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Apollo Command Module Door

Quetzal

Quetzal

A little to the left and slightly out of focus.
Premium Member
I browse a subreddit from time to time called "Engineering Porn". This was on there today, pretty sweet!

09EIUTc.jpg


Tagging @Revoltingest. Any other engermineers?
 
Revoltingest

Revoltingest

Pragmatic Libertarian
Premium Member
Scuba Pete said:
Probably runs on bunker oil and uses diesel only in port.
Click to expand...
It's called a "diesel" because of its particular compression ignition cycle, not because of the fuel used.
It doesn't use the "diesel" you can buy at the pump. That would be too spendy. Instead, it (& other
engines from the same company) use a low grade oil.
 
Revoltingest

Revoltingest

Pragmatic Libertarian
Premium Member
Scuba Pete said:
Yeah... bunker oil. It's the sludge left in oil tankers. Those engines only have one speed when on bunker oil: FULL SPEED! They adjust speed with gearing, not with a throttle.
Click to expand...
Are you sure you want to claim that?
I'll give you the opportunity to correct it before I do.
 
Revoltingest

Revoltingest

Pragmatic Libertarian
Premium Member
Scuba Pete said:
Unlike some, I'm not afraid of being wrong. I've been on a tanker and that's how it was done. At least, that's how I was told it was done. If you want to make a battle of it, well, I wouldn't be surprised at that.

Fuel oil - Wikipedia
Click to expand...
You initially objected to my post.
I offered a chance to reconsider.
I'm just here to educate.

Some reading material.....
http://www.test.swiss-ships.ch/beri.../Wartsila-RTA96C-engine-technology-review.pdf
Note....
- The engine manufacturer calls their engine a "diesel", but it does not run on "diesel fuel".
Diesel cycle - Wikipedia
(We won't get into other compression ignition cycles here.)
- Note the power curve in the introduction. While the speed range is narrow, the engine has a wide power band.
- Of course there is no throttle...fuel injected compression ignition engines don't use one. Power varies due to fuel metering. (Throttles are necessary on typical carbureted gas engines to maintain a proper fuel air ratio. Diesels don't need that because they don't need to maintain a flame front from an ignition point.)
- If by "sludge" you mean bitumen or asphalt, that isn't used in engines. Heavy "bunker" oil is not sludge. It's a range of the more viscous fractions of distillation below lighter fuels. It's not the residue at the bottom of bunkers. Your own link explains this.
- Speed can be varied by mechanical or electrical means. The latter is becoming more popular, even on large land based haulers.

Now that this is settled, let's return to engineering porn!
One of my favorites is this circa 1900 Backus natural gas engine.
Note the pendulum governor to regulate speed.
It weighs around 11,000#. It'll put out 35 HP at 190 RPM.
 
Last edited:
Scuba Pete

Scuba Pete

Le plongeur avec attitude...
Revoltingest said:
You initially objected to my post.
Click to expand...
No I didn't. I clarified it. I never said you were wrong.
Revoltingest said:
but it does not run on "diesel fuel".
Click to expand...
Which was my entire point in my initial post. You just like to argue and take offense when none was intended. Here's what I wrote.

Scuba Pete said:
Probably runs on bunker oil and uses diesel only in port.
Click to expand...

Bunker c is too viscous to be regulated. The engines are usually started on something close to diesel and then switched over when away from port and the rpms are right. It's a formal process. The bunker oil injectors I'm familiar with are run full open. Since these have horrible fumes for most of us, they are not run on bunker fuel in or near port, but on a much, much lighter fuel that runs much cleaner and the engine speed can actually be regulated. I actually have been on ships as an engineer, but not on one that big. I've been on those ships as a guest and have been in their engine rooms. I use plugs and muffs to mitigate the noise on the ships I crewed on, but these was stupid loud. They weren't even on bunker c and I was cringing the whole time. Gawd, but they are loud. You feel the detonation through your whole being. It was bone rattling in the worst way. The bunker c lines are stupid big too, but then they have to be.
 
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