aviation developments

[gf0012-aust]

The question is whether the temperatures that they are rated for in use are the same as those they're exposed to when they're made in an autoclave. Probably not.

??

nothing made in an autoclave is designed to survive in the temps that the autoclave uses once the pressing has been completed. Its not how autoclaves work

its the same principle used in manufacturing components for submarines in autoclaves

the components are designed to pass destruction tests across a range of conditions way beyond normal stress induced fighting conditions.

the multiple and disparate physical components used to make c0ckpits underdo signifcant change when they are in the autoclave - its similar to the changes that occur when carbon fibre is formed in an autoclave

 

[PhysicsMan]

??

nothing made in an autoclave is designed to survive in the temps that the autoclave uses once the pressing has been completed. Its not how autoclaves work

its the same principle used in manufacturing components for submarines in autoclaves

the components are designed to pass destruction tests across a range of conditions way beyond normal stress induced fighting conditions.

the multiple and disparate physical components used to make c0ckpits underdo signifcant change when they are in the autoclave - its similar to the changes that occur when carbon fibre is formed in an autoclave

Any idea how hot autoclaves get for these processes?

 

[gf0012-aust]

Any idea how hot autoclaves get for these processes?

400C for the F-22 which is a quad laminate and fusion bonded acrylic, poly and optical glass

no idea for F-16 which is only triple laminate polycarb

 

[PhysicsMan]

400C for the F-22 which is a quad laminate and fusion bonded acrylic, poly and optical glass

no idea for F-16 which is only triple laminate polycarb

Thanks. Within limits for what I have in mind.

 

[gf0012-aust]

Thanks. Within limits for what I have in mind.

bear in mind that the max temp that an SR71's c0ckpit glass reached was under the forming temp of the F-22 c0ckpit glass making autoclave

the temps around the canopy are not universal and evenly distributed either

 

[PhysicsMan]

bear in mind that the max temp that an SR71's c0ckpit glass reached was under the forming temp of the F-22 c0ckpit glass making autoclave

the temps around the canopy are not universal and evenly distributed either

I'm not worried about the transparent conductor layers getting exposed to high temperatures during usage - that should be fine (for optical and electrical properties as well as thermal stresses), I'm primarily concerned with the process temperatures needed to coat them. But it sounds like that should not be a major problem either.
Thanks.

 

[gf0012-aust]

I'm not worried about the transparent conductor layers getting exposed to high temperatures during usage - that should be fine (for optical and electrical properties as well as thermal stresses), I'm primarily concerned with the process temperatures needed to coat them. But it sounds like that should not be a major problem either.
Thanks.

optical transports react to heat, if you build comms transports into the c0ckpit laminates then you will witness adverse results

 

[PhysicsMan]

optical transports react to heat, if you build comms transports into the c0ckpit laminates then you will witness adverse results

They do, unfortunately, but that is a separate (or next, I should say) problem to worry about. At least one doesn't need to worry about permanent degradation of its properties.

 

[PhysicsMan]

They do, unfortunately, but that is a separate (or next, I should say) problem to worry about. At least one doesn't need to worry about permanent degradation of its properties.

Are the optical properties (light transmission) or electrical conductivity important for the reason you mentioned?

 

[gf0012-aust]

They do, unfortunately, but that is a separate (or next, I should say) problem to worry about. At least one doesn't need to worry about permanent degradation of its properties.

if the bearer is corrupted then the signal its managing is compromised - in that sense you do have a permanent degradation as you have an unintended consequence.

If there is (especially) a (tactical) decision made using that compromised dataset, then there can be severe even if unintended consequences

heat kills, no matter how benign it may seem. if the transport path suffers temp variations, then that is just as bad as an imperfectly drawn cable where the result is reflection and refraction

optical transports won't change the outcome.

 

[PhysicsMan]

if the bearer is corrupted then the signal its managing is compromised - in that sense you do have a permanent degradation as you have an unintended consequence.

If there is (especially) a (tactical) decision made using that compromised dataset, then there can be severe even if unintended consequences

heat kills, no matter how benign it may seem. if the transport path suffers temp variations, then that is just as bad as an imperfectly drawn cable where the result is reflection and refraction

optical transports won't change the outcome.

I suppose using digital transmission signals is a way to make fluctuations in signal carrier properties less relevant.

 

[gf0012-aust]

I suppose using digital transmission signals is a way to make fluctuations in signal carrier properties less relevant.

the fluctuations are usually called "jitters" - not to be confused with the acronym

 

[gf0012-aust]

roll up of major programs NAVAIR

NAVAIR Today: Weapons Programs | Defense Media Network

 

[gf0012-aust]

op-ed on using UAS as a commercial array

AT&T Testing Cell Site Drones for Disaster Recovery, Festivals and More - Telecompetitor

basically this is a low level commercial development of what I've discussed before eslsewhere in DT re using arrays of UAS as comms bearers and repeaters

note, quite a few mining companies use COWS in Australia

 

[John Fedup]

Interesting application. Can these flying COWs really get up to 400 feet while having to lift all that cable?

 

[gf0012-aust]

closest fit is this thread

be intereresting to see when she does come home...

Air Force's Mysterious X-37B Space Plane Breaks Orbital Record

 

[colay1]

Interesting application. Can these flying COWs really get up to 400 feet while having to lift all that cable?

I'd have thought a mini aerostat would offer practical advantages. Weather conditions could be an issue though.

 

[John Fedup]

Haven't heard too much lately about Reaction Engines but RR and Boeing must be paying attention as they both have made investments in the company.

Reaction Engines secures £26.5m investment from new industrial and financial investors | Reaction Engines

 

[John Fedup]

Here’s an update on Reaction Engines’ Sabre program from AW. Things seem to be progressing.

http://m.aviationweek.com/future-ae...s-sabre-rocket-engine-demo-core-passes-review

 

[Calculus]

US to go back to the moon by 2024: SpaceX is Only Option for Human Landing on the Moon by 2024 – NextBigFuture.com