SpaceX News

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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Maui
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Re: SpaceX News

Postby Maui » Sat Jul 01, 2017 10:28 pm

Hey, hey, hey! Exciting!

Where do you work now, if you don't mind me asking...

paperburn1
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Re: SpaceX News

Postby paperburn1 » Sun Jul 02, 2017 12:20 am

MCAS cherry point.
Flight simulation/crew training
Filled out the form on a whim.
I doubt this will lead anywhere but crews do need to be trained, simulators need to be maintained
I am not a nuclear physicist, but play one on the internet.

NotAPhysicist
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Re: SpaceX News

Postby NotAPhysicist » Sun Jul 02, 2017 8:06 am

Nice one, good luck! :)

NotAPhysicist
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Re: SpaceX News

Postby NotAPhysicist » Sun Jul 02, 2017 9:10 pm

They reckon good weather is only 40% for the launch today.
Also, the range is apparently down for maintainence/upgrade, which explains some of the slow down in launch candence. That is probably a good thing!..
Link:

Tom Ligon
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Re: SpaceX News

Postby Tom Ligon » Mon Jul 31, 2017 3:54 am

Is the Falcon Heavy finally going to fly this year?

Its all just talk until it is on the pad, but we'll be watching. Ought to be a good show.

http://www.spaceflightinsider.com/organ ... arly-fall/

ladajo
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Re: SpaceX News

Postby ladajo » Mon Jul 31, 2017 12:50 pm

Tom,
They have been rolling it right all since last year. While I would love to see it fly tomorrow, I am willing to wait for them to get it right.
Should be a spectacular launch, and I have considered a couple of times to make the run down. The 'All-D' experience looks promising...

On another note, I had long chat with Jaeyoung this weekend. He is doing well, and the sims are progressing well.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

paperburn1
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Re: SpaceX News

Postby paperburn1 » Mon Jul 31, 2017 3:38 pm

Major problem is having the pad ready on time and also they can not start all 27 engines at once for fear of sonic rapid disassembly. But they are working on a plan to sequence start the engines all within a second or two.
I am not a nuclear physicist, but play one on the internet.

krenshala
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Re: SpaceX News

Postby krenshala » Thu Aug 03, 2017 12:29 pm

Is that sonic issue even with the (water) sound suppression system going?

ladajo
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Re: SpaceX News

Postby ladajo » Thu Aug 03, 2017 1:03 pm

I can imagine that simultaneous start on all 27 would make quite the pop!

Have to find an old video from the Saturn Vs to see if the was a slight stagger in lights on the five engines.

I know during my time at Stennis, that there was a good pop from a single STS ME light off. Of course the ground rumble felt for miles and miles was pretty cool too. Even out in the swamp.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

paperburn1
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Re: SpaceX News

Postby paperburn1 » Fri Aug 04, 2017 5:04 am

I am not a nuclear physicist, but play one on the internet.

ladajo
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Re: SpaceX News

Postby ladajo » Fri Aug 04, 2017 12:37 pm

Thanks for the link, I will check it out. Sounds cool.
Looks like the Falcon Heavy will need to follow a similar approach. Shouldn't be too hard to manage. Especially given the comparatively exquisite throttle control and range they enjoy over the original school guys.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

Tom Ligon
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Re: SpaceX News

Postby Tom Ligon » Sat Aug 05, 2017 8:59 pm

That answers my question ... why not start them out at a low throttle setting and then run them up. Apparently they do.

So, a little reverse engineering of the numbers. The Saturn V first stage burn was 165 seconds and it carried 203,400 gallons kero and 318,000 gallons of LOX, or a burn of 1233 gallons/sec of kero and 1927 gal/second of LOX. Divide by five to get the burn of the individual engines.

245 gps kero, 385 gps LOX.

So if one started at 1% throttle, what kind of explosive power do you get from 2.45 gallons of kerosene and 3.85 gallons of liquid oxygen.

Ah, I think I see the problem. Even a soft start on those engines would be a blast that would level the average home, sending bits flying for a mile.

ladajo
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Re: SpaceX News

Postby ladajo » Sun Aug 06, 2017 3:41 am

2.45 gals kerosene at about 6.82 lbs /gal at 10% tnt equivalent gives 1.67lbs tnt.
3.85 gals LOX at 9.52lbs/gal at 60% tnt equivalent gives 22lbs tnt.
Grand total: 23.67lbs tnt.

That will level a house for sure.
It is akin to a Hellfire hit, which has an equivalent warhead of about 23lbs tnt (20lbs slightly higher energy explosive)


Just for fun, here is a link to an explosive energy calculator. 23lbs of tnt is about 0.0115 tons of tnt.



Edit: Added Convertor Link and comment/link on battlefield equivalent.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

Tom Ligon
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Joined: Wed Aug 22, 2007 1:23 am
Location: Northern Virginia
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Re: SpaceX News

Postby Tom Ligon » Sun Aug 06, 2017 2:21 pm

Boom Converter. Gotta love it! That went straight into my favorites list, right under Engineering Toolbox and the Little Machine Shop drill size charts.

ladajo
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Re: SpaceX News

Postby ladajo » Mon Aug 14, 2017 5:20 pm

Yay! Another launch and recover. Successful CRS-12 boost for IST Resupply. Really nice day on the Cape, and great video of the first stage boost, and fly back to the dirt pad. Starting to look routine...
:)
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)


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