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The Mack Super Pumper was a locomotive engined fire fighter (2018)

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Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#111
post #3

That "deltic" engine just for the water pumping is incredible, I'd never seen that cylinder layout before. > https://en.wikipedia.org/wiki/Napier_Deltic

Piston engines got pretty wild before turbines eventually took over the world. The most efficient ones were more efficient than today's turbines in terms of BSFC[0]. One of the most interesting to me was the Napier Nomad[1], which used turbo- and super-charging. However, the turbo had secondary fuel injection and effectively ran as a turbine to drive the compressor. [0] https://en.wikipedia.org/wiki/Brake-specific_fu…

Gas turbines aren't generally noted for their efficiency, but rather:

- Power-to-weight ratios. Critical in aerospace applications.

- Long duty cycles. Everything spins, reducing wear-and-tear relative to reciprocating designs. Maintenance on piston engined aircraft during WWII was a major logistical concern.

- Raw speed. Supersonic flight requires high rotary speeds, and the few propeller-driven aircraft which achieved this had ... issues. Ground crews and pilots suffered health effects from the noise alone, and notoriously often flat refused to work with the XF-84H "Thunderscreech": https://en.wikipedia.org/wiki/Republic_XF-84H_Thunderscreech...>. At near-supersonic speeds and above, propeller blade tips themselves break the sound barrier, losing aerodynamic flow over the blades, making quite a racket, and greatly reducing efficiency.

Propeller-driven planes remain more efficient than jets in many instances, though last I checked US military forces rely on turboprops over reciprocating engines in virtually all instances, possibly excepting some civilian-based (e.g., Cessna / Piper, etc.) trainer or observer variants.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#113

SysAdmin related: I was once talking to a fire chief and I asked about how much water the fire engines carried. He said that they carry about enough to put out the typical house fire. The first engine on scene immediately jumps to fighting the fire. The second engine on scene hooks the first engine up to the water supply before going on to fight the fire. I've often thought about that when there's a work crisis: If I…

>I've often thought about that when there's a work crisis: If I'm the second on the scene, what can I do to support those fighting the fire right now, before jumping in.

Great! Now I'll have to see this quote over an image of a sweaty firefighter on LinkedIn every 3 weeks for eternity.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#114
post #110

Earlier quoted context omitted.

just less massive amounts of waste, fraud and corruption

Thanks private equity! https://markorton.substack.com/p/fire-engines-monopolies-and...

There was a senate investigation in Sept 2025 and it sounds a good case for an antitrust investigation:

https://www.hsgac.senate.gov/wp-content/uploads/Musharbash-T...

Whenever there's market centralization the first question is why aren't upstarts taking over the market if there's such a backlog and high costs. Briefly reading into this, there's a large barrier to entry for fire engines in terms of extensive certification, local/state regulations, and the large emergency operations buying them need safe supply lines so they won't risk betting on newbies. You also won't easily find foreign suppliers to help fill the void (euro companies will focus on euro certifications). Plus you'd need to make deals with other mega-corp truck manufacturers and other specialized equipment.

Combine that with 2008 financial crisis + flood of cheap capital, it was easy pickings for financialization/consolidation.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#115

SysAdmin related: I was once talking to a fire chief and I asked about how much water the fire engines carried. He said that they carry about enough to put out the typical house fire. The first engine on scene immediately jumps to fighting the fire. The second engine on scene hooks the first engine up to the water supply before going on to fight the fire. I've often thought about that when there's a work crisis: If I…

https://i.imgur.com/zCjoWIZ.jpeg

I feel gross.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#116
post #3

That "deltic" engine just for the water pumping is incredible, I'd never seen that cylinder layout before. > https://en.wikipedia.org/wiki/Napier_Deltic

It amazes me what we manage to figure out on the mechanical side of things. Just look at motorcycle engines. Screaming along at upwards of 20k RPM and just taking it in stride and moving people down the road at what might as well be supersonic speed.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#117
post #21

2400 hp sounds like a lot, but a Model X Plaid is 1020 hp. I assume it couldn't output 1020 hp for as long though.

The Plaid can only output its maximum power at 100% state-of-charge (or close to it).

As state-of-charge decreases, so does the overall battery pack voltage. Since the motors can only pull some peak number of amps, doing so at lower pack voltage will always deliver less total power.

I own a Model S Plaid and I used to pay close attention to the OBD-II data, out of curiosity.

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#119

Earlier quoted context omitted.

"No worries Chief, that'll buff out!"

Exactly. Back when I was a newbie we melted all the lights on the engine as well as on my own truck since I was first on scene POV (Personally Owned Vehicle). And of course we charred some hose but that's common. Then CHAOS happened (Chief Has Arrived On Scene) and he quickly moved both trucks farther away from the fire, saving the county (and me!) the cost of a new truck.

It's incredibly unfortunate when those things happen, but it comes with the territory sometimes. Case in point:

https://www.firerescue1.com/firefighter-safety/photo-video-l...

Re: The Mack Super Pumper was a locomotive engined fire fighter (2018)

#120

SysAdmin related: I was once talking to a fire chief and I asked about how much water the fire engines carried. He said that they carry about enough to put out the typical house fire. The first engine on scene immediately jumps to fighting the fire. The second engine on scene hooks the first engine up to the water supply before going on to fight the fire. I've often thought about that when there's a work crisis: If I…

> I've often thought about that when there's a work crisis: If I'm the second on the scene, what can I do to support those fighting the fire right now, before jumping in.

A lot of it depends on the size and skill-set of your team and the escalation routes available to you, but in general (and off the top of my head):

- Get the first people on scene to give a summary of the problem as they know it. Make sure everyone actually agrees on what the problem is and what symptoms have been observed. Understand what areas people are currently investigating and make sure they aren't trampling over each other or actually making the situation worse [1]

- Make sure the situation hasn't evolved whilst the first on scene have been investigating the initial symptoms. It's easy to get lost in the weeds digging into a handful of monitoring alerts only to look up and realise there's now 300 and the original problem is only a small part of what's going on.

- If there isn't one already and you're not better doing something else, become incident commander. When done right it's an extremely important and useful role.

  - Take over external communication and protect the team from distractions
  - Start assessing escalation options
  - Take copious notes and keep a timeline 
  - Act as a shared memory and keep people honest 
  - Have a less panicked, wider (non minutia) view of the problem
  - Start collating and pulling up documentation/schematics so the people at the coalface can quickly query it rather than getting distracted searching for it.
  - Be ready to jump, for when someone inevitably asks "can someone check..." or "does anyone know"
  - Keep track of the "shared truth" of the incident as it evolves. What have we witnessed, what do we believe is the cause, _why_ do we believe that? Have we invalidated anything, do we need to reassess, are we sure logical lynchpins aren't confirmation bias or dyslexia?
  - Onboard new people and hand over if appropriate.
Being at the coalface when it's on fire is a very different view of the world to watching other people panic and singe their fingers. It's also very easy to get lost in a chain of technical problems [2] when it's mostly irrelevant to the wider picture.

If you get a moment, it can also be a good time to assess how useful your monitoring is during an actual event.

[1] "Hey, server x has flagged on monitoring and my ssh session is hung waiting for a login prompt!" I've been round the houses enough to know this is probably OOM and if I just wait, I'm likely to finally get in. I also know that saying this in a room of 20 technical people, means the server is now processing 22 new ssh sessions and now no one is getting anywhere.

[2] The famous Malcolm in the Middle intro where Hal is tasked with changing a lightbulb and ends up repairing the car. Except in my example the bulb is actually fine and there's a power cut we missed. https://www.youtube.com/watch?v=AbSehcT19u0

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