Yet Another Cycling Forum
General Category => Freewheeling => Topic started by: Paul on 25 June, 2017, 12:11:21 am
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...you can fix a car, or a helicopter, or a giant gun.
And don't worry too much about how well you can fix a bicycle,
(https://vimeo.com/84118664)
because what's 45 degrees when you're really just cannon fodder.
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I wonder what's the giant gun equivalent of fitting new cranks at 90 degrees to each other and not noticing until you've torqued down the crank bolts, trapping a new tube under the tyre bead or putting SRAM axle nuts on a Brompton with a Sturmey Archer hub (subtle but really bad)?
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I wonder if anyone has pointed the poorly fitted cranks out to the Royal Navy?
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I wonder what's the giant gun equivalent of fitting new cranks at 90 degrees to each other and not noticing until you've torqued down the crank bolts, trapping a new tube under the tyre bead or putting SRAM axle nuts on a Brompton with a Sturmey Archer hub (subtle but really bad)?
Admiral?
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That's nothing compared to what will happen if he turns a destroyer upside down to fix it.
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He probably went on to aiming Trident missiles with that knowledge of angles.
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I wonder what's the giant gun equivalent of fitting new cranks at 90 degrees to each other and not noticing until you've torqued down the crank bolts, trapping a new tube under the tyre bead or putting SRAM axle nuts on a Brompton with a Sturmey Archer hub (subtle but really bad)?
Seeing as the Royal navy got rid of its big gun battleships shortly after WW2, we'll have to defer to the US Navy for big gun FUBARs.
An investigation into New Jersey's gunfire effectiveness in Lebanon, led by Marine Colonel Don Price, found that many of the ship's shells had missed their targets by as much as 10,000 yards (9,140 m) and therefore may have inadvertently killed civilians. Tim McNulty, a correspondent for the Chicago Tribune based in Lebanon said, "Everybody loved the New Jersey until she fired her guns. Once she fired, it was obvious she couldn't hit anything."[39][40] The inaccuracy is believed to have resulted because the ship's main gunpowder had been remixed by the Navy, under the direction of Captain Joseph Dominick Miceli at the Naval Weapons Support Center, and rebagged. Powder lots (an individual production of powder) burn at different rates. Therefore, remixing the powder lots could cause the guns to fire inconsistently. The problem was apparently resolved after the Navy was able to locate additional powder supplies which had not been remixed.[41]
https://en.wikipedia.org/wiki/USS_New_Jersey_(BB-62)#Lebanese_Civil_War_.281983.E2.80.931984.29
Then there is the premature detonation in the No. 2 turret on USS Iowa, caused by the bagged charges being rammed into the breech too fast:
The rammerman's position was of special concern, as ramming was considered the most dangerous part of loading the gun. The ram was used to first thrust the projectile and then the powder bags into the gun's breech. The ram speed used for the projectile was much faster (14 feet (4.3 m) per second) than that used for the lighter powder bags (1.5 feet (0.46 m) per second), but there was no safety device on the ram piston to prevent the rammerman from accidentally pushing the powder bags at the faster speed. Overramming the powder bags into the gun could subject the highly flammable powder to excessive friction and compression, with a resulting increased danger of premature combustion.
https://en.wikipedia.org/wiki/USS_Iowa_turret_explosion#Preparation_for_fleet_exercise
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The fate of the German U-boat U-1206 springs to mind as well, where failure to operate a toilet properly while sneaking around the Scottish coast led to flooding of the boat and a forced surface, upon which it was quickly spotted by the Royal Navy, bombed and scuttled.
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I wonder what's the giant gun equivalent of fitting new cranks at 90 degrees to each other and not noticing until you've torqued down the crank bolts, trapping a new tube under the tyre bead or putting SRAM axle nuts on a Brompton with a Sturmey Archer hub (subtle but really bad)?
Friendly fire?
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The fate of the German U-boat U-1206 springs to mind as well, where failure to operate a toilet properly while sneaking around the Scottish coast led to flooding of the boat and a forced surface, upon which it was quickly spotted by the Royal Navy, bombed and scuttled.
The amount of water ingress wasn't the problem, it was the chemical reaction with the batteries in a live circuit, producing loads of chlorine gas.
The U-boat's Captain was one letter away from being nominatively determinative. :D
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To be fair, submarine toilets aren't quite as simple as pulling a chain and giving the room a quick blast of Febreze:
(http://4.bp.blogspot.com/-R3gRYfJJjA0/UiNcBURsswI/AAAAAAAAWOw/vOzgVSC3XQI/s640/submarine+toilet+operating+instructions+1-8.jpg)
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Yeah, those things have nearly as many unpleasant failure modes as a Saniflo...
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My sister once opened a camping toilet (chemical) at the top of an Austrian mountain. It had last been used in Holland.
"It just exploded!"
Cue much cleaning of blue stuff inside a caravan
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My sister once opened a camping toilet (chemical) at the top of an Austrian mountain. It had last been used in Holland.
"It just exploded!"
Cue much cleaning of blue stuff inside a caravan
It should have imploded.
Methane from sewage - nothing to do with going from holland to top of mountain.
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Why imploded?
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Oh I am being dumb, sorry.
It is a long day after a succession of long days.
Still think that it was more likely the methane, the pressure change from altitude would have been little more than a 'poof', not a 'spoooolfph'.
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Er, my phys chemical is very weak but....does the methane and other noxious volatiles not reach saturation at sea level. at the top, on releasing the pressure they suddenly 'boil' (wassa word, told you) out.
I've done this with a Thetford that had a faulty pressure release, and it does leap at you :sick: I've also also created super saturated solutions accidently.
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Oh I am being dumb, sorry.
It is a long day after a succession of long days.
Still think that it was more likely the methane, the pressure change from altitude would have been little more than a 'poof', not a 'spoooolfph'.
It was a definite sploooofph. Quite an appreciable pressure change. Luckily no fermenting matter at that stage of the holiday, but there may have been some contribution just from saturation of air at sea level.
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That's nothing compared to what will happen if he turns a destroyer upside down to fix it.
You should never, ever do that to your faithful bicycle. Rubber side down, all the time. No exception.
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Er, my phys chemical is very weak but....does the methane and other noxious volatiles not reach saturation at sea level. at the top, on releasing the pressure they suddenly 'boil' (wassa word, told you) out.
I've done this with a Thetford that had a faulty pressure release, and it does leap at you :sick: I've also also created super saturated solutions accidently.
sublimate?
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You should never, ever do that to your faithful bicycle. Rubber side down, all the time. No exception.
Let's not debate that here. I'm inclined to agree, but at least your bike doesn't sink gently into the tarmac if you do.
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You should never, ever do that to your faithful bicycle. Rubber side down, all the time. No exception.
Let's not debate that here. I'm inclined to agree, but at least your bike doesn't sink gently into the tarmac if you do.
We've got a thread for that already: https://yacf.co.uk/forum/index.php?topic=102686.0
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We've got a thread for that already: https://yacf.co.uk/forum/index.php?topic=102686.0
I missed that one. Thank you!
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Er, my phys chemical is very weak but....does the methane and other noxious volatiles not reach saturation at sea level. at the top, on releasing the pressure they suddenly 'boil' (wassa word, told you) out.
I've done this with a Thetford that had a faulty pressure release, and it does leap at you :sick: I've also also created super saturated solutions accidently.
sublimate?
No, that's solid to gas, I think it might be bump
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That's just what I woke up thinking! (About sublimate; I don't know about bump.)
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In oil and gas drilling terms it would be a "kick" as the dissolved gas comes out of solution as the pressure is lowered up the drill string, and becomes an ever expanding ever accelerating bubble of gas.
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I guess that's the sort of error that may have enabled a container ship to take out one of the US Navy's finest warships.
What's more, if anyone needs to have another go this could be useful information to have:
Preliminary analysis indicates the collision occurred where the ship’s communication nodes are housed and the official said the crew had to resort to using satellite based cell phones to communicate both on board and back to shore.
Lucky they hadn't forgotten to keep the batteries charged.
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Depending on the, er, violence of the toilet explosion, it might count as a BLEVE of sorts?
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because what's 45 degrees when you're really just cannon fodder.
I had cranks at 135 degrees one time, at least as far as offering the crank up to the BB axle.
My LH TA Zephyr crank had broken at the pedal threads, so I rang up the shop (Spa, iirc) for a new one. "Out of production," they said "we don't have any". On discussion, the closest equivalent was a Carmina crank, so I ordered one.
You'd have thought that the same manufacturer would make the square taper the same way round on the replacement model, but no.
At least I hadn't put the crank bolt in, so it was good to go back.
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Depending on the, er, violence of the toilet explosion, it might count as a BLEVE of sorts?
I hope no combustion was involved :o
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Yeah, those things have nearly as many unpleasant failure modes as a Saniflo...
I spotted the talk of submarine toilets on this thread last week but was away from home and couldn’t face trying to write my contribution on the phone. So here it is now a week overdue.
For many decades now RN submarines have had two methods of emptying their waste tanks, pumping or blowing. Pumping is much preferred as blowing can be problematic in the following way:
Just over ten years ago while at sea on an unspecified (but now decommissioned) submarine we were having to regularly blow our waste tanks on account of a defective sewage pump.
So just as we had done for several nights before we lined up to ‘blow doms’. This involved shutting off every valve connecting a waste pipe to the domestic tanks before pressurising the tanks above sea pressure and opening the sewage hull valve.
On is occasion things didn’t go as planned. As the sewage tank came up to pressure an isolating valve connected to the heads (navy speak for toilets) on 1 deck just off the Control Room failed. The result was a spectacular shit fountain as the sewage tank emptied itself through the head.
Very quickly the Control Room filled up with sewage, I was sat at a fire control desk with a torpedo tube bow cap open, I couldn’t stand down from this position until the bow cap was shut. All I could do was lift my legs as the jobbies floated past.
As the sewage started flowing into the Wardroom the XO (second in command) came in and ordered a bow up (angle of the boat), this sent the sewage into the CO’s Cabin so he countered be ordering a bow down. All of this continued until the Chief Stoker appeared, launched himself into the fountain and isolated the head.
Anyway by this time the stuff had gotten everywhere, down the periscope mast wells, down pipe conduits, into the galley and messes below on 2 deck. Needless to say we went alongside for a good clean up.