12 , wherein the damping system comprises:
a spool with the cable partially wrapped thereon and configured to pay out the cable to allow the cable to lengthen; and
a piston attached to the cable and located at least partially in a sea water-filled chamber.
14 . The system of claim 1 , wherein the strap is configured to decrease in length until the rocket is in a substantially horizontal orientation.
15 . The system of claim 14 , wherein the strap is configured to increase in length and the cable is configured to increase in length to lower the rocket in the substantially horizontal orientation onto a transport ship.
16 . The system of claim 15 , wherein the vessel is configured to be maintained at a first draft as the upper portion of the descending rocket engages the cable, and wherein the vessel is configured to be maintained at a second draft as the rocket is lowered onto the transport ship in the substantially horizontal orientation.
17 . The system of claim 1 , wherein the cable is configured to engage the upper portion of the descending rocket by engaging at least one hook arranged on an arm of the descending rocket.
18 . The system of claim 17 , wherein the cable is configured to engage the at least one hook when the arm is in a non-vertical orientation relative to a body of the rocket.
19 . The system of claim 17 , wherein the cable is configured to suspend the rocket when the arm has rotated to a substantially vertical orientation relative to a body of the rocket.