Why a raft could fall upside down in the escape test
The raft's tendency to "fall upside down" was the central obstacle in the escape test. The account says attempts to use it failed because it inverted. Although it then fell at a relatively survivable speed, no human could have hoped to hang on. That distinction is essential to the answer: the account does not treat descent speed as the only condition that matters. It also describes what happened during inversion and whether attachment could be maintained. A useful reading follows the full sequence, giving the change in orientation and the difficulty of holding on as much attention as the later descent.
Begin with the failure description. The raft tended to invert itself, and the attempts failed for that reason. This is the stated cause in the test account. There is no need to invent a wind condition, a jumping height, or a particular motion before inversion to explain the finding. Those details are not supplied here. The account already provides a clear relationship between the raft's behavior and the unsuccessful attempts. Keep the explanation at that level: the raft did not maintain the orientation needed by the attempted use, and the change brought a separate problem for anyone trying to remain attached.
The phrase "fall upside down" can invite attention to the descent alone, but the account describes an important transition before that descent. It says the inversion shock ripped off Buster's arms even when ropes attached him to the center of the raft by those arms. This detail identifies the attachment arrangement used in that attempt and what happened to it. It does not provide a numerical measurement of the shock. The reported outcome is enough for the question. The attempt to secure Buster is part of the explanation, because the account still describes a failure to maintain that attachment through the inversion.
The relatively survivable speed belongs to the next part of the description. The account says the raft fell at that speed once it had inverted. It does not say the whole attempted escape was survivable. The inability to hang on remains an explicit limitation, and the attachment outcome remains part of the reported result. Reading the sequence carefully keeps those statements together. A favorable description of one part of a test need not be expanded into a favorable description of the complete attempt. Here, the account makes the distinction directly, so the explanation can retain it without offering a separate calculation.
The tendency to "fall upside down" is also separate from the special rigging described later. The account says it was possible to rig the raft as a parachute and land with minimal injuries. That is a different condition from the unsuccessful attempts already described. The distinction matters because it allows both findings to remain in the account: attempts to use the raft failed, while a specially rigged configuration could produce a landing with minimal injuries. There is no contradiction that requires an invented technical explanation. The stated change in setup is enough to distinguish the reported outcomes within the limits of the passage.
The special rigging comes with its own stated boundary. The account says it would not be possible to perform while jumping from a disabled aircraft. That limitation prevents the specially prepared result from becoming a claim about preparation during the attempted escape. A clear explanation can keep preparation and performance together: what was possible under the specially rigged condition is paired with what could not be done during that jump. The passage does not supply instructions for creating the rigging, and the question does not require them. Its answer concerns the obstacle in the attempt, rather than a procedure for reproducing a different setup.
To follow the "fall upside down" finding, organize the account by conditions rather than by a single outcome label. First consider the inversion and failed attempts. Then consider the attachment of Buster and the reported effect of the shock. Next keep the relatively survivable descent speed beside the inability to hang on. Finally place the specially rigged result beside the limitation on preparing it during a jump. This is a reading method, not an additional experiment. It makes each statement useful by preserving the condition attached to it, and it keeps a partial result from standing in for the complete sequence being described.
The phrase "fall upside down" therefore points to the main answer while the rest of the account explains its importance. Inversion made holding on impossible in the described attempts, and the rope attachment did not survive the shock as used with Buster. The specially rigged configuration produced a different reported landing outcome, with a clear limit on preparing it during an escape from a disabled aircraft. A reader can retain all of those distinctions without needing an invented measurement or a broader aviation claim. The useful lesson in reading the test is to keep orientation, attachment, descent, and preparation attached to their stated conditions.