Author Topic: Hermeus hypersonic plane  (Read 34638 times)

Offline gtae07

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Re: Hermeus hypersonic plane
« Reply #20 on: 08/11/2020 11:30 am »
BTW a quick look at biz jets shows only the Embraer Lineage and Boeing and Airbus models have room for more than 10 passengers. Everything else is 10 or less. So in addition to being a FOAK passenger carrying M5 aircraft it is also a large FOAK aircraft in its class.

Umm, no.  There are plenty of business jets that can accommodate more than that.  The thing with business jets, particularly the larger ones, is that what they can accommodate, and what they are actually equipped for, are often pretty different, especially as you get into the larger sizes.  If you come across a bizliner (one of those Boeing/Airbus ones, or the E-170/E-190 derivative Embraers) that's truly only equipped for 19 passengers, you're looking at separate full-size bedrooms, showers, and a lot of open floor space.

Something in the Global series or a large-cabin Gulfstream, for example, has plenty of room to fit 19 seats, and there are some equipped up to that level.  But you won't typically find them actually equipped for that; the largest models tend to fit other amenities like divans (basically a couch), extra-wide seats, credenzas with pop-up entertainment systems, separate pilot rest quarters, even bedrooms or showers.  More common is in the 12-16 passenger range, for aircraft in this size class.  You can see images of typical seating arrangements just searching by something like "(model) seating"; manufacturers will show examples and charter operators will often post their cabin configurations so their potential customers can see what the options are.

19 passengers is also one of those regulatory "magic numbers".   If you can carry more than 19 passengers, you're required to have a flight attendant.  That's why so many business aircraft are limited to that number, and it's why small commuters like the Beech 1900 have that limit as well.

Offline john smith 19

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Re: Hermeus hypersonic plane
« Reply #21 on: 08/11/2020 01:32 pm »

Umm, no.  There are plenty of business jets that can accommodate more than that.  The thing with business jets, particularly the larger ones, is that what they can accommodate, and what they are actually equipped for, are often pretty different, especially as you get into the larger sizes.  If you come across a bizliner (one of those Boeing/Airbus ones, or the E-170/E-190 derivative Embraers) that's truly only equipped for 19 passengers, you're looking at separate full-size bedrooms, showers, and a lot of open floor space.
Yes those are the 3 I saw that were up front about being able to do 19 passengers.

Otherwise that leaves the POTUS sleeping in his seat. Not really the image you want to project when people hear the phrase "Air Force One," is it?

It's a sub regional airliner but that's still huge for a FOAK M5 aircraft, given the next one down is the X15.

MCT ITS BFR SS. The worlds first Methane fueled FFSC engined CFRP SS structure A380 sized aerospaceplane tail sitter capable of Earth & Mars atmospheric flight.First flight to Mars by end of 2022 2027?. T&C apply. Trust nothing. Run your own #s "Extraordinary claims require extraordinary proof" R. Simberg."Competitve" means cheaper ¬cheap SCramjet proposed 1956. First +ve thrust 2004. US R&D spend to date > $10Bn. #deployed designs. Zero.

Offline Robotbeat

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Re: Hermeus hypersonic plane
« Reply #22 on: 08/11/2020 01:47 pm »
The Marine Force One (depending on model) helicopter only has like 12-20 seats. So being smaller isn’t a showstopper for Presidential use.
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Offline Asteroza

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Re: Hermeus hypersonic plane
« Reply #23 on: 08/12/2020 04:03 am »
Someone mentioned 19 is the magic number so TSA doesn't require fancy inspections?

Offline john smith 19

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Re: Hermeus hypersonic plane
« Reply #24 on: 08/12/2020 07:10 am »
Someone mentioned 19 is the magic number so TSA doesn't require fancy inspections?
Surely baggage inspection is for little people?

Although keeping nice things out of the hands of the Thieves Support Association is probably a good idea in general.

Still wondering how they will solve the cooling issues.

TA Hempellheimers book on hypersonics wasn't called "Surviving the Heat Barrier" for nothing.  :(
« Last Edit: 08/12/2020 07:12 am by john smith 19 »
MCT ITS BFR SS. The worlds first Methane fueled FFSC engined CFRP SS structure A380 sized aerospaceplane tail sitter capable of Earth & Mars atmospheric flight.First flight to Mars by end of 2022 2027?. T&C apply. Trust nothing. Run your own #s "Extraordinary claims require extraordinary proof" R. Simberg."Competitve" means cheaper ¬cheap SCramjet proposed 1956. First +ve thrust 2004. US R&D spend to date > $10Bn. #deployed designs. Zero.

Offline john smith 19

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Re: Hermeus hypersonic plane
« Reply #25 on: 08/14/2020 06:16 am »
Hermeus got some kind of SBIR grant for some of their earlier work. Some time in the last 1-2 years I think.

I wonder what the best way to look for what their submission would be? Company name? Principle investigators?
[EDIT
Had a bit of a nose around the SBIR database and found this  and this

In contrast the Hermeus founders only show up on some awards for general hypersonic design study work.

It looks like the key stuff is (or was) being done by "Advanced Cooling Technologies" PA for precooler design, who were going to license the tech to GoHYpersonic. May have done so.

I'm not sure if there's a delay on releasing current year SBIR reports but I don't think so.

I think REL might have a case for patent infringement based on the description of the precooler work as well.  ]
« Last Edit: 08/14/2020 07:07 am by john smith 19 »
MCT ITS BFR SS. The worlds first Methane fueled FFSC engined CFRP SS structure A380 sized aerospaceplane tail sitter capable of Earth & Mars atmospheric flight.First flight to Mars by end of 2022 2027?. T&C apply. Trust nothing. Run your own #s "Extraordinary claims require extraordinary proof" R. Simberg."Competitve" means cheaper ¬cheap SCramjet proposed 1956. First +ve thrust 2004. US R&D spend to date > $10Bn. #deployed designs. Zero.

Offline Seamurda

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Re: Hermeus hypersonic plane
« Reply #26 on: 08/16/2020 01:02 am »
Hermeus got some kind of SBIR grant for some of their earlier work. Some time in the last 1-2 years I think.

I wonder what the best way to look for what their submission would be? Company name? Principle investigators?
[EDIT
Had a bit of a nose around the SBIR database and found this  and this

In contrast the Hermeus founders only show up on some awards for general hypersonic design study work.

It looks like the key stuff is (or was) being done by "Advanced Cooling Technologies" PA for precooler design, who were going to license the tech to GoHYpersonic. May have done so.

I'm not sure if there's a delay on releasing current year SBIR reports but I don't think so.

I think REL might have a case for patent infringement based on the description of the precooler work as well.  ]

I don't think that the general concept of precooling will be protected and if it ever was those patents would have expired.

Most of patents REL had were around frost control on designs which they aren't actually using anymore as they aren't liquifying the air anymore.

Offline john smith 19

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Re: Hermeus hypersonic plane
« Reply #27 on: 08/16/2020 07:02 am »
Most of patents REL had were around frost control on designs which they aren't actually using anymore as they aren't liquifying the air anymore.
They never were.  Not liquifying the air was one of the major REL innovations about SABRE.

I'm actually thinking about the shape of the HX and the airflow through it.

MCT ITS BFR SS. The worlds first Methane fueled FFSC engined CFRP SS structure A380 sized aerospaceplane tail sitter capable of Earth & Mars atmospheric flight.First flight to Mars by end of 2022 2027?. T&C apply. Trust nothing. Run your own #s "Extraordinary claims require extraordinary proof" R. Simberg."Competitve" means cheaper ¬cheap SCramjet proposed 1956. First +ve thrust 2004. US R&D spend to date > $10Bn. #deployed designs. Zero.

Offline CameronD

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Re: Hermeus hypersonic plane
« Reply #28 on: 08/18/2020 07:31 am »
Came across an interesting interview with Gene Holloway of Aerion talking about biz jets, their supersonic plane, sonic booms over land and how they plan to deal with it.  Dynamically modelling the atmosphere in front and using inversion layers to reflect the boom is something I've not heard of before..

https://newatlas.com/aircraft/aerion-interview-as2-supersonic-business-jet/
With sufficient thrust, pigs fly just fine - however, this is not necessarily a good idea. It is hard to be sure where they are
going to land, and it could be dangerous sitting under them as they fly overhead.

Offline john smith 19

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Re: Hermeus hypersonic plane
« Reply #29 on: 09/21/2020 08:12 pm »
Came across an interesting interview with Gene Holloway of Aerion talking about biz jets, their supersonic plane, sonic booms over land and how they plan to deal with it.  Dynamically modelling the atmosphere in front and using inversion layers to reflect the boom is something I've not heard of before..

https://newatlas.com/aircraft/aerion-interview-as2-supersonic-business-jet/
To put this in perspective. M5 (with M1 at 340 m//s) is about 588 micro seconds/metre.
Now that's plenty of time for modern processors to calculate what changes would need to be made but then you have the mechanical time constants of how long any sort of throttle or flight control needs to react to make an observable change.

Obviously if you're looking at an air layer 100m in front of the nose, rather than 1m you have a great deal more time to do whatever it is they are planning to do.

Might work, might not. Time will tell.
MCT ITS BFR SS. The worlds first Methane fueled FFSC engined CFRP SS structure A380 sized aerospaceplane tail sitter capable of Earth & Mars atmospheric flight.First flight to Mars by end of 2022 2027?. T&C apply. Trust nothing. Run your own #s "Extraordinary claims require extraordinary proof" R. Simberg."Competitve" means cheaper ¬cheap SCramjet proposed 1956. First +ve thrust 2004. US R&D spend to date > $10Bn. #deployed designs. Zero.

Offline Asteroza

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Re: Hermeus hypersonic plane
« Reply #30 on: 11/09/2021 11:57 pm »
https://twitter.com/hermeuscorp/status/1458118805482266630

https://twitter.com/thesheetztweetz/status/1458119784185348103

Looks like Hermeus did a dog and pony show of their Quarterhorse vehicle. The showed what appears to be a dev engine running with a pretty afterburner shot, but the overall vehicle seems to be lacking certain parts like flight controls, so a partial mockup perhaps?

Offline RonM

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Re: Hermeus hypersonic plane
« Reply #31 on: 11/10/2021 02:05 am »
The tail number N60304 is not assigned. A test vehicle would need a tail number registered with the FAA. Must be a mockup or something put together to impress the investors.

Offline edzieba

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Re: Hermeus hypersonic plane
« Reply #32 on: 11/10/2021 10:43 am »
The tail number N60304 is not assigned. A test vehicle would need a tail number registered with the FAA. Must be a mockup or something put together to impress the investors.
Not assigned to an aircraft, but is currently reserved and assigned to Hermues' founder. Could simply be pending a database update.

Offline gtae07

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Re: Hermeus hypersonic plane
« Reply #33 on: 11/10/2021 07:07 pm »
The tail number N60304 is not assigned. A test vehicle would need a tail number registered with the FAA. Must be a mockup or something put together to impress the investors.
Not assigned to an aircraft, but is currently reserved and assigned to Hermues' founder. Could simply be pending a database update.

You can reserve an N number without assigning it to a specific airframe.  I have a tail number reserved for my airplane but haven't yet registered it as I'm not done building it yet.

Offline RonM

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Re: Hermeus hypersonic plane
« Reply #34 on: 11/10/2021 07:32 pm »
The tail number N60304 is not assigned. A test vehicle would need a tail number registered with the FAA. Must be a mockup or something put together to impress the investors.
Not assigned to an aircraft, but is currently reserved and assigned to Hermues' founder. Could simply be pending a database update.

You can reserve an N number without assigning it to a specific airframe.  I have a tail number reserved for my airplane but haven't yet registered it as I'm not done building it yet.

It's already past the renewal date (09/23/2020) and purge date (10/30/2021).

Offline SciNews

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Re: Hermeus hypersonic plane
« Reply #35 on: 11/11/2021 07:49 am »
"Hermeus Goes Full Throttle At Unveil Of Quarterhorse Prototype"
https://www.hermeus.com/blog-quarterhorse-unveil
Quote
While this Quarterhorse prototype was not designed to fly, it is much more than just a showpiece. Building this vehicle was an exercise in multidisciplinary design, manufacturing, and the integration of complete systems.

Offline Robotbeat

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Re: Hermeus hypersonic plane
« Reply #36 on: 11/11/2021 01:36 pm »
I noticed a lot of Brass watching that unveiling.

Clearly a major source of future funding and/or customers are the military.
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Offline CameronD

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Re: Hermeus hypersonic plane
« Reply #37 on: 11/11/2021 09:11 pm »
"Hermeus Goes Full Throttle At Unveil Of Quarterhorse Prototype"
https://www.hermeus.com/blog-quarterhorse-unveil
Quote
While this Quarterhorse prototype was not designed to fly, it is much more than just a showpiece. Building this vehicle was an exercise in multidisciplinary design, manufacturing, and the integration of complete systems.

{emphasis mine} They're also calling it a "full-scale prototype".  Even if they did only have "4 months" to build it, the build quality of that (better they call it a "mock-up" than a full scale prototype)..object is so stunningly poor I'm amazed they're not embarrassed to show it in public and especially to the military!   What did they make it out of?? Cardboard and tacks?!??  That thing must be an insult to aerospace engineers everywhere.  :o

Although I must admit it's the prettiest jet engine test stand I've seen in a while.
« Last Edit: 11/11/2021 09:28 pm by CameronD »
With sufficient thrust, pigs fly just fine - however, this is not necessarily a good idea. It is hard to be sure where they are
going to land, and it could be dangerous sitting under them as they fly overhead.

Offline webdan

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Re: Hermeus hypersonic plane
« Reply #38 on: 11/11/2021 09:18 pm »
No shock diamonds? Didn't look too tied down either.

Offline CameronD

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Re: Hermeus hypersonic plane
« Reply #39 on: 11/11/2021 09:22 pm »
No shock diamonds? Didn't look too tied down either.

Don't worry, if they bolted those hefty foot-pads to the concrete, that thing ain't going anywhere  ;D
 
With sufficient thrust, pigs fly just fine - however, this is not necessarily a good idea. It is hard to be sure where they are
going to land, and it could be dangerous sitting under them as they fly overhead.

 

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