- Thread starter Ross365
- Start date
addjunkie
Forum Supporter
- Messages
- 12,386
- Location
- Northumberland. Reet oot in the sticks
Not always the first step jobs are hard fought for, they only want the best when they start on 100k plus.
Ross365
Member
- Messages
- 1,859
- Location
- UK
From what I can find out, all the thrusters on Starliner (there are 3 different types) are made by the prestigious Aerojet company. They have been around since WWII and were 'front and centre' during the 1960's space race. Details of what has gone wrong are are to find. However, it seems that the the problem is with a type of thruster used only the crew capsule (and not the service module) which may not to have been used before. They are relative small by the standards of rocket engines (25LBS,100N thrust). In the past the valves used to control the flow of propellant to similar thrusters were invariably simple solenoid valves but this time (unusually?) they are using pneumatic pilot valve, which is activated by a solenoid valve. The pneumatic side is operated by the same helium supply that expels propellant from the tanks. A guy at NASA on Youtube described the leak as being related to a disc about the size of a shirt button - I suspect he means an O ring.
Curiously, Aerojet was taken over by some huge US conglomerate called "L3Harris"
sometime in the last year or two, though you'd have to suspect that the plan to use this new thruster goes back ~10 years?
Curiously, Aerojet was taken over by some huge US conglomerate called "L3Harris"
sometime in the last year or two, though you'd have to suspect that the plan to use this new thruster goes back ~10 years?
Seadog
Save the planet. It's the only one with rum!
- Messages
- 12,104
- Location
- NE London - UK
I think that you mean hydrogen.
Brad93
Member
- Messages
- 18,324
- Location
- Essex, United Kingdom
nope helium.
hydrogen has a larger atomic radius.
Helium is noble remember, not diatomic
daleyd
Member
- Messages
- 10,053
- Location
- Wrexham, North Wales
helium is even leakier apparently - hydrogen, although atomically it’s smaller, attaches quite readily to other “stuff”, whereas helium doesn’t.
Dave-sparks
Member
- Messages
- 647
- Location
- Woking
Helium is the smaller atom.
Ross365
Member
- Messages
- 1,859
- Location
- UK
If you look at the attached technical report, page 4, it seems to show that in polymers, H2 is the most permeable in some materials and He most permeable in other materials. The study did not include metals.
Of course in Starliner, it seems they have leaks, not just permeation.
Of course in Starliner, it seems they have leaks, not just permeation.
Greeves246
Member
- Messages
- 1,201
- Location
- Cheshire uk
Musk gets everywhere. The ISS must be the only pile of scrap that the travelling community can’t pinch.
Elon Musk's SpaceX contracted to destroy retired space station
The California-based company will build a "tugboat" to execute the end-of-life disposal of the ISS.
www.bbc.co.uk
daleyd
Member
- Messages
- 10,053
- Location
- Wrexham, North Wales
Sorry yes you are of course correct it’s smaller in size, I was referring to atomic weight.
roofman
Purveyor of fine English buckets and mops
- Messages
- 12,156
- Location
- North West with water on 3 sides
Now how would i of guessed you would of took offense to a tongue in cheek post,First off how dare you gender stereotype me.
In all seriousness, you don't know me, you don't know anything about me except for the waffle I post here. How does my obsession with recycling, upcycling and "making do" determine whether or not I am allowed to express an opinion?
As for the plastic bags, why didn't you say something when I posted my plans before I did the work? Genuine question.
I would estimate these posts are good for 10-20 years. Are you saying if I'd used plastic bags they would last 100 - 200 years?
i have absolutely no interest in knowing anything about you past or present except your waffle here. Where did i say or post that you are not allowed to express an opinion? plus what has your obsession with recycling just like mine have anything to do with anything i posted 
. Chill out and learn to divide the internet from real life, maybe then you might realize that not everything you post is right or factual and can be questioned without a "hate reply"
Screwdriver
Member
- Messages
- 10,519
Where is the "irony" of a man with his "4 foot posts in a concrete bag" commenting on "these big earners".
Those particular big earners are exactly the types who are watching Boeing flush its formerly high value reputation down the toilet. They're still getting "bonuses" while the doors are falling off, the autopilot is driving planes into the ground and whatever their next excuse is for launching a leaky spaceship.
I judge a man by the content of his character, not the content of his wallet. I don't care how much someone earns, I am much more interested in whether or not they're any good. And by my metric, with Post Office staff being hounded to death, banks going broke and cap in hand to the taxpayer, water companies dumping raw sewage into the environment and the DEI/ESG nonsense that is dragging Boeing into the mud - I really don't see how on earth these people are allowed to hand themselves such massive "bonuses".
Perhaps I could be more relaxed about such shenanigans if they were more honest about things, didn't try to take us for fools and just called it a tax avoidance scam.
500e
Always buy fire insurance a flood is a hard start
- Messages
- 8,886
- Location
- South West
Boeing Sanctioned for Sharing Non-Public Investigative Information With Media on 737 Max 9 Door Plug Investigation
The National Transportation Safety Board announced a series of restrictions and sanctions on Boeing after the company blatantly violated NTSB investigative regulations–and Boeing...
www.aviationpros.com
Greeves246
Member
- Messages
- 1,201
- Location
- Cheshire uk
Is it better than being stuck at London Euston waiting for a cancelled train?
They went to space for eight days - and could be stuck until 2025
Two American astronauts face the sudden prospect of spending Christmas and New Year in space.
www.bbc.co.uk
Screwdriver
Member
- Messages
- 10,519
They were scheduled for 8 days and been stuck up there now for two months. What's worse, just before launch, Boeing decided they wanted to ship some extra equipment up there so they removed the pilots personal baggage allowance. That is all of their spare clothing and personal effects, all they have is what they were wearing and have now been wearing for two months.
There are no clothes washing facilities on the ISS.
There are no clothes washing facilities on the ISS.
