Personal computing discussed

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by notfred
Tue Feb 13, 2018 9:18 am
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Re: Falcon Heavy Launch

Just some cost quotes I saw today. Per Musk on Twitter, Falcon Heavy is roughly 150M per. Per Tory Bruno (ULA CEO) Delta IV Heavy is roughly 350M per. That $150M for Falcon Heavy is for fully expendable i.e. everything thrown away in to the ocean. For the more normal case of 2 side boosters recover...
by notfred
Mon Feb 12, 2018 3:21 pm
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Re: Falcon Heavy Launch

Just some cost quotes I saw today. Per Musk on Twitter, Falcon Heavy is roughly 150M per. Per Tory Bruno (ULA CEO) Delta IV Heavy is roughly 350M per. That $150M for Falcon Heavy is for fully expendable i.e. everything thrown away in to the ocean. For the more normal case of 2 side boosters recover...
by notfred
Mon Feb 12, 2018 2:24 pm
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Re: Falcon Heavy Launch

Someone's been busy in Photoshop, may I present the Falcon 9 Super Heavy Image
by notfred
Fri Feb 09, 2018 10:04 am
Forum: The Back Porch
Topic: Space Thread
Replies: 6
Views: 424

Re: Space Thread

Asteroid passing about 1/5 of the distance to the moon today:
http://www.cbc.ca/news/technology/aster ... -1.4526964
by notfred
Fri Feb 09, 2018 9:07 am
Forum: The Back Porch
Topic: Space Thread
Replies: 6
Views: 424

Re: Space Thread

For other examples of fun bombing, look up the Torrey Canyon https://www.youtube.com/watch?v=qPbufQhJLsY
by notfred
Thu Feb 08, 2018 11:03 am
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Re: Falcon Heavy Launch

Previous fails include running out of hydraulic fluid (it's an open loop system) and running out of propellant on an energetic launch.

This wasn't the propellant that ran out but the stuff they use to light it. There was plenty of RP-1 and LOX on board, just nothing left to set it on fire.
by notfred
Thu Feb 08, 2018 10:20 am
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Re: Falcon Heavy Launch

They set the landings up so they will land in the water and the landing burn steers them to land on the ship or land. With this being 1 engine rather than 3 then the burn got them close to the drone ship but not on it. Running out of igniter stuff (TEA/TEB) is weird, they've done the landings plenty...
by notfred
Tue Feb 06, 2018 4:38 pm
Forum: The Back Porch
Topic: Falcon Heavy Launch
Replies: 62
Views: 1817

Falcon Heavy Launch

Well that was very cool. No news yet on if the centre core made it on the droneship, but those side cores landing together were sweet https://pbs.twimg.com/media/DVYWR2IUQAAutMB.jpg Second stage has a 5hr coast through the radiation belts before trying for the Mars burn. Got to hope the LOX hasn't b...
by notfred
Mon Feb 05, 2018 9:13 am
Forum: The Back Porch
Topic: DYMT: Imi's Legacy
Replies: 2502
Views: 85699

Re: DYMT: Imi's Legacy

Are you going to be watching the Falcon Heavy Launch tomorrow then?
by notfred
Wed Jan 31, 2018 8:46 am
Forum: The Back Porch
Topic: Anyone repair anything today?
Replies: 975
Views: 73089

Re: Anyone repair anything today?

This drive's warranty ran out years ago Date code 07487 translates as 2007 week 48 day 7 so Friday, June 1, 2007. I'd say that's out of warranty. Funnily enough I had a 500GB 7200.10 that I was using for offline backup storage die a couple of months ago as well. It lasted far longer than the 7200.1...
by notfred
Mon Jan 29, 2018 9:08 am
Forum: The Back Porch
Topic: Anyone repair anything today?
Replies: 975
Views: 73089

Re: Anyone repair anything today?

Modern electronic ignitions are so powerful that spark plugs have to be pretty well shot before you notice much difference in performance. Back in the old days, you had to keep them gapped correctly on a frequent maintenance schedule or the old anemic ignition systems couldn't generate a spark stro...
by notfred
Fri Jan 26, 2018 2:11 pm
Forum: The Back Porch
Topic: DYMT: Imi's Legacy
Replies: 2502
Views: 85699

Re: DYMT: Imi's Legacy

That static fire video of the Heavy was intense. I particularly liked the flickering at the end of the flame trench - nothing like seeing sound to know that is pretty loud!
by notfred
Fri Jan 26, 2018 2:09 pm
Forum: Linux, Unix, and Assorted Madness
Topic: Video Card for Linux, AMD or Nvidia?
Replies: 13
Views: 724

Re: Video Card for Linux, AMD or Nvidia?

I agree with others saying just sort out the Intel drivers and don't bother with another card. I do want to clarify something that JBI wrote though: but you'll want to install the latest Linux drivers from Nvidia instead of relying on the drivers bundled with your distro. Same thing goes for any rec...
by notfred
Thu Jan 25, 2018 9:07 am
Forum: Developer's Den
Topic: C Code Perfect Storm of Stupid
Replies: 64
Views: 3251

Re: C Code Perfect Storm of Stupid

I'm not surprised at all and I don't think it's limited to disk controllers. The running joke is that the Wifi lot all microwaved their brain cells with some prototype hardware before they turned down the power. I was told cellular was even worse, but I'm not sure how that is possible. As has been m...
by notfred
Tue Jan 23, 2018 7:16 pm
Forum: The Back Porch
Topic: DYMT: Imi's Legacy
Replies: 2502
Views: 85699

Re: DYMT: Imi's Legacy

Well, they are "Agile" after all :)
by notfred
Mon Jan 22, 2018 9:20 am
Forum: The Back Porch
Topic: Active Safety in Cars: What's good?
Replies: 87
Views: 2665

Re: Active Safety in Cars: What's good?

To me it should be an all or nothing. Either no human aids beyond maybe adaptive cruise control, or fully computer driven with no human input. Anything beyond the the former just encourages bad human drivning and is wholly unnecessary. I agree completely. Looking at aircraft crashes suggests this i...
by notfred
Fri Jan 19, 2018 7:33 pm
Forum: The Back Porch
Topic: Active Safety in Cars: What's good?
Replies: 87
Views: 2665

Re: Active Safety in Cars: What's good?

wouldn't a supercharger be a better idea? I really like the current Formula 1 motor idea where you have a turbocharger with a motor/generator unit (MGU) attached to it. As you come out of a corner, the MGU can spin the turbo up like a super charger. Going down the straight at full throttle and high...
by notfred
Fri Jan 19, 2018 7:24 pm
Forum: Developer's Den
Topic: C Code Perfect Storm of Stupid
Replies: 64
Views: 3251

Re: C Code Perfect Storm of Stupid

In a kernel or driver there are certain CPU specific things that may need either assembly language or C functions that boil down to a known CPU instruction e.g. sync_synchronize() in GCC on ARM is a DMB and on x86 an MFENCE to solve memory ordering issues. There's also usually a bootstrap bit at the...
by notfred
Fri Jan 19, 2018 8:41 am
Forum: Developer's Den
Topic: C Code Perfect Storm of Stupid
Replies: 64
Views: 3251

Re: C Code Perfect Storm of Stupid

Not just the Linux kernel, most kernels are in C.
by notfred
Thu Jan 18, 2018 1:21 pm
Forum: The Back Porch
Topic: Average fuel consumption
Replies: 64
Views: 2065

Re: Average fuel consumption

My 03 Subaru had a TBW and on that the throttle opening wasn't noticeably different but the throttle closing was very slow - that helps with emissions but sucks when you are going for a quick gear change.
by notfred
Wed Jan 17, 2018 2:20 pm
Forum: The Back Porch
Topic: Active Safety in Cars: What's good?
Replies: 87
Views: 2665

Re: Active Safety in Cars: What's good?

Check with your public library, some of them have access to Consumer Reports.
by notfred
Wed Jan 17, 2018 8:50 am
Forum: General Hardware
Topic: My home theater is sounding weird
Replies: 13
Views: 687

Re: My home theater is sounding weird

Almost certainly got switched in to one of the various large hall / cinema modes that receivers have.
by notfred
Tue Jan 16, 2018 3:22 pm
Forum: TR Sports
Topic: Formula One 2017
Replies: 239
Views: 27973

Re: Formula One 2017

Confirmed Sirotkin as Race Driver, Kubica as Reserve Driver :(
by notfred
Mon Jan 08, 2018 2:05 pm
Forum: The Back Porch
Topic: Anyone repair anything today?
Replies: 975
Views: 73089

Re: Anyone repair anything today?

Had the dryer vent freeze closed yesterday late afternoon. Problem is we have an upstairs laundry so that means borrowing the neighbour's 20ft ladder, setting it up in the middle of a snow bank down the side of our house, on quite a slope where I need blocks of wood under it to keep it level. Of cou...
by notfred
Sun Dec 31, 2017 2:43 pm
Forum: The Back Porch
Topic: Winter weather
Replies: 1228
Views: 119852

Re: Winter weather

Seeing as it was too cold to ski we went in the hotel pool, then we noticed the outdoor hot tub. Ended up with totally crazy frozen hair.

Getting out and putting the cover back on was painful.
by notfred
Sun Dec 31, 2017 10:25 am
Forum: The Back Porch
Topic: Winter weather
Replies: 1228
Views: 119852

Re: Winter weather

At a ski resort for a wedding. Sitting here watching the empty chair lifts going up the hill and almost nobody skiing. It's -23C and with the windchill -28C. It's actually too cold for Canadians
by notfred
Thu Dec 21, 2017 10:55 pm
Forum: Mobile Tech
Topic: Recommend a Chromebook
Replies: 3
Views: 396

Re: Recommend a Chromebook

I ended up going with the Asus I linked above. It does have an SD card slot, and while I agree that the CPU looks anaemic on paper, it is responsive enough and does wonders for the battery life.
by notfred
Sun Dec 17, 2017 3:59 pm
Forum: The Back Porch
Topic: Anyone repair anything today?
Replies: 975
Views: 73089

Re: Anyone repair anything today?

Had an issue with the gas fireplace, the pilot was fine but when we turned on the main burner then sometimes that would drop out every now and then. The fireplace is one with a remote switch on the wall that's driven by a thermopile so it still works if the power is out. I was worried that the therm...
by notfred
Sun Dec 17, 2017 11:09 am
Forum: Mobile Tech
Topic: Recommend a Chromebook
Replies: 3
Views: 396

Re: Recommend a Chromebook

Here's an example of what I was thinking of:
https://www.bestbuy.ca/en-ca/product/as ... 90596.aspx

What's wrong with going for this? Any better recommendations?
by notfred
Sun Dec 17, 2017 11:01 am
Forum: Mobile Tech
Topic: Recommend a Chromebook
Replies: 3
Views: 396

Recommend a Chromebook

This is for my son who is in grade 8. All the school work these days seems to be on Google Classroom and they have a mad rush for those without laptops to grab the chromebooks at school. He's got access to the desktop PC in the family area at home, so I want to go with a Chromebook rather than a mor...