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BigRedDog

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How soon before we see (or hear) the SR 72 flying overhead?
« on: September 30, 2017, 12:21:10 PM »

http://taskandpurpose.com/sr-71-blackbird-successor-demonstrator/

I've always been interested in the SR 71 Blackbird 'recon' plane.  The base where I was stationed was an obvious resource for it due primarily to our proximity to Czechoslovakia and East Germany at the time.
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The Fuzz

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #1 on: September 30, 2017, 02:25:24 PM »

Very interesting........I saw a documentary regarding air-frame design and engineering challenges due primarily to with the expansion and contraction of materials at altitude barometric pressures.  The technology for CAD modeling just increases by year by leaps and bounds.  I was just telling the family about watching the advancements from start to current of modeling of materials......amazing.
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BigRedDog

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #2 on: October 01, 2017, 09:28:54 PM »

Very interesting........I saw a documentary regarding air-frame design and engineering challenges due primarily to with the expansion and contraction of materials at altitude barometric pressures.  The technology for CAD modeling just increases by year by leaps and bounds.  I was just telling the family about watching the advancements from start to current of modeling of materials......amazing.

The technology...   the materials...   now the ability to print out parts...

all going to make for a much quicker turn over time for this 'bird'...

I'm guessing what hasn't changed and very well have gotten worse is the government's ability to decide they need a new plane and what it should be able to do and of course how to 'build it cheaper' ;) ;) ;)
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BigRedDog

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The Fuzz

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #4 on: October 08, 2017, 12:05:35 PM »

Just guessing, but I doubt we would see or hear them at the altitude they operate at.
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BigRedDog

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #5 on: October 08, 2017, 12:21:58 PM »

Just guessing, but I doubt we would see or hear them at the altitude they operate at.

I'm not sure how that works...   but at some point they have to be going up or down so maybe when they're not going so fast or so high!
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SidecarFlip

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #6 on: October 08, 2017, 03:23:26 PM »

The technology...   the materials...   now the ability to print out parts...

all going to make for a much quicker turn over time for this 'bird'...

I'm guessing what hasn't changed and very well have gotten worse is the government's ability to decide they need a new plane and what it should be able to do and of course how to 'build it cheaper' ;) ;) ;)

On Chinese 3D printers?
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The Fuzz

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #7 on: October 08, 2017, 05:57:49 PM »

I'm not sure how that works...   but at some point they have to be going up or down so maybe when they're not going so fast or so high!

Guessing, and strictly guessing......they probably climb to their high altitude cruising height at subsonic, then break the barrier once there.  I'm only basing that on air frame stress that I would think they would like to minimize just for longevity. 
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excelsior

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #8 on: October 08, 2017, 07:12:47 PM »

Guessing, and strictly guessing......they probably climb to their high altitude cruising height at subsonic, then break the barrier once there.  I'm only basing that on air frame stress that I would think they would like to minimize just for longevity.

The next generation plane will use a ramjet to maintain hypersonic flight.   The plane will require a first stage to achieve the speed required for a ramjet to work (about Mach 3.5).

Most think that the plane will fly at the edge of space and skip across the atmosphere like a stone skipping on water.   This thin atmosphere will reduce the stress and heat load on the structure.
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The Fuzz

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #9 on: October 08, 2017, 07:35:48 PM »

That makes a lot of sense from a Physics perspective.
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Monroe Native

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #10 on: October 08, 2017, 07:36:57 PM »

Unmanned.

What is the fun in that?
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BigRedDog

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #11 on: October 09, 2017, 10:04:08 AM »

Unmanned.

What is the fun in that?

I'll bet even in 'drone mode' it would be a lot of fun for the remote operator.  I wouldn't be surprised to see the full size version end up as an unmanned version.  Eventually they'll probably eliminate a lot of pilots in various planes.  They'll probably have an 'automatic' mode for dogfights and let a long distance operator worry about getting it from point A to point B. 
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BigRedDog

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #12 on: October 14, 2017, 08:33:36 PM »

Just guessing, but I doubt we would see or hear them at the altitude they operate at.

Sounds (no pun intended...   ok, a little one) like we can hear a sonic boom about 20 nautical miles from the origin.  I do remember hearing a space shuttle boom on re-entry from space several years ago.

Quote
Yes, a sonic boom produced at 60,000' can be heard on the ground.

First of all, a sonic boom consist in a steep increase of air pressure, followed by a slow, linear decrease below the nominal ambient pressure, and again a steep increase back to the nominal pressure. It is therefore called N-shaped wave or just N-wave. Here is a graph with several sonic booms, measures by NASA and found on Wikipedia:

It's a long article and a lot of it is in engineer speak...

https://aviation.stackexchange.com/questions/17661/can-a-sonic-boom-produced-at-60-000-be-heard-on-the-ground

They start with the Concorde at 55-60,000 ft (11 nm) and then talk about the space shuttle later.
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The Fuzz

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Re: How soon before we see (or hear) the SR 72 flying overhead?
« Reply #13 on: October 15, 2017, 07:33:29 AM »

Yea,,,,that's right.  I stand corrected.
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