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LabRat Scientific
Добавлен 8 авг 2017
Vector Basics
This LabRat video gets back to some engineering basics and provides an overview of vectors and basic vector mathematics. It includes some theory, a few simple demonstrations, and example problems to help clarify the concepts. This video is intended for high school teachers and students, but beginning physics and engineering students might find this information useful.
Просмотров: 1 627
Видео
Bernoulli Principle - Generating Lift
Просмотров 2 тыс.5 лет назад
This LabRat video discusses how the Continuity Equation and Bernoulli's Principle are applied to the concept of lift generation. The video outlines the basic physics, shows the derivation of some applicable equations, and provides some simple experiments that support the theories addressed. This information is geared towards the advanced high school physics student and early university students...
Work - Pulleys and Springs
Просмотров 2,4 тыс.5 лет назад
This LabRat video takes another look at the concept of Mechanical Work, this time from the perspective of pulleys and springs. The video presents basic physics concepts and includes experiments to validate the applied theories. This video is geared towards the beginner high school physics student and high school teachers.
Hydroelectric - Part 2
Просмотров 5605 лет назад
This LabRat video is Part 2 in a 2-part series on building and testing a home-built hydroelectric generator. This episode expands on the hydroelectric generator electrical and mechanical design presented in Part 1. In this video, the water wheel is constructed and tested to validate the design. Several experiments are conducted in order to develop a simple analysis tool and an experimental flum...
Hydroelectric - Part 1
Просмотров 7235 лет назад
This LabRat video presents electrical theory, mechanical theory, and supporting experiments associated with the design of a crude, home built, hydroelectric power generating system. A simple test apparatus is used to conduct the necessary tests. Part 2 in this series will address the actual water wheel hardware and experiments to see if it can actually produce electrical power.
Rolling Bodies
Просмотров 1,4 тыс.5 лет назад
This LabRat video discusses how Kinetic Energy and Conservation of Energy apply to circular objects rolling down an inclined plane. Simple experiments are used to validate the physics and mathematical analysis. This video is geared towards high school physics teachers and students. More information on this topic can be found at www.labratscientific.com.
Parachute Opening Loads
Просмотров 3,6 тыс.5 лет назад
This LabRat video investigates the loads that are experienced by parachute while it opens and how they can be estimated. The video includes some basic physics, shows how to estimate opening loads, and provides some experiments to support the theory. This video is intended for high school teachers and students. More information on this topic can be found at www.labratscientific.com.
Parachute Physics
Просмотров 34 тыс.5 лет назад
This LabRat video discusses the basic physics behind non-gliding parachutes. The video includes insights on the physics, provides some mathematical analysis, and presents parachute drop tests to determine the drag coefficients of small test parachutes. This video is geared towards high school physics teachers and students and beginning engineering students. More information of this topic can be...
Work-Energy Theorem
Просмотров 3925 лет назад
This LabRat video discusses the Work-Energy Theorem which shows the linkage between mechanical work and the change in kinetic energy. The discussion includes basic physics, mathematical analysis, and experimentation to demonstrate that the Work-Energy Theorem can be used to predict particle velocities associated with a known applied work. This video is intended for high school teachers and stud...
Orbits - Why Satellites Follow Curved Trajectories
Просмотров 3,9 тыс.5 лет назад
This LabRat video outlines two physical descriptions as to why orbiting objects follow a curved trajectory around the earth. One description deals with horizontal and vertical distance travelled over a time period and the other deals with the balance of the gravitational force and the "centrifugal" force due to the speed of the orbiting object. This video is intended for high school teachers an...
Santa Physics
Просмотров 1715 лет назад
This LabRat video explores a few concepts associated with Santa's Christmas trip around the world. It hits on a few fun facts dealing with the monumental task of delivering gifts to people all around the world and touches on Newton's 2nd Law of motion. Rocket Sleigh experiments are conduced to demonstrate how the acceleration of an object is dependent on the object's mass. This video is intende...
Balsa Wood Bridge Testing
Просмотров 24 тыс.5 лет назад
This video shows how the Method of Joints analytical approach can be used to analyze the forces in a simple balsa wood truss bridge. Balsa wood bridge models are subjected to load tests in an attempt to see if identified zero-load members are critical to the structural integrity of the bridge models. This video is geared towards advanced high school physics student and entry-level engineering s...
Truss Analysis - Method of Joints
Просмотров 1,8 тыс.5 лет назад
This video addresses the concept of "Method of Joints" which is used to analyze truss structures. The video includes basic theory, uses a simple example to demonstrate the computational method, and shows an experiment that validates the theoretical results. This video is intended for advanced high school physics students and beginning engineering students. More information on this subject can b...
Estimating Rocket Size using the Rocket Equations
Просмотров 7 тыс.5 лет назад
This video provides an introduction to the "Rocket Equations" which are used to estimate the size of an orbital rocket. Concepts such as launch velocity, Delta-V losses, mass fraction, and structural ratio are discussed. An example problem is worked to show how the equations are used and the results are compared to an actual rocket. This video is intended for high school teachers and students a...
Matter - Phase Change
Просмотров 1,8 тыс.5 лет назад
This video reviews the concepts of melting, vaporization, and freezing in association matter changing from one state to another. Two simple experiments are conducted to recreate relevant sections of the cooling curve for water. A more detailed companion lesson can be found at www.labratscientific.com. This information is geared towards high school teachers as well as students in physics and che...
Model Rocket Stability Test in a Wind Tunnel
Просмотров 21 тыс.5 лет назад
Model Rocket Stability Test in a Wind Tunnel
Introducing the labratscientific STEM Education Website
Просмотров 2675 лет назад
Introducing the labratscientific STEM Education Website
Mechanical Moments and the concept of "Summing of Moments"
Просмотров 1405 лет назад
Mechanical Moments and the concept of "Summing of Moments"
Moment of Inertia and the Bifilar Pendulum
Просмотров 42 тыс.6 лет назад
Moment of Inertia and the Bifilar Pendulum
Thanks! Helped a lot with understanding truss problems
this is just me changing orbit in ksp no ifs ands or buts this is all i use when prograde and retrograde
Agree with another viewer's request to see and understand how the wind tunnel works ?
Outstanding analysis and video quality ! Your serious about this hobby, terrific explanation 😊
Excellent video lesson ! Not only a great video on what is center of pressure but also why it is important to the flying characteristics 😊
thank you it helped a lot
F(ab) goes down right? it is already proven in this equation 6:49 so why does you calculate it goes up in the other equation? 7:35
Best teacher I ever saw on YT! Few resources and tangible explanation makes invaluable information transfer to everyone! Thank you so much for sharing!
By the way, thank you. Just a thought though, would it not make sense to take away weight to enforce the center of gravity instead of adding? That would help for speed.
I am a distant relative of the Lee family from the same area. Most of my family on that side lost their lives in Coal mines. I have fought, starved, and survived that life to work in the aerospace and military supply area. I was on the Trident missile program and Raytheon missiles. A late starter at age 32, I am a living example you never give up and fight until your last breath. I am now with a a break-off company from Raytheons best inventors to help with innovation and new future ideas. We are part of our ancestors and though we improve on those characteristics, we should still be thankful for the sacrifice they made.
So, build your rocket, with everything that you want it to fly with and in the approximate location of where you want your items to be. Then "teeter-totter"(highly scientific) static balance it on the table, and mark that spot. Take your string and tie it to that balance point, and give it a swing. If it swings straight into the airflow,,your getting closer to flight. Once that's set,, start moving the string back(twoards the fins) until the model goes unstable to see where the CP is to make sure you have the body tube diameter margin away from the CG. Yes??.
What effect do the walls of the tunnel have on tests like these? I recall that the NACA* guys had some way to compensate when testing airfoils, but I don't know what it was. *Before NASA. Lots of great info dug up by them.
Just look how the post starts wobbling when the string is pulled in. Angular momentum is clearly transferred from the ball to the setup. Conservation of angular momentum is only conserved in an isolated system.
Come back. Come back from wherever you are.
But how are you supposed to calculate when it breaks ??? Ive been searching all day. I need to calculate when it will break
This will depend on the materials you use (as well as how you connect your members together). A given material will have a tension member capacity and a compression member capacity -- these known values tell you how much force, in tension or compression respectively, a member can sustain before failure.
That's a very infirmative and educative ,all the best Sir , Thank you .
One body diameter is the go to number for Stattic Margin, but why one diameter? I understand the math, I'm quite certain a Static Margin of .2 would be unstable. But why was 1 diameter chosen?
Sir why did you stop uploading these videos. I guarantee you will be successful on RUclips if you cracked the algorithm a bit better
Airplanes use cg and cp also..
This is so dumb. First of all, the axle needs to be stiff, not a ridiculous wobbly piece of wood that changes all the physics. We don't see any actual measurement being made. You are simply using the argument of authority, which is just pseudo-science. Here is a real experiment done with actual measurements directly visible on the video: ruclips.net/video/abuPJesWQRY/видео.html
Nice video! Brasil
I remember when I believed in space travel.
Ggggoooood
Clearly, you are a crackpot who doesn't understand basic physics: ruclips.net/video/RE-6s1B-lc8/видео.html
So it’s not the expulsion of mass exiting the nozzle (action-reaction) as much as it is the pressure acting on the front of the motor?
Thank you!
Soo in conclusion, we need to make rocket lenght 2x max lenght of solid sugar motor?
What if all poor countries die? Will you create a new one or will you shoot missiles at yourself? Just interesting
You are right; I didn' verify if in science your talks are true but I projected to make some tests in manual. No need Gyro, computer at beginning as complex electronic guidance!
thanks for this , was very helpful
The slow-mo of you swinging the cylinder around your head was Hollywood-level. A true work of art. You looked like a majestic and benevolent lion, taking a well-earned day off from mauling zebras to enjoy a day in the park.
awesome
So when the mass is increased with a constant parachute area and shape the drag coefficient should decrease? the greater the mass the higher the terminal velocity since terminal velocity is squared and is inversely proportional the drag coefficient should decrease right?
Can this method be used to measure MOI of an asymmetric complex object by keeping the strings at a equal distance from centre of mass ???
my favourite subject. rocket science. Thank you, i learnt so much today. what about fuel distribution. Weight pay.load capacity? great teacher you are Sir. simple and to the point.
your test are for a horizontal flying rocket like an air plane but rockets fly vertically
For wind tunnel testing the horizontal or vertical orientation doesn't matter. What does matter it that the test object is in the right orientation with respect to the "relative wind". For the rocket, the nose needs to be pointing into the relative wind - the wind generated by the wind tunnel. As far as the rocket is concerned, there is no difference whether the test is done vertically or horizontally as long as the rocket is pointed into the airflow - the stability dynamics are the same. All pitch/roll/yaw dynamics act about the CG and the CG does not change for the vertical or horizontal direction. All NASA rocket wind tunnel tests are performed horizontally. In addition, it is much easier to build a big wind tunnel in the horizontal plane rather than the vertical. Hope this helps...
it was really helpful sir...keep up with such content. Thank You
Thank you, professor. Rockets are a fascinating matter.
from costa rica , keep the great awsome informative works coming
Beautifully explained
Why does the nose produce lift when it's symmetrical?
The nose is symmetrical relative to the air flow when its axis of symmetry is aligned with the air flow (i.e. no angle of attack). The rocket is always pitching (or yawing) during flight and thus has a oscillating angle of attack (negative, zero, positive, and back again...) When the nose cone is at an angle of attack it is no longer symmetrical relative to the airflow and thus produces lift. If you had really big fins the rocket would be very stable and the oscillating angle of attack would be small. In this case the nose lift would also be small.
Простая стабилизация не выход. Необходимо проворачивание ракеты вокруг продольной оси. Для этого хотя бы поставьте стабилизаторы под небольшим углом 1-2 градуса к продольной оси. Самостабилизация ракеты происходит тогда, когда центр тяжести ракеты расположен впереди центра давления воздушного потока. Ваша ракета будет летать нестабильно.😊
Excelente video... me surge una pregunta... cómo se auto estabiliza el centro de gravedad ante la continua variación de masa de combustible? ... muchas gracias... saludos
I loved this explainer, without fancy graphics nor music, i did really learn from it, amazing one, keep doing more like this one
I'm just here to up my KSP game
excellent video , thank you to share your knowledge
Just a heads up, your audio is only coming out of the left channel
I am here for just to play kerbal space program better
What's the intuition and mathematical justification of why the CG of the lateral area approximates the rockets CP?
I didn't come up with the approximation method, but the "logic" is that the area of the components (fins, body tube, nose cone) are an indication of the associated lift. The body tube is symmetrical and balances at its CG. The CP for a cylinder is at the its center. Thus the CP is at the same point as the CG for the shadow model. As the area of the fins gets bigger ("heavier" on the shadow model) it pulls the shadow model CG back. The "heavier" fin shadow is akin to more fin lift. As the nose cone gets longer or the shape changes the nose cone shadow becomes "heavier". For example, an ogive (curved) nose cone shadow model has more area and thus is heavier than a conical nose cone shadow model, and in reality the Ogive nose cone generates more lift than an conical one. The shadow model is a very crude predictor of stability...
4:16 I think the better explanation would be if you take the total cross-sectional area of the rocket and divide it by two, the dividing line would be the center of pressure. The drag produced on each side would be equal to each other.