Hacker News: ulkhf

New comment by ulkhf in "Turning a solar power system into its own backup"

ulkhf — Fri, 30 Oct 2026 23:02:59 +0000

How is this different from Ivanpah?

New comment by ulkhf in "Mom found guilty of abuse for letting 5-year-old walk outside alone speaks out"

ulkhf — Tue, 08 Sep 2026 19:24:51 +0000

Whatever happened to journalists getting both sides of the story?

New comment by ulkhf in "How renewables are saving Texans billions"

ulkhf — Thu, 26 Jun 2025 01:22:50 +0000

Did you thank China for doing the hard work of scaling?

New comment by ulkhf in "Why hasn't commercial air travel gotten any faster since the 1960s? (2009)"

ulkhf — Tue, 11 Feb 2025 21:02:30 +0000

In America, all the gates (I have been to) subject you to constant noise pollution in the form of announcements over the public address system.

New comment by ulkhf in "Solar will get too cheap to connect to the power grid"

ulkhf — Wed, 04 Sep 2024 03:07:19 +0000

Capital cost of these plants is significant, which is why most of them run 24 hours per day. If you only run them 8 hours per day, you triple the capital cost.

New comment by ulkhf in "Billionaire Khosla Loses Bid to End California Beach Access Suit"

ulkhf — Wed, 15 May 2024 00:52:26 +0000

This is a nothing story. Court cases have many checkpoints along the way and this case has passed a very minor checkpoint that is almost always passed. The real meat is yet to come.

New comment by ulkhf in "In Defense of Electricity Markets"

ulkhf — Fri, 13 Oct 2023 01:30:57 +0000

When sources were inherently dispatchable, like coal/oil/gas, reliability was free. Markets have not been updated to reflect the value of reliability. It may be just an oversight of slow moving regulators. Or it may be intentional to allow the growth of unreliable wind and solar without making them bear their own cost of unreliability.

New comment by ulkhf in "In Defense of Electricity Markets"

ulkhf — Fri, 13 Oct 2023 01:25:18 +0000

It addresses reliability by shedding the customers who don't pay a premium for reliability first. Most of the time, that can solve the problem. It is, as you say, imperfect because it doesn't allow that premium to be used to fund investment in reliable generation.

New comment by ulkhf in "US electric vehicle transition would save over 100k lives and $1T in healthcare"

ulkhf — Fri, 13 Oct 2023 00:46:37 +0000

Public transit only makes sense in urban areas. Urban areas tend to have high rates of crime. This is one of the driving factors behind the popularity of personal transportation and suburban schools.

New comment by ulkhf in "[dead]"

ulkhf — Wed, 27 Sep 2023 22:11:18 +0000

How did he get into her home?

New comment by ulkhf in "OpenWRT 22.03.4"

ulkhf — Thu, 20 Apr 2023 04:29:46 +0000

I'm also an Omada fan. I just have two APs right now but I love controlling them from a single dashboard and look forward to adding their ER605 router so I can put my security cameras on a separate VLAN.

New comment by ulkhf in "PG&E CEO rakes in over 190 times the typical employee salary"

ulkhf — Wed, 04 Jan 2023 07:43:07 +0000

Employee compensation is an expense, not revenue or profit.

New comment by ulkhf in "Solar panels reduced my electric bill in 2022"

ulkhf — Wed, 04 Jan 2023 03:49:45 +0000

You may be able to afford a night time battery (several hours of power) but there's no way you can afford a winter battery (several months of power).

New comment by ulkhf in "Are Aerospike Engines Better Than Traditional Rocket Engines?"

ulkhf — Sat, 19 Oct 2019 06:37:57 +0000

In a previous article, he renamed the gas generator on the Merlin and F-1 rocket engines a "preburner" and now everyone is copying him.

New comment by ulkhf in "F-35's Towed Decoys"

ulkhf — Fri, 29 Mar 2019 17:12:14 +0000

You seem to have an unrealistic idea of how much a "drone" would cost. If you mean some lightweight slow Cessna 172 class vehicle, those are around $300K. But kind of useless in a conflict against the US.

A propeller driven MQ-9 Reaper cost over $16M in 2006.

If you mean an F-16 class vehicle capable of catching an F-35 (supersonic) and carrying half a dozen missiles, then you're in the F-16 cost range. Not having a pilot might only save a few hundred pounds.

But why use a drone to carry missiles. The US can launch missiles from Navy ships or B-52s under the control of the F-35 super AWACs.

As someone else said, the idea is not to defend against an attack by 20 drones, the idea is to blow up the drone base.

New comment by ulkhf in "F-35's Towed Decoys"

ulkhf — Fri, 29 Mar 2019 17:00:16 +0000

How would a P-51 ever catch up to an F-35, or even see it at night or in bad weather?

Know what's a good drone? A dozen Navy SM-6s launched from a destroyer, cued by a nearly invisible F-35.

New comment by ulkhf in "The SR-71 Spy Plane Was So Fast, It Outran Every Missile Fired at It"

ulkhf — Thu, 28 Mar 2019 16:19:40 +0000

You don't need high turn rates when you have Electro-Optical Distributed Aperture System (EODAS) like the F-35's cueing High-Off Bore-Sight (HOBS) short-range air-to-air missiles like the AIM-9X.

New comment by ulkhf in "What Minimum-Wage Foes Got Wrong About Seattle"

ulkhf — Fri, 04 Jan 2019 18:50:09 +0000

It's almost as though central planning of an economy is hard.

New comment by ulkhf in "White House Moves to Deport Vietnam War Refugees"

ulkhf — Thu, 13 Dec 2018 21:57:16 +0000

stick it to criminal "immigrants" because they are criminals and we don't want them. As they are the subject of a deportation order, it's a stretch to call them immigrants.

New comment by ulkhf in "White House Moves to Deport Vietnam War Refugees"

ulkhf — Thu, 13 Dec 2018 21:55:48 +0000

Do you really think the spirit of american law is that we have to keep unwanted criminal aliens?