Quote from: Lars-J on 02/14/2022 03:08 pmIt also mentions that the entire capsule will be depressurized, so the other two crew will wear the IVA suits and remain inside. So there won't be an EVA airlock that replaces the cupola/hatch, it seems.Are IVA suits, erm, suitable for several hours in an unpressurized environment? The IVA crew would have to remain seated with severely restricted mobility while the pressure bladders are inflated, enough to operate the control console with significant effort but not much more. At the end of the spacewalk, the EVA crew would have to close the hatch and conduct any physical leak check procedures without assistance from the IVA crew. At least give the IVA crew a hot-mic mode for the intercom so they don't get sore thumbs from having to operate the push-to-talk button all day in pressurized gloves. Space-to-ground they'll just have to deal with it.
It also mentions that the entire capsule will be depressurized, so the other two crew will wear the IVA suits and remain inside. So there won't be an EVA airlock that replaces the cupola/hatch, it seems.
From the press conference - EVA suit not yet started but will be a combination of EVA and launch suit. EVA will be through the forward hatch with no airlock.
Quote from: butters on 02/14/2022 04:04 pmQuote from: Lars-J on 02/14/2022 03:08 pmIt also mentions that the entire capsule will be depressurized, so the other two crew will wear the IVA suits and remain inside. So there won't be an EVA airlock that replaces the cupola/hatch, it seems.Are IVA suits, erm, suitable for several hours in an unpressurized environment? The IVA crew would have to remain seated with severely restricted mobility while the pressure bladders are inflated, enough to operate the control console with significant effort but not much more. At the end of the spacewalk, the EVA crew would have to close the hatch and conduct any physical leak check procedures without assistance from the IVA crew. At least give the IVA crew a hot-mic mode for the intercom so they don't get sore thumbs from having to operate the push-to-talk button all day in pressurized gloves. Space-to-ground they'll just have to deal with it.Yes, they are rated for several hours of use, as they would need to handle at least that in the event of a depressurization event in orbit.
Seems like an aggressive timeline to launch at the tail end of this year with an EVA suit that is "not yet started". Can only imagine it's going to be a LOT like the existing suit with an already scoped set of functionality changes that are relatively minimal. Presumably they already have movement data from the existing flight suits in full or close to full vacuum as part of their qualification.
Quote from: kevinof on 02/14/2022 04:28 pmFrom the press conference - EVA suit not yet started but will be a combination of EVA and launch suit. EVA will be through the forward hatch with no airlock.Do you have a link to the press conference?
Quote from: abaddon on 02/14/2022 04:34 pmSeems like an aggressive timeline to launch at the tail end of this year with an EVA suit that is "not yet started". Can only imagine it's going to be a LOT like the existing suit with an already scoped set of functionality changes that are relatively minimal. Presumably they already have movement data from the existing flight suits in full or close to full vacuum as part of their qualification.What makes you think that they haven't started?
Quote from: whitelancer64 on 02/14/2022 04:29 pmQuote from: butters on 02/14/2022 04:04 pmQuote from: Lars-J on 02/14/2022 03:08 pmIt also mentions that the entire capsule will be depressurized, so the other two crew will wear the IVA suits and remain inside. So there won't be an EVA airlock that replaces the cupola/hatch, it seems.Are IVA suits, erm, suitable for several hours in an unpressurized environment? The IVA crew would have to remain seated with severely restricted mobility while the pressure bladders are inflated, enough to operate the control console with significant effort but not much more. At the end of the spacewalk, the EVA crew would have to close the hatch and conduct any physical leak check procedures without assistance from the IVA crew. At least give the IVA crew a hot-mic mode for the intercom so they don't get sore thumbs from having to operate the push-to-talk button all day in pressurized gloves. Space-to-ground they'll just have to deal with it.Yes, they are rated for several hours of use, as they would need to handle at least that in the event of a depressurization event in orbit.I understand they are rated to be safe for several hours inflated in an unpressurized capsule, that the crew would not die, but I'm inquiring about what kind of role they'll be physically able to play in supporting the EVA, besides sitting still and staying alive.
AndGillis: For Polaris, "the suit that we're going to be designing will be a single suit that we would launch and then similarly use for the EVA." https://twitter.com/thesheetztweetz/status/1493273907251621891?t=2R7ePFRAYty_xqfCp6Y-bA&s=19
The aspect of the EVA is most intriguing to me. If dragon doesn’t have an airlock (which obviously it doesn’t), I would figure they could launch an expendable airlock module docked to it, or depress the capsule and exit from the hatch. Guess they could even launch another dragon and use that as an airlock. Will be fun to watch unfold!
