NASA has performed a nearly 9 minute long test of the engine called RS-25 which will be used for next generation mega-rockets which will take the astronauts to Mars & other deep space missions.
The agency successfully tested an RS-25 engine at Stennis Space Center in Mississippi. A total of four RS-25 engines will be used to power the SLS rocket (Space Launch System).
The engine was tested for 535 seconds, which is the same amount of time the engines will fire uring actual SLS launch.
The test was the sixth of seven planned hot-fire trials for the RS-25, which also served as the main engine for NASA’s now-retired space shuttle fleet, ‘Space.com’ reported. The seven-test series is “designed to put the upgraded former space shuttle main engines through the rigorous temperature and pressure conditions they will experience during a launch,” NASA officials said.
“The tests also support the development of a new controller, or ‘brain,’for the engine, which monitors engine status and communicates between the vehicle and the engine, relaying commands to the engine and transmitting data back to the vehicle,”
the officials added.
Watch the miraculous masterpiece of mechanical, thermal & cryogenic engineering in action !
The raging RS-25 – (must watch; feel the power)
It’s big… no it’s bigger… sorry it’s the BIGGEST truck in the world !
Whenever I see it, it gives me a feeling like the truck is trying to say me – GET THE HELL OUT OF MY WAY !!!
You probably enjoyed the childhood by making the construction scenes, playing with the trucks making sounds – Vroom broom…! Our favorite among the collection of toys were the backhoe loader(well known as JCB) & the dump truck because they were different from others. We love to fill the bed with mud, rocks & made mechanical voices while dumping it.
In real world dump trucks are used to haul loads of rocks, dirt, sand, coal etc. And obviously the more a dump truck can carry, the less it costs the mining company per load to haul the resources.
For several years the largest dump truck was the Caterpillar 797B.
This massive beast was so big that it couldn’t be driven even on a highway. Instead it had to be transported in pieces & assembled at the construction site. Unbelievable, isn’t it ?
But, human nature – “never satisfies”. So the title of largest dump truck went to a new vehicle – The mighty BelAZ 75710.
Now this thing is really really at the edge of massive-ness. It is manufactured by BelAZ in Belarus.
So how big is it ?
If u stand beside it, you would barely reach to the center of it’s tires or in a better way – the radius of tire is greater than your height ! Each tire costs $42,000 which also explains why this entire shit costs over $6 million !
It is as long as two buses parked end to end & believe me – it is more heavy than Airbus A380 – the world’s largest passenger airliner !
It is 20.6 metres long, 8.16 metres high, and 9.87 metres wide. The empty weight is 360 tons & it can carry 450 tons of load !
Instead of a single engine, the Siemens MMT 500 drive system is powered by two 65-litre 16-cylinder diesel engines, each with 2300 horsepower. 2 engines working together give a power of 4,600 hp – 4.6 times than the Bugatti Veyron Super Sport, the fastest car in the world !
Now, if you are wondering why BelAZ chose electric motors to drive this thing; the company wanted to maximise fuel efficiency while also meeting tougher environmental regulations that govern vehicle emissions related to mining operations.
Now this is the first time I have used the exclamation marks so frequently – almost after every line. Well it had to be done. Yea, you know it expresses the feelings !
So once more…
All hail mighty BelAZ 75710 !!!!!!!!!!!!!!!!!!!!!!!!!
Thinking or wanna walk on water ? – really bad idea. Why cant we walk on water ? Why does not everything float ? Why doesn’t a stone or any other thing float even if they are are very small ? & HOW DO SHIPS FLOAT BEING SO HEAVY ?
I bet everyone would have ask this question to themselves at least once in a lifetime. My grandfather – a septuagenarian also asked me this question. Well it feels good, even such aged people are interested !
The thing which is known to us is – if the material’s density is more than water then it would sink to the bottom. But then how the hell, the ships made from steel & iron(which are very much denser than water) float ?
So lets explore…
Archimedes principle :-
Archimedes – who ran naked on streets due to excitement saying “Eureka…Eureka..!“(which means – I have found it) the whole time when he found the solution for the problem he was given to solve by the king to check the purity of crown. The problem was solved with the concept of buoyancy.
The Archimedes principle states that,
The upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces.
Basically, when will the object float ? –
When the weight of a body or object is less than the weight of the fluid it displaces !!
According to Archimedes principle, if u take a cube of volume 10 cubic meter weighing 20 metric tons & just push it into a lake, a buoyant force of 10 metric tons will push the cube upwards. So,
How do ships float ?
Lets understand it in a better way in a form of example & story…
Assume we are gifted a cube, made of steel, weighing 20 metric tons & having a volume of 10 cubic meter.
Case A:- When the cube sinks.
We take the cube & toss it off into a sea nearby. What happened ? A big splash & cube straight to the bottom. Well our cube having weight 20 tons, displaced 10 cubic meter of water & an upward buoyant force of 10 tons; Archimedes principle. So we have 10 tons more weight pulling our cube down than the buoyant force pushing upwards & our cube sank. In other words, THE CUBE’S WEIGHT IS MORE THAN THE WEIGHT OF WATER IT DISPLACED !
Case B:- When the cube neither sinks nor floats.
Now take the same cube weighing 20 tons & make some changes in it’s design. This time it’s volume is 20 cubic meter. Now we toss our cube again having same weight but a different volume. Again a big splash & yea just near to the surface of water. It is inside the water but it doesn’t sink. This is also called neutral buoyancy.
Here, THE WEIGHT OF OUR CUBE IS EQUAL TO THE WEIGHT OF WATER IT DISPLACED.
But oops, it is of no use… so we pull it up again & continue our research.
Case C:- When it FLOATS.
This time, again improvising the design of cube & increasing it’s volume to 30 cubic meter keeping the weight 20 tons. Back to the sea with tons of excitement, we toss it again & what ? – IT FLOATS !
Congratulations, you just made a ship which doesn’t look like a ship. Butttt, what matters is – It floats. This time THE WEIGHT OF OUR CUBE IS LESS THAN TO THE WEIGHT OF WATER WHICH IT WILL DISPLACE.
Okayyy… so now it floats. But it will be partly submerged. So how far will it be submerged & how much part will it be above the water ? Well, our ship will get submerged until its weight equals the weight of water displaced. In this case, our ship’s 20 cubic meter of volume will be under water leaving 10 cubic meter above the water…
And done, here we go, keeping the weight same we made it float.
Now even if some people just get on-board on our ship, don’t worry ! Our ship will get more submerged into water, but HELL YEAH… it still floats & that becomes a Cruise ship; add cargo on it & it becomes a Cargo ship.
Now if u still wanna walk on water, you know what to do, just increase your volume by maintaining the same weight. Now how to that – it’s your problem ! 😛
The first thing which comes into my mind – A must do prank ! 😛
A Pythagorean Cup OR a Greedy Cupis a form of a drinking cup which forces its user to consume less alcohol. It allows the user to fill the cup with wine, alcohol or any other liquid up to a certain level. If the user fills only up to this level, one can enjoy his drink in peace.
But if adds more of it by filling it more than the certain limit , the cup spills its entire content out of the bottom (onto the lap of a greedy drinker). more “Pythagorean Cup – The clever mischievous cup !”
Engineers at JPL (Jet Propulsion Laboratory) are working on a new class of robotic probe designed to stay aloft for a long time without wings or hot-air balloons in atmospheres of giant planets.
There is no shortage of
something different, challenging & cool things
at NASA & we know that very well. One of them is this- WINDBOTS, the new class of robots.
Unlike moon & Mars which are already been explored by the robotic rovers, the giant gas planets like Jupiter & Saturn have no solid surface on which the rovers can land on. Hence there was a need to think about the probes which can stay aloft for long period of time. In 1995, NASA’s Galileo spacecraft dropped off an atmospheric probe that descended into Jupiter under a parachute.
The battery-powered probe survived only about an hour due to high heat and pressure as it fell into the planet’s deep atmosphere.
Every masterpiece of Engineering is been inspired by one or the another form, directly or indirectly from Nature. Here, the team is inspired by the dandelion seed.
A dandelion seed is great at staying airborne. It rotates as it falls, creating lift, which allows it to stay afloat for long time, carried by the wind. We’ll be exploring this effect on windbot designs.
says Adrian Stoica, principal investigator for the Windbots study at JPL.
POWER SOURCE –
The Windbot must be able to use the energy resources available there. Solar would not be a good option as the probe would find itself on the planet’s night period for an extended period. The team thinks it might generate power by the same way some wristwatches make, by shaking. During the study, the team suspects that to harvest energy, turbulence can be used because in a dynamic, turbulent environment there are gradients – differences in energy from high to low – that can be used.
Windbots would also prove helpful to scientists to study turbulent weather on earth like tornados & hurricanes by transmitting data all the while.
The team has recently begun studying their question, thanks to a one-year, $100,000 study, funded by NASA’s Innovative Advanced Concepts (NIAC) program.
Our daily life Internal Combustion Engines used in cars & bikes can be cooled by air & water or coolant circulating around it. But what about rocket engines ? How rocket engines cooling system work ?
The engines of rocket heat up upto 6000°C. At this temperature, the metals would become so hot that they would melt & even some of them would vaporise. Circulating water or a normal coolant around it wasn’t going to help. Finally, rocket scientists have to take the engine cooling to a whole new level.more “How rocket engines cooling system work ?”