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kbd512

Administrator

Registered: 2015-01-02

Posts: 7,852

Re: RobertDyck Postings

tahanson43206,

There's not much in aviation that's truly been standardized, because interoperability is not typically vitally important.  There's no global or near-global standard for jet fuel.  One would think that would be critically important for airliners that routinely fly between continents and refuel using different grades of kerosene with different additives packages.  Here in North / South America we mostly use Jet-A.  In Europe, they typically use the more highly refined Jet-A1.  The additives can be very different across North America.  Canada uses a very healthy amount of additive to inhibit freezing.  In Texas or Mexico?  Not quite as much.  Any jet operates in frigid temperatures, but ground handling and fuel temperature dictate that the fuel cannot have the consistency of maple syrup.  As long as the base fuel stock is nominally a kerosene derivative with additives that won't allow the fuel to congeal at low temperatures, jet engines the world over don't seem to have much of an issue with converting whatever grade of kerosene is available into noise.

As far as the space suit interoperability issues are concerned, if NASA is ultimately paying for these development efforts, and in every case of a suit flown in space they most certainly are, one would hope that they have the forethought to enforce interoperability standards in the suit design specifications before money is handed out.  Not being able to plug your O2 hose into a Starliner or Dragon capsule after a disaster forces a change of plans seems like a really dumb way to die.

I don't know all of RobertDyck's opinions on this, but I think he and I generally agree that mechanical counter-pressure suits remain the lightest and most versatile of the available options.  While they are the most highly tailored-to-fit suits, and can be somewhat uncomfortable in a high pressure atmosphere, they also provide the greatest range of motion and manual dexterity for minimal effort / calorie burn on the part of the wearer.  Manual dexterity is the difference between someone being able to complete fine motor manipulation tasks quickly and easily, or clumsily fumbling about for extended periods of time.  From talking to the man who repaired the Hubble Space Telescope, that task could've gone a bit faster if merely grasping the tools wasn't a chore.  Emergency escape / depressurization protection aside, the entire reason for having EVA suits is to accomplish fine manipulation tasks using human hands, in the vacuum of space.  This suit design serves both purposes, with additional temperature protection added as required.  None of the current space suits are really suitable for that sort of manipulation.  They're all beautified "gas bags".

tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re new post in Thermal Management topic

Thanks for this very nice addition to the topic!

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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck...
https://newmars.com/forums/viewtopic.ph … 02#p226702
News from SpaceNut..
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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re recent fusion initiative....

One of the benefits of a forum like this one is the support that can be provided for innovative thinking.

Not every member of a forum like this one is inclined to provide support, but a few are, from time to time.

In the case of your recent initiative, I think the opportunity is there for some learning experiences, because fusion is itself such a deep field, in which multiple generations of the world's brightest people have made incremental gains but are still far from a working solution.

You started out with an observation about the behavior of matter interacting in sound waves.  From this, it appears to me you might have extrapolated to the field of atomic fusion.  I offered you the opportunity to begin the learning process by finding the velocity that a deuterium atom must have in order for it to overcome the atomic force of the nucleus of another such atom.  If you are able to find that velocity, it would make a great (valuable) addition to the topic you created.

I think of this forum as a place where readers who are not members can find thoughtful discussion of often difficult subjects.

There's a lot of lighter content in the forum, without a doubt, but topics with serious titles have at least the potential to become resources for learning.

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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re conversation with Calliban about the future...

https://newmars.com/forums/viewtopic.ph … 17#p227217

Thanks for that thoughtful reminder of the positive influence of the Star Trek franchise.

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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re Thanksgiving in Canada!

Thanks for the reports of you and your girl friend preparing for the Day!

Best wishes for success with dinner preparations!

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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re opportunities for follow up ...

Off the top...
How'd the turkey turn out?
What is new about the scanners you installed?
And how did the installation go?
The fusion topic had a promising opening and then went into stealth mode.
What I'm hoping someone will add to the topic is the velocity a deuterium atom must have to penetrate the defenses of another deuterium atom.
Large Ship ... GW Johnson has posted a design for a counter-rotating Aldrin Cycler... He decided NOT to adopt your recommendation for the Mars equivalent environment.  His argument is basically that 1 G and 1 STM are what his customers expect so he'll provide it.

I think your argument, in favor of a Mars Environment from the outset for ** all ** deep space missions is strong on multiple points:
1) No pre-breath for space suit excursions
2) Less stress on the interior of the vessel due to 1/2 the pressure
3) Less stress on the structure due to Mars equivalent gravity
4) Less loss due to leaks because of 1/2 pressure.

There may be other points I've missed.

However, this ** is ** an opportunity for you to study GW's design to see if there is anything you want to consider for Large Ship.

I think you'll find that chances of funding will improve if you adopt a counter rotating design. Potential captains will appreciate the stability that design offers.

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tahanson43206

Moderator

Registered: 2018-04-27

Posts: 19,365

Re: RobertDyck Postings

For RobertDyck re testing of new FluBB web site...

Please log into the new system at http://newmars.com/new/

Please post a message there to confirm you were able to log in, and to report your observations.

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