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Search: Posts made by: David Spain
Forum: Policy January 16th 20, 05:59 PM Posted to sci.space.policy
Replies: 3
Views: 64
Posted By David Spain
Lack of Diversity

I'm thinking you should rename this newsgroup from sci.space.policy to
sci.space.jfmeziqanda

If it weren't for Mr. Mezi's questions there wouldn't be any traffic in
this group at all. I think he...
Forum: Policy January 11th 20, 09:43 PM Posted to sci.space.policy
Replies: 25
Views: 293
Posted By David Spain
What to expect

Nah, you guys are all missing it....

Orbicab.... The next UberLyft, but we aren't calling it that.... :-P

Dave

On 2020-01-08 1:05 PM, Greg (Strider) Moore wrote:
"Jeff Findley"* wrote in...
Forum: Policy January 3rd 20, 03:58 PM Posted to sci.space.policy
Replies: 25
Views: 293
Posted By David Spain
What to expect

On 2020-01-03 3:30 AM, JF Mezei wrote:
On 2020-01-02 11:30, Alain Fournier wrote:

We've been using
capsules since the 1960's.

The Boeing one can land on land, so this is different.
...
Forum: Policy December 31st 19, 09:13 AM Posted to sci.space.policy
Replies: 25
Views: 293
Posted By David Spain
What to expect

On 2019-12-30 8:19 PM, Jeff Findley wrote:
In article , says...

Happy New Year to all.

What do you expect will be the most interesting...
Forum: Policy December 27th 19, 06:34 PM Posted to sci.space.policy
Replies: 4
Views: 98
Posted By David Spain
Starliner orbit

On 2019-12-27 12:01 PM, Greg (Strider) Moore wrote:

Not like NASA has EVER done that.* Oh wait...

Jeff


Maybe it would have been best if Bridenstein hadn't been there at all.
Sometimes...
Forum: Policy December 27th 19, 06:18 PM Posted to sci.space.policy
Replies: 2
Views: 137
Posted By David Spain
Space Force?

On 2019-12-13 8:41 PM, wrote:
https://www.rt.com/usa/475636-trump-space-force-ndaa/

How to philosophically engage in space war?

My suggestion is to openly do the...
Forum: Policy December 27th 19, 06:03 PM Posted to sci.space.policy
Replies: 2
Views: 179
Posted By David Spain
4 Products That Make Sense to Manufacture in Orbit

On 2019-12-13 5:05 PM, jacob navia wrote:
Le 28/11/2019 * 05:26, a écrit*:
What other products justify the high cost of orbital manufacturing?

None

It is funny...
Forum: Policy December 27th 19, 05:51 PM Posted to sci.space.policy
Replies: 5
Views: 328
Posted By David Spain
Steel for Shuttle

On 2019-11-18 7:24 AM, Jeff Findley wrote:
In article ,
says...

On 2019-11-17 10:00, Jeff Findley wrote:

Sure. All of...
Forum: Policy December 27th 19, 05:28 PM Posted to sci.space.policy
Replies: 1
Views: 139
Posted By David Spain
Action reaction principle can be violated

Yeah sure...

Tell you what, place a big mother electromagnet in a satellite whose
polarity switches depending upon the hemisphere it is above in Earth
orbit and tell me how its performance...
Forum: Policy December 27th 19, 05:18 PM Posted to sci.space.policy
Replies: 5
Views: 328
Posted By David Spain
Steel for Shuttle

On 2019-11-18 4:36 PM, JF Mezei wrote:
On 2019-11-18 07:24, Jeff Findley wrote:
You didn't even click on the links I provided to high temperature
aerospace wiring, did you?
I don't doubt...
Forum: Policy October 21st 19, 01:14 PM Posted to sci.space.policy
Replies: 14
Views: 680
Posted By David Spain
A conversation with Elon Musk

On 2019-10-21 7:46 AM, Jeff Findley wrote:

Also, the goal is to lower the cost of access to space. Cheap stainless
steel allows for that far more than something "exotic" and more
expensive...
Forum: Policy October 15th 19, 12:26 AM Posted to sci.space.policy
Replies: 14
Views: 680
Posted By David Spain
A conversation with Elon Musk

On 2019-10-14 3:08 PM, JF Mezei wrote:
On 2019-10-14 12:30, David Spain wrote:

That is really a remarkable comment. Not as bad? How do you know? You
building Starships?

I was noting...
Forum: Policy October 14th 19, 05:30 PM Posted to sci.space.policy
Replies: 14
Views: 680
Posted By David Spain
A conversation with Elon Musk

On 2019-10-14 3:45 AM, JF Mezei wrote:
On 2019-10-11 07:25, Jeff Findley wrote:

But, as Musk also said, raw materials for carbon composite structures
cost a *lot* more than commonly...
Forum: Policy October 14th 19, 05:06 PM Posted to sci.space.policy
Replies: 14
Views: 680
Posted By David Spain
A conversation with Elon Musk

On 2019-10-14 2:52 AM, JF Mezei wrote:
On 2019-10-10 06:42, Jeff Findley wrote:

This I agree with. But, I seriously doubt extensible nozzles will be
one of them.

Wouldn't 3 engines...
Forum: Policy October 9th 19, 04:09 PM Posted to sci.space.policy
Replies: 14
Views: 680
Posted By David Spain
A conversation with Elon Musk

On 2019-10-09 7:50 AM, Jeff Findley wrote:
In article ,
says...

On Thursday, October 3, 2019 at 6:49:33 AM...
Forum: Policy October 4th 19, 04:44 PM Posted to sci.space.policy
Replies: 32
Views: 1,716
Posted By David Spain
Two Starships in "bolas" rotation

On 2019-10-04 8:45 AM, Jeff Findley wrote:
In article , says...
I think 20-30 meters diameter is still small for centrifugal artificial
...
Forum: Policy October 3rd 19, 05:18 PM Posted to sci.space.policy
Replies: 32
Views: 1,716
Posted By David Spain
Two Starships in "bolas" rotation

On 2019-07-26 2:44 PM, Niklas Holsti wrote:
On 19-07-26 20:54 , David Spain wrote:

Or even
more simply, just put the spacecraft into a spin along the flight path
vector. Thus no 2nd ship...
Forum: Policy October 3rd 19, 03:59 PM Posted to sci.space.policy
Replies: 32
Views: 1,716
Posted By David Spain
Two Starships in "bolas" rotation

On 2019-05-21 2:15 PM, Niklas Holsti wrote:

So that's the suggestion. Comments are welcome...


The other popular scheme is attaching two Starships end-to-end rather
than nose-to-nose. Speed...
Forum: Policy October 3rd 19, 03:23 PM Posted to sci.space.policy
Replies: 32
Views: 1,716
Posted By David Spain
Two Starships in "bolas" rotation

I have an update for you Niklas.

Here's a fellow (smallstars) who has proposed an artificial gravity
system based on the same physical principles you rely on but uses a
third Starship as a cargo...
Forum: Policy October 1st 19, 05:03 PM Posted to sci.space.policy
Replies: 3
Views: 578
Posted By David Spain
NASA wants to send nuclear rockets to the Moon and Mars

On 2019-09-30 11:00 PM, wrote:
Note that Elon Musk wants to do similar missions with space-to-space refueling.
Which approach is better?



SpaceX's plan for...
Forum: Policy September 20th 19, 07:30 PM Posted to sci.space.policy
Replies: 0
Views: 522
Posted By David Spain
HabEx would facilitate direct observation of exoplanets.

As part of NASA’s continued effort to ensure a steady supply of
astrophysics and astronomy missions, the agency is undertaking the
Astro2020: Decadal Survey on Astronomy and Astrophysics. ...
Forum: Policy September 20th 19, 01:15 PM Posted to sci.space.policy
Replies: 8
Views: 601
Posted By David Spain
Meet The Nuclear-Powered Self-Driving Drone NASA Is Sending To AMoon Of Saturn

On 2019-09-17 1:33 PM, wrote:
"On the face of it, NASA's newest probe sounds incredible. Known as Dragonfly, it [...]

See:

...
Forum: Policy September 20th 19, 01:10 PM Posted to sci.space.policy
Replies: 8
Views: 601
Posted By David Spain
Meet The Nuclear-Powered Self-Driving Drone NASA Is Sending To AMoon Of Saturn

On 2019-09-18 11:40 PM, Scott Kozel wrote:
On Wednesday, September 18, 2019 at 11:24:55 AM UTC-4, David Spain wrote:
"Daytime" surface illumination is 1000x less than Earth or 1000x full
...
Forum: Policy September 18th 19, 04:24 PM Posted to sci.space.policy
Replies: 8
Views: 601
Posted By David Spain
Meet The Nuclear-Powered Self-Driving Drone NASA Is Sending To AMoon Of Saturn

On 2019-09-18 9:19 AM, Scott Kozel wrote:
I saw an article that said that the atmospheric density at the surface is
2 times that of Earth, the gravity is 1/3 that of Earth, and that a
human...
Forum: Policy September 18th 19, 03:50 PM Posted to sci.space.policy
Replies: 8
Views: 601
Posted By David Spain
Meet The Nuclear-Powered Self-Driving Drone NASA Is Sending To AMoon Of Saturn

References to papers and links got scrambled.

The second link is the older paper 1999.
The third link is the most recent paper 2018.

I thought I had fixed those!

Dave
Showing results 1 to 25 of 500

 
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