Should we worry about those seawater intrusions that have bugged the Dragon V1 on some landings? Doesn't sound good...:/ How is it even getting in?
Why worry. Crewed Dragon won't land on water.Quote from: Darkseraph on 09/25/2014 03:39 pmShould we worry about those seawater intrusions that have bugged the Dragon V1 on some landings? Doesn't sound good...:/ How is it even getting in?
Quote from: kevinof on 09/25/2014 03:50 pmWhy worry. Crewed Dragon won't land on water.Quote from: Darkseraph on 09/25/2014 03:39 pmShould we worry about those seawater intrusions that have bugged the Dragon V1 on some landings? Doesn't sound good...:/ How is it even getting in?It must be certified to be able to land in water. Also, in the most extreme possible launch conditions (ie the abort). As well any return from orbit that has to take place on an emergency basis the likely hood is a water landing.
Quote from: Darkseraph on 09/25/2014 03:39 pmShould we worry about those seawater intrusions that have bugged the Dragon V1 on some landings? Doesn't sound good...:/ How is it even getting in?The water ingress would not be into the pressure vessel itself, for obvious reasons, so it must be either into volumes that are exposed to vacuum in orbit, lying between the pressure vessel and the outer casing, or into empty tanks with an open path between them and the water.The designers would surely have known about the first case and allowed for it, so it must be the second case. One possible path for water to enter would be through a Draco rocket nozzle, past an open or partly open injector and valve and into one of the hypergolic propellant tanks.If it had only happened once, I would think that it was an error in procedures where somebody forgot to close the valve after the tank emptied, but since it appears to have happened several times, I'm guessing that it might be a design or manufacturing flaw with the valves, where they do not fully close as commanded when there is significant water pressure on the downstream side of the valve.
Quote from: Mongo62 on 09/25/2014 04:42 pmI'm guessing that it might be a design or manufacturing flaw with the valves, where they do not fully close as commanded when there is significant water pressure on the downstream side of the valve.All incorrect. Water was in the pressurized cargo area. Yes, there should be concern
I'm guessing that it might be a design or manufacturing flaw with the valves, where they do not fully close as commanded when there is significant water pressure on the downstream side of the valve.
They're called "cracks". Slamming an object into the ocean at high speeds tends to make them.
Quote from: QuantumG on 09/25/2014 09:54 pmThey're called "cracks". Slamming an object into the ocean at high speeds tends to make them.nope, not cracks. But I am not at liberty to say. keen eyed folks might figure out near the end of the current flight.
Those valves and the fact that last time due to rough seas, the capsule was towed to port. So it had waves and the water had the pressure generated by the tow. Nothing like what would happen to a crewed flight.