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Post by silverdragon on Apr 15, 2017 5:53:45 GMT
You can't put the engines of comercial passenger jets in reverse during flight. Back in 1991 there was a crash caused when the engines on an aircraft went into reverse during takeoff. Since then it has been mandatory for multiple safeguards to be in place to prevent the engines going into reverse unless its on the ground. I wonder how many safeguards there are against turning off the engines on a Huey and letting it "Fall" to terminal velocity?.
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Post by silverdragon on Apr 15, 2017 5:59:15 GMT
and I still say you are comparing apples and boat anchors. the airbus cannot decelerate rapidly, because they don't want to jostle the passengers. but beyond that you are looking at completely different acceleration profiles. the airbus is reducing speed in normal flight, while the helicopter is recovering from freefall. even a harrier performing a "handbrake" is a different sort of critter. the only real comparisons one could do is of a helicopter and a harrier doing a maximum vertical takeoff, because you're not going to talk anybody into letting you stand their airbus on its tail and try to do a vertical takeoff. Thats a good point. However, chasing down a falling capsule, I say you have more chance catching one in a fast jet than a belly down dropping chopper. For a start, can that even feather its rotors to stop them spinning, and if not, the auto-gyro effect of spinning blades wont let it drop that fast. I would suggest that if you did an engine off, the chopper would try to restart that way anyway?.
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Post by the light works on Apr 15, 2017 7:07:03 GMT
and I still say you are comparing apples and boat anchors. the airbus cannot decelerate rapidly, because they don't want to jostle the passengers. but beyond that you are looking at completely different acceleration profiles. the airbus is reducing speed in normal flight, while the helicopter is recovering from freefall. even a harrier performing a "handbrake" is a different sort of critter. the only real comparisons one could do is of a helicopter and a harrier doing a maximum vertical takeoff, because you're not going to talk anybody into letting you stand their airbus on its tail and try to do a vertical takeoff. Thats a good point. However, chasing down a falling capsule, I say you have more chance catching one in a fast jet than a belly down dropping chopper. For a start, can that even feather its rotors to stop them spinning, and if not, the auto-gyro effect of spinning blades wont let it drop that fast. I would suggest that if you did an engine off, the chopper would try to restart that way anyway?. no, I have no reason to believe helicopters have a brake on the rotors. I know a piston engine chopper can drag the blades to a stop - this from a pilot pointing out if you lose the engine, you have to be quick on the blade clutch if you want to autorotate. but don't forget the terminal velocity of the capsule was said in the show to be 129 MPH.
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Post by silverdragon on Apr 16, 2017 10:24:46 GMT
Thats a good point. However, chasing down a falling capsule, I say you have more chance catching one in a fast jet than a belly down dropping chopper. For a start, can that even feather its rotors to stop them spinning, and if not, the auto-gyro effect of spinning blades wont let it drop that fast. I would suggest that if you did an engine off, the chopper would try to restart that way anyway?. no, I have no reason to believe helicopters have a brake on the rotors. I know a piston engine chopper can drag the blades to a stop - this from a pilot pointing out if you lose the engine, you have to be quick on the blade clutch if you want to autorotate. but don't forget the terminal velocity of the capsule was said in the show to be 129 MPH.129mph... I call B/S on that?.. Can "Someone" tell me the actual figures here, but 129mph sounds bloody slow to be entering earths atmosphere?. Yeah, I know, the capsules that return astronauts have to land a lot slower than that unless you want astronaut jam, but there has been no mention of parachutes on that capsule as to how the hell it slowed down from thousands of miles per hour to 129... And if it could slow down from that speed to 129, why not further, and land much slower?. Its a capsule, "Terminal velocity" has no sensible place here, it has a heat shield and aerodynamics that sort of control its fall speed through the atmosphere. Going out on a limb here, but knowing the speed of the chase planes that escorted the Shuttle down, I am estimating that the space shuttle landed at faster speeds than that anyway?.. [..A quick search shows 190 to 200 knots horizontally onto the runway , and falling at 6ft per second on the glide path. so its no slouch.] This saying, 129mph before any parachute is deployed is bloody slow, and therefore, I call it as Bunkum?.
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Post by the light works on Apr 16, 2017 14:04:09 GMT
no, I have no reason to believe helicopters have a brake on the rotors. I know a piston engine chopper can drag the blades to a stop - this from a pilot pointing out if you lose the engine, you have to be quick on the blade clutch if you want to autorotate. but don't forget the terminal velocity of the capsule was said in the show to be 129 MPH.129mph... I call B/S on that?.. Can "Someone" tell me the actual figures here, but 129mph sounds bloody slow to be entering earths atmosphere?. Yeah, I know, the capsules that return astronauts have to land a lot slower than that unless you want astronaut jam, but there has been no mention of parachutes on that capsule as to how the hell it slowed down from thousands of miles per hour to 129... And if it could slow down from that speed to 129, why not further, and land much slower?. Its a capsule, "Terminal velocity" has no sensible place here, it has a heat shield and aerodynamics that sort of control its fall speed through the atmosphere. Going out on a limb here, but knowing the speed of the chase planes that escorted the Shuttle down, I am estimating that the space shuttle landed at faster speeds than that anyway?.. [..A quick search shows 190 to 200 knots horizontally onto the runway , and falling at 6ft per second on the glide path. so its no slouch.] This saying, 129mph before any parachute is deployed is bloody slow, and therefore, I call it as Bunkum?. you did catch back when I first started watching it and referred to it as an unintentional comedy, didn't you?
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Post by Cybermortis on Apr 16, 2017 16:55:00 GMT
I also call bs on that speed; That's easily within the terminal velocity of a skydiver.
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Post by silverdragon on Apr 17, 2017 5:55:42 GMT
I also call bs on that speed; That's easily within the terminal velocity of a skydiver. I have an immediate mental picture of Blondie chasing down the capsule head down hammer first grabbing it with a cuddle and using his cape as a parachute.... I think I need a strong drink now?.
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Post by silverdragon on Apr 18, 2017 7:13:32 GMT
I also call bs on that speed; That's easily within the terminal velocity of a skydiver. I have an immediate mental picture of Blondie chasing down the capsule head down hammer first grabbing it with a cuddle and using his cape as a parachute.... I think I need a strong drink now?. Had the strong drink, the image wont shift?.. any recommendations?.
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Post by Lokifan on Apr 18, 2017 7:32:26 GMT
New episode tonight! Spoilers ahead...
To tell the truth, this one was a bit more fishy than usual.
The team is hired to repair the power system of a biodome-like research project in the desert. Naturally, things go wrong.
1. A large pile of potting soil blocks the doorway between two compartments. In order to remove it quickly, our heroes stuff it with pure ammonium nitrate, then soak it with water, causing it to freeze. They then could removed the now frozen soil by chopping it into blocks that could be handled more easily.
2. Can you melt an aluminum "No Trespassing" sign with a BBQ lighter, and use it to seal a leaking tank of human waste?
3. Can you use a large piston connected to a rare earth magnet, driven with an electrical current, to make an injection system to force saline into someone's arm?
4. Can you protect yourself from ammonia gas poisoning by using the paper mache head of a large pinata as a helmet?
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Post by silverdragon on Apr 18, 2017 8:22:17 GMT
More fishy than a fish that just got promoted to a big fish perhaps mr Black-Bladder?..
There is a reason why a shovel is "So big"... its because thats just about the right size to handle the weight of a shovel FULL of earth.. for easy handling... and its length give you a perfect lever to chuck the soil many feet?.. Why not just use a bloody shovel?. That sound like making a mountain out of a mole hill, and almost exactly the same?..
In Truth, you ever tried digging frozen soil?.. its as solid as a block of ice, being it contains water, and unless your using a chain-saw, even a back-hoe would have problems. Which is why they use a smaller bucket in Winter, more force on a smaller area...
As most BBQ Lighter "wind guards" are made of aluminium, I am guessing perhaps no?.. The heat from a BBQ lighter is about the same heat as a normal stove at its best, and I have large 5 ltre aluminium pans for use on my stove, for the bigger stuff my smaller steel ones are to small for, and they have never melted yet. I also have Oven pans of aluminium, and the gas mark on the hottest oven from natural gas doesnt melt them.
I would guess your going to need oxyacetylene torch to blow oxygen in to get the heat that melts aluminium, I know someone who has a small forge thing that melts Alu, and its not a barbecue lighter I can tell you that.
Whats wrong with just using the supplied medical equipment for such things... Also, doing so "By force" could kill someone, especially if you force bubbles into the blood stream. This is why they use a gentle force oh a hypodermic needle?.. or did I miss that part of First Aid training ?.. Also thinning out the blood that quickly, in such a large lump of just saline, when that hits important parts of the blood stream that need oxygen from normal blood supply, like the heart, you going to starve them of oxygen, and cause damage. I aint no Paramedic, but I do know that adding fluids to the blood supply, unless its oxygenated blood its self, has to be done by a drip-feed... slowly, and with great care...
If its being done slowly, an elevated drip feed bag is all you need, gravity does the rest?.
Yes, as long as you seal up any gaps and put a proper gas mask filter on it. Otherwise, breath through that paper?.. good luck, if they used the right glue, its almost air-tight?..[unless you use forces air that is...] If they didnt use the right glue, its going to fall apart pretty quick.
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Post by Cybermortis on Apr 18, 2017 8:22:38 GMT
1; Actually plausible, as ammonium nitrate mixed with water is an endothermic reaction. Not sure if the reaction would actually get that cold however, regardless of the purity of the chemicals.
2; Actually theoretically plausible. Melting point of Aluminium is some 660C/1200F and under ideal conditions even a standard butane lighter can burn almost twice that. Even under less than ideal conditions a standard lighter could in theory kick out enough heat to melt aluminium.
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Post by silverdragon on Apr 18, 2017 8:30:02 GMT
Extra. When "welding" aluminium, this I know, its bloody tricky, because the Alu is a good heat sink, and you have to get the flow "just right" to make the two parts stick together. That beyond my skill set, I can gas-weld and Tig- and Mig-weld Steel, not perfect but just enough to make them stick, Aluminium is very hard to do. I have not done that yet to anything worth saying I did it?.. And on a tank... the idea is you empty the tank first, otherwise the fluids inside are going to sink-away all heat, and thus your weld is not going to stick.
I do know its temperature sensitive...VERY sensitive.. special snowflake on attack mode sort of sensitive.. .. something like 10 degree below, non-stick. then the same 10degree above, it all melts away like water. The art is getting the two parts at the same temp and allowing them to "Fuse", and when they fuse, they generally fuse to a level that is stronger than the surrounding material?. Its a case of all-or-nothing.
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Post by silverdragon on Apr 18, 2017 8:33:08 GMT
1; Actually plausible, as ammonium nitrate mixed with water is an endothermic reaction. Not sure if the reaction would actually get that cold however, regardless of the purity of the chemicals. 2; Actually theoretically plausible. Melting point of Aluminium is some 660C/1200F and under ideal conditions even a standard butane lighter can burn almost twice that. Even under less than ideal conditions a standard lighter could in theory kick out enough heat to melt aluminium. 1] yes, but in saying that, wouldnt it be far faster and easier to just use a bloody shovel??. after all, thats what they are designed for?... 2] but a sign is a bloody big heat sink... that heat will dicipate rather quick?.. If it were small chopped up pieces inside a crucible, maybe yes with enough time, but just using a big piece of metal and trying to weld it?..
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Post by the light works on Apr 18, 2017 14:10:10 GMT
New episode tonight! Spoilers ahead... To tell the truth, this one was a bit more fishy than usual. The team is hired to repair the power system of a biodome-like research project in the desert. Naturally, things go wrong. 1. A large pile of potting soil blocks the doorway between two compartments. In order to remove it quickly, our heroes stuff it with pure ammonium nitrate, then soak it with water, causing it to freeze. They then could removed the now frozen soil by chopping it into blocks that could be handled more easily. 2. Can you melt an aluminum "No Trespassing" sign with a BBQ lighter, and use it to seal a leaking tank of human waste? 3. Can you use a large piston connected to a rare earth magnet, driven with an electrical current, to make an injection system to force saline into someone's arm? 4. Can you protect yourself from ammonia gas poisoning by using the paper mache head of a large pinata as a helmet? 1: can we say pycrete, boys and girls? 2: naturally aspirated fire CAN cause lightweight metal to melt and run. however, aluminum is a poor candidate - though an aluminum sign may be just enough of "random light metal" to get useful liquid metal from. that still doesn't address that a standard BBQ lighter flame does not produce all that many BTUs and so may not be capable of heating any significant mass of metal to working temperature. the key question is whether they are welding a seal on the tank, or doing a solder/hot glue patch. it takes a lot of focused heat to weld a filled tank. - an to compare experiences, I've used a "spoolermatic" to weld aluminum in the classroom, and it actually makes it pretty much worry-free. 3: piston, rare earth magnet, electrical current. is there a coil, somewhere in there? as far as force-loading saline, if you have the usual IV apparatus, a blood pressure cuff makes a great booster pump, and sometimes, yes, you want to get fluids in that quick. since you're dumping it into a vein, it gets cycled through the heart and lungs and diluted with blood before it is asked to deliver anything, so you can get away with it. 4: I'm seeing a mental image of a lot of not-air-tightness in that description. not-air-tightness is bad when you have airborne ammonia.
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Post by Cybermortis on Apr 18, 2017 17:04:29 GMT
Oh, I agree fully with that. I'm just curious to know if the technique used could actually freeze soil as described.
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Post by Lokifan on Apr 18, 2017 18:00:25 GMT
Oh, I agree fully with that. I'm just curious to know if the technique used could actually freeze soil as described. Yeah, about that technique- Using what looked like an entrenching tool to shove aluminun nitrate a few inches into the pile from one side, while flooding the opposite side of the pile? Once frozen, you then chop up the pile, which shatters into rubble from brick sized up to a cube about a foot in diameter, which can be lifted to one side easily. Hmmm...kinda looked like painted styrofoam... The whole pile seems frozen hard enough (in moments) to be able to dig a tunnel through to the other side without it collapsing. Fishy? Holy mackerel, yes. My guess is it looked good on paper, so they went with it.
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Post by the light works on Apr 19, 2017 4:22:38 GMT
Oh, I agree fully with that. I'm just curious to know if the technique used could actually freeze soil as described. that looked an awful lot like a bag of fertilizer. they used; and I've never seen my soil freeze when the sprinklers are running. also, they had shovels - albeit tiny ones, and were using VERY poor technique. - also the ambient temperature while they were doing this was in excess of 100 degrees F.
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Post by the light works on Apr 19, 2017 4:33:09 GMT
Oh, I agree fully with that. I'm just curious to know if the technique used could actually freeze soil as described. Yeah, about that technique- Using what looked like an entrenching tool to shove aluminun nitrate a few inches into the pile from one side, while flooding the opposite side of the pile? Once frozen, you then chop up the pile, which shatters into rubble from brick sized up to a cube about a foot in diameter, which can be lifted to one side easily. Hmmm...kinda looked like painted styrofoam... The whole pile seems frozen hard enough (in moments) to be able to dig a tunnel through to the other side without it collapsing. Fishy? Holy mackerel, yes. My guess is it looked good on paper, so they went with it. ammonium nitrate, not aluminum nitrate. you know, the stuff they use when they don't want to take the respiratory precautions they have to take with anhydrous ammonia. it's a very common fertilizer. feel free to buy a box or bag and mix it with water. oh, and by the way, it's also the stuff they make ANFO out of, and the stuff that nearly knocked the town of West, Texas off the map. and in short, THAT is what they should have used to make the explosive paste they blew the hinges off the door with. WISER listed a slew of things you can mix with it that make it catch fire or explode. if you dare to fight an ammonium nitrate fire, set an unmanned nozzle to flood it with water and leave the area until the fire either goes out, or goes boom.
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Post by the light works on Apr 19, 2017 4:37:07 GMT
more information on #2: they didn't just use the lighter, they used cans of aerosol air freshener to increase the heat output. they also appeared to be essentially capping the leak instead of welding it up.
since the sewage tank was venting ammonia gas, they were using the pinata heads as helmets - lensing the eyes, and sealing around their necks with clear packing tape. - of course, they had to be quick about it, because they were generating carbon monoxide inside the heads.
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Post by the light works on Apr 19, 2017 4:39:05 GMT
#3: the piston was used to create a "bones McCoy" needleless injection system which delivered homemade saline into the fatty tissue of the patient. - sufficient to relieve severe dehydration in seconds.
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