What Are Those Weird Red/Black/White Discs on the Wall?
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- Опубликовано: 6 фев 2025
- This episode is a deep dive in casualty power systems.
For our previous deep dive into emergency lighting:
• When the Lights Go Dow...
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man you're having a very bad day when you're rigging 490v wires in a compartment full of water and also possibly on fire
If you don't rig those wires, your day may go from very bad to even worse
Not to mention if the other end of the cable is lying on the steel deck and you tie in hot.... I wonder if there was a procedure for what order you connected it, ie. Connect to the biscuit you're sending TO before the one you're drawing FROM.. just so you don't have live 440V flopping around the deck while you're also trying to avoid fire and flooding...!!
@@PixelmechanicYYZ yes, connect from load to source
And the wire is pure copper,silver plated and inside teflon insulation. It will function perfectly while, literally, on fire.
This is war, son... as long as you're alive, ya keep fightin'! [/Hunter]
Finally an explanation of "re route emergency power" and other such start trek things
Thanks for the quick turnaround, Ryan. One point: you wouldn't start at the live power source and work your way to the load (whatever is consuming the power). For safety, you do it the other way. Start at the load, and work your way back to the live power source.
Yes, that was the way it was explained in training. There was supposed to be heavy rubber gloves and boots used while handling too. Looks sailor proof but also potentially dangerous.
And probably also try to make sure that the load currently isn't on
I was just about to post about this. If you go from the power source first you have 3 live male ends exposed on the other end that would be pretty dangerous!!!
@@PreciStrike_96 What I am understanding from the comments of experienced sailors (here) is that the process of rigging this system will be planned and directed from Damage Control Central. There are diagrams there that tell the engineers where the points or Biscuits are throughout the ship. A diagram will be drawn up from there and then directions will be given by sound power phone, telephone or paper messenger, as to which connections should be made from point to point. The rigging will start from the point that needs power to the point that has power using the temporary wires. Once the connections are properly made the electricians will energize the bypass.
I am still interested in reports of actual and successful rigging of this system in real world battle damage situations.
In addition to safety, this presumably also allows you to select a route around the worst-damaged sections while hooking up. (You know, bypass compartments that are totally flooded or still very on fire.) Work your way from a section that needs power back to the machinery.
You have convinced me to have 3 phase power installed in my home along with casualty power terminals on all my walls.
as an industrial electrician i found this interesting. good way to delineate each phase with the rings and the notches.
An even better way would be to have different shape recepticals so you physicaly cannot put the wrong cable in a socket. But ofcourse that means you can't improvise and use a spare red to replace a broken white so counterintuitively you may not want that.
@@vinny142 IIRC (Ex Navy ET1 here) They are 100A in a harsh environment (salt air). The screw terminal can break thru minor corrosion. Also Pin Plugs and receptacles are very bulky (and expensive), where a bit of serving cord, shrink tubing and a ferrel end will do the job. Beside, this allow THREE jumps in that smallspace. This task would only be done by EM's in the Damage Control crew.
I used to work at the San Francisco Naval Shipyard back in the 1960s. I remember the caveat "Load to Source." Connect the load first and then the source. That way you don't have the live terminals sticking out. It's good to see you still have some of the cables and wrenches on board.
There are charts in Damage Control Central that show the location of every biscuit on the ship. I remember having to participate in damage control drills setting up casualty power as part of Refresher Training (REFTRA) and the Enlisted Surface Warfare qualification.
All our DC lockers and satellite teams like 3b etc. had sound powered communication with DC Central. Plus, there were chart sources throughout the ship for reference. So, good coordination would be essential for a safe and effective rigging. REFTRA is passed my time. So, It is good that this level of training is happening.
I do actually have something quite like this in my house. An inlet and outlet on opposite sides of a wall to get power from a generator outside into my basement without having to have a window open to run a cord through. Extension cords to get power from there to critical loads. Including an inlet on the "power box" for the furnace to feed power into that circuit from a cord. (It's a proper transfer switch made for exactly this purpose, so no back-feeding can occur.)
I'm assuming they are called biscuits in humorous reference to the old naval rations, since they resemble ship's biscuits: big round disks, dotted with lots of holes, and as hard as iron.
Likely true
Lol hard as iron
@@jamesbizsiron is not has hard ad biscuits 😂
A old joke goes that a soldier found something soft in his hardtack and it turns out it was a nail
One hilarious thing I heard of was how British sailors in the 19th century dealt with weevils. They get the biscuit out of storage, place some caught fish over it and wait for them to climb onto the fish. Fling them overboard but hold onto the biscuit. If no weevils left, it's safe to eat! 😁
Ryan's video reminded me of how Japan lost many ships because of inadequate damage control, especially fires that raged out of control while the sailors struggled to find a way to extinguish or even control the fire. This one system looks very well thought out, right down to having a system for keeping emergency electrical connections tight, using those special wrenches.
Wow, that's pretty cool. It interesting how they solved the issue of low visibility for both the cable and the outlet.
The thinking that went into this ship in all areas. I was especially impressed with the analog fire control computer.
Interesting to see how the designers considered the lowest common denominator in their damage control efforts. Make it as simple as possible, because when the ship is hit, flooding, and on fire, you don't have the time in many of these spaces to refer to the manual (assuming you even have a manual). Power needs to flow. You can do it by feel if need be.
Truly an analog solution to a complex problem.
The problem began as an analog situation. Crew training ensures sailors can perform in darkened/damged/smoky/flooded compartments.
Remember, KISS- Keep It Simple, Stupid...
It is a good mindset, because in the moments when functionality like this is needed, you're already in an emergency. If you assume chaos, then just maybe you can develop a system that's robust even in the face of grave danger.
In times of crisis, you do not "rise to the occasion." You descend to the level of your training. Which is why a ship has daily drills of various types, to ingrain and reinforce the muscle memory to do things like hook those cables up properly.
After retiring from the Navy some 35 years ago, went back to college and got into industrial electronics and electrical. We setup a similar setup in the plant, we always used the same color coding and checked the phases constantly, sort of like a monthly PM to walk thru the plant and check the 480v outlets to ensure someone didn't make a mistake.
The color/shape coding of that is impressive. Simple, yet effective. At home, I have a pure sine wave inverter and a couple of lead-acid batteries. Not much, but it will keep the fridge going for a little while and power some lights, hopefully long enough for main power to come back on. The disadvantage is obvious--it only runs as long as the batteries last. The advantage is no gasoline engine that needs maintenance and/or that won't start when you really need it.
Ryan, I belonged to the Damage Control Education and Training Team (DCETT) on the USS Kitty Hawk, and I just learned something from your video. I knew about Casuality Power. What I didn't know about was the lumps on the cables and the matching notches on the biscuits. Never too old to learn.
I love the fact that AED (emergency defibrillator) sign is pointing at 480V three phase power cable.
480V should definitely do the trick!
Wow! That brought back memories. I had completely forgotten about those on my first ship. I later went to a sub and we didn’t need that system, so, after the first 18 months on my first ship, I never saw them again. The newer cables have all three phases of electricity contained in a single cable & connector to make it easy.
We called them SO cords. Retired master electrician and ex navy machinist mate.
The main reason for the biscuits is to keep the water tight door sealed. Under different "material conditions" like battle stations, fire fighting, flooding, etc., certain doors must be closed and locked or "dogged" and can NOT be opened without explicit permission to do so. And they certainly can't remain opened to allow a power cable to run through it. The sealed door prevents fires from spreading and/or stops flooding from one compartment to the next. If the compartment was filling with sea water, the power cables would be routed around that compartment; otherwise the salt water would short out the 440 volt connections.
Black, white, red, a, b, c, 1, 2, 3, had to learn it many years ago casualty power cables should be strung on the overhead.
I spent almost 40 years in the aviation industry so I look at these different options for power routing and every other redundant system as thousands of man-hours to design, document, and implement when they may never be used. It's just staggering to think of the total effort to build one class of ships and then multiply that by the tanks, trucks, fighters, bombers, weapons, etc. required to support the war effort. Unbelievable!
Great videos, if you're ever in Bath Maine, and want to look at some destroyers, hmu. Thanks you for your commitment to these amazing ships.
That is brilliant!
I work in a hospital and we have means of routing power from different sources, sometimes via manual switching and sometimes its automatic. There are also two of everything as in two main feeders to the hospital, step down transformers are in pairs, generators are in pairs etc. Failure of one component is not extremely critical as faults may be isolated and loads get switched and supplied by the remaining "good" component
It's interesting that you can hook up 3 different sets of jumper cables at the same time, thus allowing you to shunt power to a specific item.
Why yes, I DO have an emergency generator. I love it!! Power lines here are surrounded by trees. And then it gets windy....
Tech note. Power companies are finding that solar and wind are unpredictable. Power outages are actually on a slight uptick after years of decline. Be prepared, not scared.
Good for you to have a plan. Stay calm initiate. I like LP gas instant on back up generators. But any generator is better then no generator. Wind and Solar as a back up only works in a civilized situation. If it works at all!
@@allenshepard7992 Solar and wind are unpredictable? Sounds like a nice topic to read up on some calm dark night....
@@Bobo-ox7fj Always follow the money trail.
There are cheap non polluting options that can be made reliable - we need to find them. Hydro is great, but dams create a form of pollution as environmental impact. Geothermal is not as widespread.
From coal, to whale oil, to gas, to lime lite to electricity we keep finding better answers. however solar and carbon fiber windmills are not recyclable nor reliable. Big electric companies are finding solar/wind is not as cost effective.
Keep looking and asking questions. "the answer is out there"
@@kevincrosby1760 Well said, well played.
Read up on Dominion Energy's yearly report (may put one to sleep before the good parts) Ditto for PG&E and LILCO of New York.
Watching your videos made my recent visit to the Yorktown and Laffey much more enjoyable. I had been aboard both years ago but I was able to appreciate and understand more of what I was seeing because of what I learned from your videos. Also, it was fun to share that knowledge with my friends. Keep up the good work!
I have toured old naval vessels like this with friends and family. After a while, we would have a group of people moving with us. I used to be an Electrician's Mate in the Navy, so I was explaining little things like this to my group. I didn't mind at all when the group expanded and my audience got bigger.
That's really interesting hey, I like how they have the ribs and the notches so you can feel where it has to go in low/no light conditions. Bloody genius but so simple.
I learned something. A small detail that could save the ship. Ingenious.
I have had to use emergency generators both while on active duty with the US Army and home before I was drafted in Dec 1970. Biggest problem is always once it has been used it needs to be started every week to avoid fuel gumming up the entire fuel system. I trained generator mechanics while on active duty. Every week I had to start our 5 KW generator and let it run for 15 minutes then top up the fuel tank.
Thank you for your service, I was a 63B Wheel Vehicle Power Generator mechanic (I prefer technician). I got the generator side of issues not so much wheel vehicle side of issues because I learned voltage. 5KW was the main generator in my sring.
@@Bobo-ox7fj for a critical system, you would also do this to ensure and log proper operation in a log book somewhere. Its easier to run and top up then need additional supplies to drain and stabilize the fuel.
Yes, they are emergency power connectors for cross connecting damaged wiring. We covered this in DC school. But I don't think there was a lot of drill practice rigging these things. Maybe the electricians did simulations. It seems there should be a special "T" wrench as well as a super heavy supply of cable hanging like firehose nearby on the bulkhead. I did drills on America, Kennedy and Saratoga (late 60's) and never saw this rigged in any way. It would be interesting to hear from any old sailor who actually employed this system as a result of battle damage.
(joke) DC school? But the power is AC not DC :)
@@allenshepard7992 Good one Allen, thanks. I always thought messing with that system was a great way to become a crispy critter.
@@paullewis5045 Most welcome.
Yes, a crispy critter. After all "nothing moves. Looks the same when it is on as when it is off (safe)" Training and Respect is key.
While my mind understands connecting 480V wires on a moving ship in knee deep salt water, my mind says "Death trap"
@@allenshepard7992 M, maigretus1 below has the right plan for handling this system.
My uncle was on the America in Vietnam.
Love the video! I'd love a video on the Tennessee class battleships and all of those other standard types that continued to serve through WW2. I find their series of modifications fascinating. Side by side images are crazy!
I have an 800A 48VDC telco spec power plant for my telco equipment set up with 16 50A rectifier modules, half of which are powered from the backup generator. Building lighting and HVAC are run from 48VDC solar with an automatic transfer switch to the main power plant if the solar battery string gets low. I also have the option to swing lighting and HVAC directly to commercial power if the situation calls for it. Extreme flexibility is the answer to unpredictable failure modes.
God bless you brother. Flexability and practice (my weak spot) is key.
Hope you have a Diesel parking heater to keep warm.
Curiosity from someone who repairs 48v telecom power systems: Why?
Did you find one at surplus for cheap? Do you work in telecom and were able to siphon some parts off the top?
@@phillyphakename1255 I used to be a local ISP and CLEC a long time ago. I was in Nashua NH picking server cabinets out of a building where the previous tenant had just abandoned a load of stuff where I found a Power Conversion Products Twin Pak Plus power plant. I wasn't lucky enough to get the Hawker battery string but the 800A power plant set me back only $200. Right place, right time, spectacular deal. It's bigger than I need but the parallel rectifier modules allow me to feed from both commercial and backup power without needing a transfer switch.
@@vburke1 Cool. Those telecom power systems are quite reliable and super fixable. We are still repairing and refurbishing stuff that was made in 1995! Ready for another deployment when it ships out the door.
The Canadian navy used that same system set up right up to the Tribal class destroyer that were just decommissioned. The newer frigates have a more modern system
Love these little “what’s this stuff” videos
Where I grew up we could expect line power failures (plural) during the winter, and without helicopters it could take several days to get the line crews back into the mountains for repairs. For decades I kept candles and matches where I could find them in the dark.
I remember you talking about there on the Broadway video. I’m fascinated by them and have told many people about this ingenious system.
That is great information and great presentation
Also, the power at the emergency source must be off or the 3 phase breaker open, since many load devices such as transformers and motors can be damaged by not having all 3 phases live at the same time. You need to turn on power to all 3 phases simultaneously after wiring up the whole daisy chain.
Yeah, that wasn't explained and a lot of people in the comments seem to think you are doing this work live.
I've heard 3 phase motors running when a phase drops...it's terrifying. They'll destroy themselves in short order!
It's amazing to see how the battleship has systems in place to re-route power when damage control is needed. Ryan asks about the At my home we have two different circuits from city power, one for the house, another for the shop, and rarely do both lose power at the same time, I think maybe once in 17 years. I have run a heavy extension above ground from one to the other to keep the fridge and freezer operational, and the generator keeps lights and fans on. But nothing powers the HVAC running so we have packaged firelogs for the fireplace. We also have multiple flashlights in every room and many spare batteries. All this came about from what we call the Ice Storm, a great cold blizzard that lost our power city-wide for five full days, and destroyed many trees and overhead power lines due to the weight of the accumulated ice.
Interesting vid! And yes, I do have a couple generators at home. We always seem to lose power every year, and sometimes for several days now and then.
We used to lose power regularly but I solved the problem by buying a generator. Longest power outage now has been five minutes. Not even long enough to start and connect the generator.
@@haywoodyoudome Hehe, glad you've been able to ward off the outages!
those casualty power pucks arent on all us navy ships. my first ship was a newport class LST. it did not have any provisions for casualty power. its one way to know they consider your ship disposable.
There was a reason that LST's were called Large Slow Targets. Granted that the Newport class was faster than WWll LST's but they still were not THAT fast.
They were later replaced with LPD ( landing platform disposable)
As Marine, I was aboard the Newport for a cold weather training mission in Norway and the return to the USA, with a stop in New Castle on Tyme, UK.
It might be because they redesigned the system. My ships didn't have those either, but we 100% had casualty power cables. But they also had quick connectors and easier to use power disconnects. It would be way faster to restore power on the newer system with a lower chance of making a mistake.
We have portable power units. And aboard any wing group, you have genpacks on wheels to power equipment and aircraft. Some even supply AC..lol.
Probably one of the most ingenious additions to a warship.. so simple. Yet so powerful.. unlimited potential in a pinch.
Great job. I have been curious for years how they reran the power on ships that were battle damaged in the movies. They just show them running the cables, and boom, power..
I just assumed they unwired something, and tied into that power.
Thank you for showing us what they are doing..
In today's video Ryan jumpstarts a battleship.
I had the opportunity to visit the ship a few years back and I found it to be enjoyable and educational. Thank you.
Damage control 300 . I guess.
Cool chit. Glad my tank was smaller and not so complex.
The 440 BB volts vs 300 tank amps seems about the same.
Though a tank ain't floating in salt-water.
Much respect to the electrical gremlin either way.😎
My father, took us on a tour of the USS North Carolina. As a former First Class Petty Officer who was an electricians mate he showed us things about the ship. One of the things was emergency power. It was one of those things we would have missed if there wasn't someone there to point it out.
After watching Juan Browne's recent video on the loss of power at The Blancolirio World Headquarters, I ordered a Champion duel fuel generator and manual transfer switch. I can now run my gas furnace in the dead of winter even though the power lines might be down. Which is sort of important here in Wisconsin.
It sure is! Keeping that house heater working in your case, electric/LP gas, using a dual fuel generator is a great plan. COngradulations.
+1 for the Blancolirio channel.
We run a farm, so yes indeed we have backup power. Two generators. They get exercised monthly... either one can power the essentials.
Thank you for the very informative video !
Looks to me like the notches on that "biscuit" were cut by hand, and not part of the casting process. Maybe the ridged wires and notches were an upgrade based on experience?
At home we've got not just flashlights, but LED headlamps. One of my most satisfying accomplishments has been converting my 81-year-old mother to the convenience of reading and doing things, on a dark, powerless night, with a headlamp instead of a flashlight. And I have a lot of spare flashlights from when I was a professional mariner!
In the early 2000's we had a whole switchboard catch fire while at sea on HMNZS Canterbury, lost power to half the ship, we had a similar system on board onboard so had to use them to get critical systems back up and running
The kind of small detail that makes Ryan’s videos so interesting. How to rig an extension cord when people are shooting at you with big guns.
Could you do a video on the various color meanings on pipes; e.g. purple for fuel, red for fire fighting, etc.?
I believe he did in a previous video covering the flight deck and aviation spaces on the ship.
Purple is for JP-5, red is for CO2 and HALON fire extinguishing, green is for chill water, if I remember right, and Blue is for potable water. Red/Green stripes was for AFFF.
Well, I guess your wish was granted.
That 440V three phase lead would make for one heck of an AED experience.
I thought the same as Ryan is standing below the sign 😂
No clue, sooo cool. Thank you for the information sir
Flashlight by the bed - ditto. Uncle Sam is kindly disposing of a lot of MEP-1040 10 KW Diesel generators. I got a very nice one with only six hours on the meter.
Lots of trees around the lines, and I'm the last house on the line - the next house over feeds from another area of the grid. I have battery backup systems that run everything that's critical to avoid downtime on (I WFH and the internet can take 15+ minutes to restart), then a standby generator with 7 days of fuel that takes 44 seconds to start transfer load from the mains. I have an additional portable generator that can run critical circuits to allow maintenance of the main generator during extended outages, and the biggest battery backup system is two redundant systems with redundant feeds to the load, so that I can perform maintenance on it without losing protection.
Oh, and I also have spike suppression in the breaker box, and the transfer switch detects floating neutral conditions and cuts grid power should that occur, either from wiring issues or something like a solar storm.
Ryan makes extension cords interesting!
Backup lighting at home primarily consists of candles and oil lamps/lanterns as well as a flashlight for more focused light. The most recent oil lamp I bought had a wall mount.
No never have a bad day. Those biscuits are never live until cables are rigged and space is in manned if flooding. They are used for power continuation. The covers are usually vinyl to be easily dusted and clean inside connectors. They are rigged by direction of DC central to repair locker leader to on scene electrician . Never energized without Chief Engineer's permission.
Unmanned if flooding sorry.
looking directly into the camera lens for a few seconds at a time makes the viewers feel like your speaking directly to us. No hate, I love your vids 👍🏼
Great video. I've been wondering what those things were for.
That is a very clever system. Both tactile and visual. Simple and easy.
"Bypass the EPS relays!" I always wondered what the real-world equivalent of that was.
When I was going to Engineering school after boot camp in the early 80s we learned about this but my Newport class LST (built during Vietnam) didn't have the system.
My home is at the end of the line, on a side street off of another side street. Power goes out often enough that I have a dual fuel generator and store enough propane at home to run it for a couple of days. (propane, unlike gasoline, does not go stale in storage) Also enough extension cords to run in through a window and power critical loads. The furnace, heating fans, fridge, the telephone and wifi, my mom's stairlift and oxygen concentrator, a few LED lights and charger for my laptop and cell phones. I also have a portable butane stove so I can heat food and make tea. Enough heat and serve food for several days in the kitchen cabinets anyway. the stairs also have several of those little LED motion detector battery lights, which are great to have at night to keep from tripping.
We have flashlights, lanterns, candles, some solar power bricks for recharging USB devices such as cell phones, and a small generator which we can use to keep the frig alive for a time.
As with so many things still in use these are ingenious solutions to critical situations , learned in wars . To a large extent they ensure critical equipment needed for the ships survival can be restored if possible . The leads are super flexible cable to make it more practical and part of many damage control exercises . Like other Naval basics , they are still in use , practically unchanged , on many ships today because they work . I've got a couple of torches & candles at home , but have a few solar garden lights I keep on a window sill which can be useful . I'm thinking solar will , or even may already be , a part of warship design for power .
ideally, I would have street power from the power company, as well as solar, and backup generator all fed through a battery backup. But because that all costs lots of money, I have candles.
I hear ya, but I have slight upgrade. I have scented and citronella candles 👍
Here I have some plus few oil lamps
I appreciate how all systems in the warship can be rerouted with switches, valve, patches and people, to ensure deep redundancy multiples. From flood spaces, power, gunnery and command systems, you need to destroy many many locations to kill this ship. I didn't realize how deep that went.
It would be fascinating to see a wiring schematic used in quickly planning casualty power routing.
These things have no schematics other than where sailor run the emergency cables . Each simply bypasses a bulkhead to an identical one on the other side . Someone needs to improvise a route and pass out commands to the sailors pulling the ropes .
Those black discs are for emergency power connections when battle damage severes a main cable. They are keyed on the disc for proper phasing of the feed. One, two, or three pips, and corresponding keying on the cables. Every thing you need in smoke and dark. You might see the biscuits connected to a power panel. Remember to wire from load to source.
Thanks, I did not get that from the video that spends allmost six minutes explaining it in great detail.
LOl! You just repeated what the video said! Duh!
"Load to source" or there will be more death.
@Not Sure Good thing that it's split into 3 phases
@@DonnyHooterHoot I was typing even before he started speaking. He said that this video is a redo of a previous video.
I'm assuming that nothing gets energized until all the connections are made?
three size port also. you cant plug a red or black into a white plug or a blck into a red plug. triple saftey besides color and hand feel markers
Love your videos, I need to come visit the ship. I have an automatic standby genset because PECO doesn't seem able to keep the power running way out on the MainLine.
Good stuff, thank you Ryan!
You're telling me that the sci-fi cliche of "rerouting power" is a real thing from 20th century battleships? That's awesome.
Kinda funny that directly over Ryan's left shoulder @0:09 is a modern "AED" sign. Yeah, but I don't think 400 volt 3 phase counts as an Automatic Emergency Defibrillator (AED) for anyone but Frankenstein!😄
Neat-o!!! Thanks for sharing, I really enjoy your videos!
Each pie slice has three holes. Are they all connected together, or is the hole choice significant? If you plug into red-1, do black and white also have to be the -1 hole? Do the connections on the other side of the biscuit in the other compartment have to use the same hole?
I am sure that one of two things is true. either each set of holes are interconnected, meaning that it doesn't matter which red (or black or white) you plug into, the guy on the other side can plug into any of the. Or there is a set order for filling the holes to make sure everything hooks up correctly.
However, I would put money on the three holes of each color and on each side of the wall being electrically connected simply because it simplifies EVERYTHING. It lets one puck supply power to three other pucks in the same space by just running cables to each. It lets you connect up ALL of the pucks in a particular space by making a loop. AND it makes it really easy to instruct the new guy, "plug black in black, white in white, and red in red. No, it doesn't matter which hole you use"
@@gildedbear5355 Yeah, that makes sense, especially considering how much effort they put into making it simple. Thanks.
Okay. Here's what's always been one of my big questions about ships, especially with twin rudders, and especially still the iowa-class. Why are the rudders so small compared to the rest of the ship, and wouldn't bigger rudders be more effective and result in a tighter turning circle?
Also why are such little rudders so powerful?
the larger the rudder, the more drag it would create (slowing the ship down even more during turns) and also the more power it would require to physically turn the rudder.
There are two factors that make the rudders "seem" small.
When maneuvering at *high speed* , the flow of water provides the rudder with more authority. Thus a smaller rudder is all you need. A rudder large enough to give tight turns at *LOW* speed would create lots of drag, and would be in danger of been ripped off if deflected at high speed.
For this reason your sailships seem to have a "larger" rudder, they do not get to 28 knots😊
Another reason why rudders seem "smallish" is that we have a poor grasp of how powerful and how dense water is. We are used to seeing wings and rudders on airplanes, and they seem huge. Because the air is so much less dense.
For a reality check: compare the rudder of a deHavilland Beaver on floats, with the two pitiful tabs at the rear of the floats used to steer it in the water. Density changes the scale of things. 👍
I'm an electrician at an airport.
We use our own Natural Gas powered gen sets for power generation, and have the grid as a back-up.
A fascinating video, thank you. However, I would have though having a single three pin plug would be preferable to having separate conductors where current could be fed back from the conductor already connected to the other two via what the other end was connected to. Just a thought.
Fantastic ! Thanks Ryan.
much nicer belt! keep up the great work!
We have several backups at home, even being pretty close to the city. First up are automatic emergency lights on each level that go automatically on when outlet power is lost (First Alert makes some very small, very nice ones now). These are rechargeable, and can be unplugged to use as emergency flashlights. Next are multiple LED flashlights, with spare batteries. For computers, we have two laptops good for a couple of hours each, plus a full UPS on the biggest system that can power everything plenty long enough for a safe shutdown. Then, since we have an attached garage, we have an emergency inverter for each car, allowing up to 1400 Watts via extension cords. Each of the cars also have chargers for cellphones, etc. And those cellphones have hot spot settings, so we can still connect to internet on an emergency basis. We also have a pair of weather alert radios.
All told, we are likely good for a day or two, without any outside assistance. (I was an engineer for a TV station for a dozen years, and an engineer for medical facilities for over two decades, so having redundant backup plans and systems is not anything new.) As it happens, we lost power for four hours last Saturday, and were not even inconvenienced. We could even watch movies on video until the power company got a crew out to our neighborhood.
All good things!
I have Amish neighbors so I have learned to appreciate the dark 😉
Interesting topic. They sure had their ship together when they built those vessels.
I have 100W solar with 12v backup batteries for 4 ceiling outlets in the house @12v.
And I have full house solar with batts.
We have battery powered emergency lights which replaced our normal LED lighrs. They go off and on with the switch somwe can extend the run time quite a bit. We also have a pair of Honda geneeators to run imporrant things in the house. Our longest outage somhar has been four days
That's so cool!!! I learned something new today!!!!
My flashlight is on the kitchen junk drawer where I can't find it if the power goes out.
Awesome video! Could you do a video of the different colored pipes around the ship?
Great idea! I'll add it to our list.
In computer networking we still call a surface mount box for wiring (even a small plastic one) a biscuit. I'm guessing this is where the name came from.
So the biscuits are whenever power has to pass through a bulkhead or at a source or power or something that would be supplied with power? The original video admittedly left me confused on why/how they used the cables and biscuits but seeing the different types of biscuit it makes sense now. Thanks.
I keep 3000 hamsters in case of a power outage; they work in three four hour shifts.
I'm guessing that the holes are aligned, as well. That is, going clockwise, if the black goes in the first black, then the white goes in the first white and the red goes in the first red, same for it it's going into the second black/white/red, and so on.
Outtages are pretty rare where I live, and the few ones we have don't last long. High voltage lines which aren't below ground run in corridors which are kept tree-free; anything else runs below ground. So, no redundancy here.
for when you have to unplug and plug back in your battleship
I have this really cool torch that turns on when the power goes out. It makes it extremely easy to find in the dark, and it's always charged.
I work in engineering at a regional hospital, we have redundant electrical systems. Never seen bricks like this and I found interesting. In a hospital environment we practice and plan for power and facilities lose. At my facility we have 5 generators (3 supplies 1150VAc and 2 supply 480VAC). We are fortunate all our power are control by building automation and with consideration to load we can for most part go completely offline from power company and supply 100%. In front of power generators we have several UPS battery backup that support critical and life support systems and IT services. In front of those system all critical and life support systems have their own UPS and most have individual battery back up.
Lots of redundant systems, that all require monthly, quarterly, semi Annual, annual and 5 year inspection that is documented.