The suborbital space tourism industry is on life support

MilanKraft

Ars Tribunus Angusticlavius
6,875
Is anyone surprised?

I know there are more traditional economic factors at play (described in article), but whether talking about the Virgin flights, BO Flying Penis flights — I'm certain there's a bad joke here somewhere — the overall concept was a gimmick for the super-rich and well-connected to start with IMHO. Most likely the novelty of the idea is wearing off and thus the willingness to pay drying up? I don't know for sure, but from where I sat, gimmick was exactly the right word. More or less like an upgraded, corporate version of taking a ride on the Vomit Comet.
 
Upvote
19 (34 / -15)
There's a reason why Jeff Epstein's circle of contacts was a thousand or so people world wide. Because the number of high net worth individuals in the entire world is very small. Consequently, it isn't hard for someone, once introduced to that creche of society, to know everyone worth knowing about.

What does Epstein have to do with space tourism?

His circle of contacts (not necessarily clients, but contacts)...are the only people in the world who can afford a 90 minute suborbital roller coaster ride for funsies. They're literally the entire market. And once they've had their ride to space and are satisfied--well, that is the entire market for the service.
 
Upvote
16 (34 / -18)

KrookedRooster

Ars Praetorian
486
Subscriptor
I don't understand why they shut down in the first place? Investing so much time and energy into a product (that yes, did kill people, unfortunately) then using it only a handful of times for a seemly rabid rich-people market because it ... wasn't profitable?

They had a working solution. Did it really "wear out" after only using it a few times? Could you not make up the "low cost" of a ticket in volume? Was this an FAA thing about flight regulations so they couldn't launch as much as they wanted? And rather than retrofitting the old one they are designing a new one from the ground up and THIS time it will work?

Or is this just Sunk-Cost-Fallacy meets Rich-British-Man-itis?
 
Upvote
-1 (7 / -8)

Lexomatic

Ars Praetorian
535
Subscriptor++
Whatever happened to the related aspirational market segment of stratospheric balloon tourism? Which provides much the same view of Earth's curvature, during a longer and more leisurely trip, at a lower price, but without the freefall segment. ...hmm... Summary article (CNBC, Jul 2024), but of those three, Space Perspective collapsed (Talk of Titusville, Feb 2025) and World View was acquired in 2026 and no longer speaks of passenger flights (Oct 2021, May 2022) -- although they still have a "space tourism support" email address.
  • Zephalto - Toulouse, France; Vincent Farret d'Astiès
  • Space Perspective - Space Coast, Florida, USA; Jane Poynter (see also: Ars, Feb 2024)
  • World View - Tucson, AZ, USA; Ryan Harman (see also: Ars, Jun 2019)
To experience freefall (albeit in short intervals), there's Zero Gravity Corporation, which at $8,900 for a public flight is much cheaper than both rocket-suborbital and not-yet-invented LTA stratospheric capsules. (Not to be confused with Zero Gravity Adventures, which is a scuba tour operator in the Maldives.)
 
Last edited:
Upvote
18 (18 / 0)
I don't understand why they shut down in the first place? Investing so much time and energy into a product (that yes, did kill people, unfortunately) then using it only a handful of times for a seemly rabid rich-people market because it ... wasn't profitable?

They had a working solution. Did it really "wear out" after only using it a few times? Could you not make up the "low cost" of a ticket in volume? Was this an FAA thing about flight regulations so they couldn't launch as much as they wanted? And rather than retrofitting the old one they are designing a new one from the ground up and THIS time it will work?

Or is this just Sunk-Cost-Fallacy meets Rich-British-Man-itis?
The original design, and frankly, more than likely, this new design as well, are overly complex, very possibly prone to fatigue, and require a lot of skill and oversight to both maintain and operate. There is an enormously vast distance between a product that almost cuts it, and one that is both profitable and sustainable
 
Upvote
19 (20 / -1)
I don't understand why they shut down in the first place? Investing so much time and energy into a product (that yes, did kill people, unfortunately) then using it only a handful of times for a seemly rabid rich-people market because it ... wasn't profitable?

They had a working solution. Did it really "wear out" after only using it a few times? Could you not make up the "low cost" of a ticket in volume? Was this an FAA thing about flight regulations so they couldn't launch as much as they wanted? And rather than retrofitting the old one they are designing a new one from the ground up and THIS time it will work?

Or is this just Sunk-Cost-Fallacy meets Rich-British-Man-itis?

If you are talking about Virgin they shutdown because the spaceplane had excessive wear. It was never going to work for the cadence they needed to break even. They couldn't even sustain their anemic cadence much less increase it by an order of magnitude.

For Blue it was more resources. A lot of the people on New Shepard are now working in the Blue lander program.

Both worked as a proof of concept but had turnaround and scalability issues. To make this work economically you really need weekly flights if not daily flights. Even at $1M a ticket with 4 to 8 people that is $4M to $8M gross revenue per flight. There is huge operational overhead meaning you need to fly hundreds if not thousands of customers per year. If you can't turn the vehicle around in a few days and get 100, 200, 300 launches a year you can't make the math work.

If suborbital tourism every works economically I think it will require much larger vehicle. Scale the NS capsule up to be two stories and twice the diameter holding 30 people. Have it land using retropropulsion with methalox thrusters. Parachutes as emergency backup only they are expensive to recover, inspect, and repack. If you can someday turn something like that around daily and have three vehicles then at $300k ea that is $1B gross annually. Now you are approaching the scale where you might be able to turn a profit.
 
Last edited:
Upvote
30 (31 / -1)

PhaseShifter

Ars Tribunus Angusticlavius
8,059
Subscriptor++
I really don't get the million dollar suborbital tourism thing.

If I just wanted to experience weightlessness, I could charter these guys for much less.

If I wanted to claim I'd been to space, then I would want to actually spend some real time in space. Suborbital flights are shorter than layovers at airports, and what credible person claims they've been to [insert state or country here] when all they did was move from one airplane to a second one without leaving the airport?
 
Upvote
6 (12 / -6)
I really don't get the million dollar suborbital tourism thing.

If I just wanted to experience weightlessness, I could charter these guys for much less.

If I wanted to claim I'd been to space, then I would want to actually spend some real time in space. Suborbital flights are shorter than layovers at airports, and what credible person claims they've been to [insert state or country here] when all they did was move from one airplane to a second one without leaving the airport?
you don't get it, because you don't have $1 million laying around waiting to be spent
 
Upvote
19 (20 / -1)
I really don't get the million dollar suborbital tourism thing.

If I just wanted to experience weightlessness, I could charter these guys for much less.

If I wanted to claim I'd been to space, then I would want to actually spend some real time in space. Suborbital flights are shorter than layovers at airports, and what credible person claims they've been to [insert state or country here] when all they did was move from one airplane to a second one without leaving the airport?

If I had the money I would do it. Not for bragging rights or to say I am an astronaut but just to do it. I don't consider myself rich but if prices ever got down to $100k I would seriously consider it. Not something I could do more than once but a once in a lifetime experience? Why not.

Saying I want to go orbital only is dubious. Sure that would be great, but given Dragon 2 is $288M a flight (NASA price) that is out of the price range for 99.9% of people who might be interested and could pay $1M. Sure if an orbital flight was $100k I would gladly do that instead but pretty sure that isn't happening in my lifetime and maybe not this century.
 
Last edited:
Upvote
20 (20 / 0)
Whatever happened to the related aspirational market segment of stratospheric balloon tourism? Which provides much the same view of Earth's curvature, during a longer and more leisurely trip, at a lower price, but without the freefall segment. ...hmm... Summary article (CNBC, Jul 2024), but of those three, Space Perspective collapsed (Talk of Titusville, Feb 2025) and World View was acquired in 2026 and no longer speaks of passenger flights (Oct 2021, May 2022) -- although they still have a "space tourism support" email address.
  • Zephalto - Toulouse, France; Vincent Farret d'Astiès
  • Space Perspective - Space Coast, Florida, USA; Jane Poynter (see also: Ars, Feb 2024)
  • World View - Tucson, AZ, USA; Ryan Harman (see also: Ars, Jun 2019)
To experience freefall (albeit in short intervals), there's Zero Gravity Corporation, which at $8,900 for a public flight is much cheaper than both rocket-suborbital and not-yet-invented LTA stratospheric capsules. (Not to be confused with Zero Gravity Adventures, which is a scuba tour operator in the Maldives.)

You can also get zero g conditions on a Pirate Ship ride at an amusement park - or a glider at ~3000ft. Both are a lot cheaper. But it is difficult to make the false claim "look we're in space because it is zero g"!
 
Upvote
-7 (1 / -8)
I don't understand why they shut down in the first place? Investing so much time and energy into a product (that yes, did kill people, unfortunately) then using it only a handful of times for a seemly rabid rich-people market because it ... wasn't profitable?

They had a working solution. Did it really "wear out" after only using it a few times? Could you not make up the "low cost" of a ticket in volume? Was this an FAA thing about flight regulations so they couldn't launch as much as they wanted? And rather than retrofitting the old one they are designing a new one from the ground up and THIS time it will work?

Or is this just Sunk-Cost-Fallacy meets Rich-British-Man-itis?
The original craft (and mothership) were built pretty much as experimental aircraft. They had serious issues with wear and tear - the pylon holding the spaceplane to the mother ship would start cracking up after a few flights.

So all of that need to be re-engineered into a long term solution.

They also had enormous trouble with propulsion. It turned out that hybrid rockets (which were picked by a non-rocket expert) are neither simple nor easily scalable. The bodged a solution that worked but cost a lot in performance and weight for the fixes. So that needed to be redone.

So they needed a new mothership, a new space place and a new rocket motor. Essentially everything.

The spaceplane is extremely manual to fly. Not sure if they are changing this, though.

So they need another development program, in effect. Their costs are very high and they've burnt through a big pile of cash.
 
Upvote
25 (25 / 0)
Can someone buy the New Shepard capsule designs from BO and continue that business ?
If there are customers, and no design costs to amortize, maybe $2M or $3M will break even ?

If the custom reusable rocket itself is too expensive to service, offer people a thrill ride with reliable non-NG solids ?
There's nothing fundamentally wrong with the NG design, and it's double-proven to be safe, so I'm curious whether there's still a sustainable path there for science experiments that don't fit a sounding rocket, mixed with tourists.
 
Upvote
-2 (1 / -3)
Can someone buy the New Shepard capsule designs from BO and continue that business ?
If there are customers, and no design costs to amortize, maybe $2M or $3M will break even ?

If the custom reusable rocket itself is too expensive to service, offer people a thrill ride with reliable non-NG solids ?
There's nothing fundamentally wrong with the NG design, and it's double-proven to be safe, so I'm curious whether there's still a sustainable path there for science experiments that don't fit a sounding rocket, mixed with tourists.

I doubt Blue has any interest in selling. To be clear though while NS is likely dead officially it is just paused for 2 years to bolster Artemis program projects. It is possible it comes back eventually either in current form or an improved model with the lessons learned from NS1.

If the custom reusable rocket itself is too expensive to service, offer people a thrill ride with reliable non-NG solids ?

No. Just no.
 
Last edited:
Upvote
13 (13 / 0)
They need to pivot to point to point transportation if they can.
They can't. The technology - the feathering mechanism and the lack of a heat shield - really doesn't go with the point to point trajectories.

In addition, you'd want ground launch for point to point, probably.
 
Upvote
11 (11 / 0)

marsilies

Ars Legatus Legionis
24,478
Subscriptor++
They need to pivot to point to point transportation if they can.
They've stated that's one of their goals.
https://meincmagazine.com/science/201...al-may-be-point-to-point-travel-around-earth/
However, the firm’s new chairman, venture capitalist Chamath Palihapitiya, recently suggested that the company’s long-term profitability may come more through travel than space tourism. At the Phocuswright travel industry conference last week, Palihapitiya spoke about his interest in point-to-point travel on Earth....

“You would never think that you could go to Hong Kong for the weekend, or if you were in San Francisco, you could go to London for the weekend,” Palihapitiya said. “But if you could get there in 90 minutes, it’s no different than driving from one tip of San Francisco to the other in traffic. So that’s completely transformational to the world of travel and tourism and transportation.”

He also suggested that the idea of point-to-point suborbital travel is not in some distant, hazy future but within the near-term plans of the company. “When you think about that world, that world will be five to 10 years away,” he said.

More info:
https://www.space.com/38758-virgin-galactic-point-to-point-travel.html
https://techcrunch.com/2020/05/05/v...develop-supersonic-point-to-point-air-travel/
 
Upvote
6 (7 / -1)
I never understood sub-orbital flight. If I want to go to space, I would want to go to space, which in my mind is orbit. Maybe 3 to 10 orbits of Earth?

Similar to when I went skydiving. I didn't want a low level static line jump. I wanted to experience free fall from above 12,000 feet. It was a tandem jump but it didn't matter to me.

A fully reusable rocket I believe will eventually make the idea of a short stay orbital flight much more reasonable. I believe a 3rd stage, shuttle style glider type system to land the human crew would make much more sense over a capsule splash down. De-orbit the 2nd stage and have the glider detach and land like a plane. Charge $5 million each and have 10 passengers. $50 million per flight and have a cost around $25 million per flight. Fly every week ~50 flights a year. That is $1.25 billion in profits a year.

The more the hardware can get re-used the more proitable it becomes. There are almost 30,000 people worth $100 million in the world. Finding 500 to spend $5 million a year shouldn't be difficult.
 
Upvote
-3 (5 / -8)
They've stated that, but, among other things, point-to-point would require vastly more velocity than their system can achieve and faster reentry.

To fix that would require a heat shield, new propulsion systems and (probably) ditching feathering reentry.

Which would mean a whole new system that doesn't look like this one.
 
Upvote
8 (8 / 0)

Fatesrider

Ars Legatus Legionis
25,196
Subscriptor
The new ship revealed this week will presumably make that first flight. According to Virgin Galactic, it was being moved this week from the assembly hangar to the launch hangar and will now “undergo final systems integration and ground testing.”

It’s difficult to tell from an image, but the vehicle appears to have a significant amount of integration left to undergo, and its test campaign will not be short.
I love how "systems integration" is being used to say, "we still have to put in a fucking FLOOR, let alone seats, insulation, avionic, rocket motor, guidance ssytem, flight control system, pressurization checks, air supplies...

The fucking thing is just a shell. Nothing inside. It's not hard to tell. You can see through the gaping holes in it (windows eventually? Who knows?). There' s literally nothing in there.

This is a publicly traded company. It is LIKELY on the verge of bankruptcy. They need investment cash to keep going, and that is drying up like the Amazon basin (among other places). So parading a mockup that is touted to be more than it's possibly able to become without a fresh infusion of cash seems a fuckton more likely for this publicity stunt than anything like "Ho hum, this is just us on a typical day producing another space vehicle, so invest! We're going places!"

Yeah, straight to Chapter 7.
 
Upvote
17 (18 / -1)

marsilies

Ars Legatus Legionis
24,478
Subscriptor++
They've stated that, but, among other things, point-to-point would require vastly more velocity than their system can achieve and faster reentry.
Why would it require those things?

This is one analysis I found of the point-to-point plans:
https://www.illdefined.space/focus-on-virgin-galactics-wild-ride/
For example, there are at least two challenges with adopting Virgin Galactic’s current approach using WhiteKnightTwo for suborbital point-to-point human spaceflight. First, the design would need to be significantly revised. It is designed for SpaceShipTwo only (with a ~3000-4000 kg margin). Longer trips beyond the atmosphere require a bigger rocketplane than SpaceShipTwo, implying more mass, longer body, etc., possibly exceeding WhiteKnightTwo’s capabilities.

The second challenge (alluded to earlier) is the time required for WhiteKnightTwo to get to launch altitude. If future Virgin Galactic point-to-point services use a similar system, it won’t be as quick as advertised. So that hypersonic flight from LA to Hong Kong in about 90 minutes becomes nearly a third longer in duration. However, three hours would still be much faster than what airlines offer between those two points today.
 
Upvote
-3 (0 / -3)
Why would it require those things?

This is one analysis I found of the point-to-point plans:
https://www.illdefined.space/focus-on-virgin-galactics-wild-ride/

Your analysis said the same thing. It would require extensive modification to both the spacecraft and

point to point requires substantially more deltav which would require vastly more propellant mass which would mean a much larger vehicle, which would change just about everything, which would probably require a new carrier aircraft to lift it.

It is the same reason an ICBM is bigger than a short range ballistic missile.

To reach space (100km) straight up requires about 1.4 km/s of dV. Spacecraft two obviously has less as they can't reach 100km/s so lets guesstimate 1000 m/s. Suborbital from New York to London would require >5 km/s. LA to Hong Kong closer to 9 km/s.
 
Last edited:
Upvote
10 (10 / 0)

marsilies

Ars Legatus Legionis
24,478
Subscriptor++
Your analysis said the same thing. It would require extensive modification to both the spacecraft and point to point requires substantially more deltav which would require vastly more propellant mass which would mean a much larger vehicle, which would change just about everything, which would probably require a new carrier aircraft to lift it.
It's not the same thing though. The article I linked to talked about the complications around additional mass for travelling longer distances, while @Malmesbury claimed that it'd need "vastly more velocity," and the complications that would entail.

It seems like for point-to-point, their craft wouldn't have to necessarily go faster or higher, just travel longer at the altitude it currently reaches. That wouldn't need a heat shield like Malmesbury claimed.
 
Upvote
-3 (1 / -4)
It's not the same thing though. The article I linked to talked about the complications around additional mass for travelling longer distances, while @Malmesbury claimed that it'd need "vastly more velocity," and the complications that would entail.

It seems like for point-to-point, their craft wouldn't have to necessarily go faster or higher, just travel longer at the altitude it currently reaches. That wouldn't need a heat shield like Malmesbury claimed.

That is the reason for the mass. The further you want to go the more deltaV it requires. It also means the hotter you would come back in on the other end.

To reach space straight up and down requires 1.4 km/s. We know this spacecraft has less than that because it can't even reach 100 km up. Flying New York to London would require > 5 km/s of dV.
 
Last edited:
Upvote
3 (3 / 0)

marsilies

Ars Legatus Legionis
24,478
Subscriptor++
That is the reason for the mass. The further you want to go the more deltaV it requires. It also means the hotter you would come back in on the other end.

To reach space straight up and down requires 1.4 km/s. We know this spacecraft has less than that because it can't even reach 100 km up. Flying New York to London would require about 4.5 km/s of dV.

Are you saying it's a requirement of this type of ship to go higher and faster in order to go further around the globe? There's no option of a "cruising height" it could stick at to transverse the globe more without going higher?
 
Upvote
-2 (0 / -2)
Are you saying it's a requirement of this type of ship to go higher and faster in order to go further around the globe? There's no option of a "cruising height" it could stick at to transverse the globe more without going higher?

Yes. That is how suborbital trajectories work. To go further requires more deltaV. Even out of the atmosphere gravity is still slowing your vertical velocity so your altitude will rise peak (apogee) and then decline. That determines how long you can fly. The horizontal component determines how far. To go further requires flying long which means you need to go faster in order to go higher.

Eventually it would require so much deltaV that you can go orbital. It is why both US and Soviet earliest orbital launch vehicles were slight modification of ultra long range ballistic missiles (i.e. Juno-I and R-7). We started from v-2 (yeah the nazi one) which had about 2 km/s of dV enough to travel horizontally about 300 km and kept getting bigger and bigger meaning more dV which meant nukes could be thrown further and further until just a bit more velocity meant you could go into orbit.
 
Last edited:
Upvote
11 (11 / 0)

marsilies

Ars Legatus Legionis
24,478
Subscriptor++
Yes. That is how suborbital trajectories work. To go further requires more deltaV. Eventually it would require so much deltaV that you can go orbital. It is why our earliest orbital launch vehicles were slight modification of ultra long range ballistic missiles (i.e. Mercury Atlas).
Are you thinking just about rockets though? Does a suborbital plane have to work that way?

I found this paper:
https://www.sciencedirect.com/science/article/abs/pii/S0094576509004767
For the special case of a flight from a spaceport to another one in close proximity, (say within a few hundred kilometers), it may be possible to “stretch” the design of a currently planned sub-orbital space tourism vehicle to carry out the mission. The main requirement would be to carry more propellant, or install an auxiliary apogee boost motor, to translate the vehicle horizontally while above the atmosphere. Some simplistic, but nevertheless enlightening, calculations on this approach...

I'm talking about something that "translates the vehicle horizontally" a further distance at the current height it reaches.

Again, I realize that this would take more propulsion, and thus more fuel, etc. , but not necessarily faster velocities.

I found an article that I believe is discussing what I'm talking about, and talks about the pitfalls:
Then there are the technical challenges. First and foremost, the velocity required for intercontinental ranges, and hence the “delta-V” that the vehicle would need to achieve, would be uncomfortably close to orbital velocities. For example, a flight of about 10,000 kilometers would require a delta-V of over 7,300 meters/second, which is already about 80% of that required to reach low Earth orbit. Thus, the mass ratio required would begin to approach that necessary for a single-stage-to-orbit vehicle. Likewise, the amount of propellant required would be significant. And while suitable propellants for such a vehicle (probably LOX/hydrogen or methane) are reasonably inexpensive, it would add up for a vehicle that must attain near-orbital velocities. Another consequence of these high velocities would be the need for a very robust thermal protection system (TPS), again very close to what would be required for an orbital vehicle. During my involvement with a hypersonic vehicle program in the late 1980s, the rule of thumb was that once you got over about 5,000 meters/second, the difference between that and an orbital reentry environment were small.

The bottom line is that a useful suborbital transport would require many of the same design features of an orbital vehicle. The TPS; the high-performance rocket engines; the amount of propellant that would need to be carried; the guidance, navigation, and control systems; as well as the launch support infrastructure would have it looking a whole lot like an orbital RLV.

Again, it's arguing staying at suborbital height for a longer time. Yes the delta-V increases (to 80% of orbital), but that's due to having to maintain height and velocity, not going higher or faster. Still, it introduces an interesting complication of heat buildup staying at the sub-orbital altitudes for longer making it similar to orbital re-entry.

Also, this image:
1777666952174.png


From this article:
https://www.researchgate.net/public...Space_Tourism_to_Commercial_Suborbital_Travel

That looks different than the more uniform loops of almost straight up-then-straight down of sub-orbital rockets, or even of the path Virgin Galactic uses now:

1777667326981.png

https://maxpolyakov.com/the-future-of-commercial-space-travel-part-1-suborbital-and-rocket-tours/

An interesting wrinkle is the concept that the longer sub-orbital plane flights wouldn't have such a steep AOA for either accent or descent. The point wouldn't be to get to "space" as fast as possible, or provide a period of "zero g," but to go farther at comfortable levels of acceleration for passengers.

So I can see where the argument is that "the delta-V is about the same" as for a rocket or other spaceplane going higher and faster to travel the same distance, but it looks like you don't have to go higher and faster to go a further distance.
 
Upvote
-3 (0 / -3)
Are you thinking just about rockets though? Does a suborbital plane have to work that way?

I found this paper:
https://www.sciencedirect.com/science/article/abs/pii/S0094576509004767


I'm talking about something that "translates the vehicle horizontally" a further distance at the current height it reaches.

Again, I realize that this would take more propulsion, and thus more fuel, etc. , but not necessarily faster velocities.

Yes the more propellant is for more velocity. That is how suborbital trajectories work. More propellant allows you to go faster which means it will take longer for you to fall back to the surface and during that time you can go further.

I found an article that I believe is discussing what I'm talking about, and talks about the pitfalls:


Again, it's arguing staying at suborbital height for a longer time. Yes the delta-V increases (to 80% of orbital), but that's due to having to maintain height and velocity, not going higher or faster.

No it does not say that. You maintain suborbital flight longer ... by GOING FASTER.

Still, it introduces an interesting complication of heat buildup staying at the sub-orbital altitudes for longer making it similar to orbital re-entry.

There is no such thing as suborbital ALTITUDE. You can go 5,000 km up and still be suborbital. In fact to test ballistic missiles without flying over other people's countries (and they tend to dislike that) this is often done. You fly a near vertical trajectory see how high you go and then can compute how far you could have gone with a 45 degree launch angle.

Suborbital vs orbital is about velocity not altitude. Going to orbit means going fast not going high. Most people visualize the high part but really is 100 km that far away. Getting to orbit is hard because of the 9km to 10 km/s it takes to get the required level of fast to stay up there (7.3 km/s plus losses).

At one extreme of suborbital spaceflight you need a mere 1.4 km/s of dV. That allows you to go straight up 100 km and straight back down using a near vertical launch angle. The reason you don't need a heat shield isn't because it is suborbital it is because it is relatively slow. At the other extreme is being just shy of orbital velocity (peak velocity of 7.2 km/s after fighting drag and gravity losses) which would allow you to go 5 to 10km on an optimized trajectory. However despite being suborbital being just shy of orbital velocities (7.3 km/s) means the thermal impact is very similar to orbital re-entry.

That looks different than the more uniform loops of almost straight up-then-straight down of sub-orbital rockets, or even of the path Virgin Galactic uses now:

Correct and that requires a high higher velocity. There is no magic go further with less velocity using suborbital/ballistic flight. Velocity and horizontal distance are linked. The other aspect is the launch angle or theta (what you call angle of attack) but 45 degrees is ideal for maximizing range beyond that to go further requires going faster.

burnout velocity vs horizontal distance at 45 degree launch angle
1 km/s 115 km
2 km/s 423 km
3 km/s 932 km
4 km/s 1,650 km
5 km/s 2,560 km
7 km/s 5,434 km

Note these numbers don't account for gravity decreasing the further you get from the Earth (too lazy for that). On the low end the impact is minimal but on the high end it is very significant so feel free to increase the high end numbers by 50%. I think it is clear though that to go further you have to go faster and to go a lot further you have to go a lot faster.

So I can see where the argument is that "the delta-V is about the same" as for a rocket or other spaceplane going higher and faster to travel the same distance, but it looks like you don't have to go higher and faster to go a further distance.

Yes you do (to a first order simplification). Yes there are other factors like drag and gravity losses, the reduced impact of gravity at extreme apogees, and lifting bodies but in general you must go faster to go further.

From your own reference

The bottom line is that a useful suborbital transport would require many of the same design features of an orbital vehicle. The TPS; the high-performance rocket engines; the amount of propellant that would need to be carried; the guidance, navigation, and control systems; as well as the launch support infrastructure would have it looking a whole lot like an orbital RLV.

...

For example, a flight of about 10,000 kilometers would require a delta-V of over 7,300 meters/second, which is already about 80% of that required to reach low Earth orbit.

...

During my involvement with a hypersonic vehicle program in the late 1980s, the rule of thumb was that once you got over about 5,000 meters/second, the difference between that and an orbital reentry environment were small.
 
Last edited:
Upvote
6 (7 / -1)