Informative and delightful. Essentially, Spin Launch seems to be a very inefficient alternative first stage with meaningful drawbacks especially in terms of g-forces. Without having done a full analysis, it would seem balloons an airplane launches would have promise for the sorts payloads envisioned by Spin Launch. I also wonder about the implications of the sudden loss of vacuum in the final sized chamber. A fine job of putting the Spin Launch puppy in the "dog house" where it belongs! Thank you!
Why did they cut the exit video clip so short? Because they did not want people to notice that the rocket is turning end over end at 450 rpm (7 turns per second)? Apart for the problems that the spin causes for trajectory control, stopping it will require a nontrivial amount of energy, no?
One of the better videos on spinlaunch. Another problem is the rocket rotating on the arm would have end over end rotational momentum. If the rocket was released at 3:00, by the time the arm reached 12:00, the rocket would already be sideways and in a million pieces. (I’m not even a college grad and can figure this out) I would really like to see spinlaunch investigated for fraud. Again, great video.
If the spinner was evacuated, the diaphragm on the exit port would be supporting some 10 tons of weight from atmospheric pressure. It must be very strong material. How come it is so flat? To get it so flat they would have to put it under huge tension. Why would they go to that trouble? Letting it sag a foot or so would greatly reduce the tension. When the rocket breaks through it, should't at least some of the tatters be sucked back into the spinner? Why did they cut that clip short, before the rocket had completely cleared the diaphragm? Why have they released so little footage of that historic test?
3:30 its not starting tumble. Its rotating because it was spinned up. It is not an aero dynamic effect it just contiues its rotation. If you spin up the system with 400 rpm your rocket spins with 400 rpm. 11:15 Not only the satellite but also the rocket must withstand the g-load. The major problem is that this dramatically increases the structural weight of the rocket. The structural weight is a key factor for a rocket. Higher structural weight means you need more stages and a higher overall weight. So you end up with a rocket wich needs more stages, is more expensive and heavier than the rocket you start from ground. 16:54 the main reason to throttle down is that the upper stage and the payload is designed to withstand a specific maximum g-force. Lower max g means a lighter second stage and therefore more payload. With the payload it is the same, less max g means you can build it lighter. On the other hand when you throttle down you have more gravitational losses. So it is a tradeoff.
What is the formula for the atmospheric drag? An object without any propulsion starts at sea level with a velocity V, say straight up. What is the formula for its motion over time?
@@s2tenglish Thanks. My question was mostly about the drag. I know that at low velocities it is A V^2 for some constant A. What happens at supersonic speeds? Still B V^2 with a different constant B? Then the acceleration would be V'(t) = - g - B (V(t))^2 which means V decreases "exponentially" with time. That is, the initial Mach 6 would drop to below Mach 1 very quickly. Makes sense?
Great video. Thank you. I learned a lot. Totally sane and valid explanation of why SpinLaunch is hopeless.
Glad it was helpful!
It’s a money pit. I’m curious who is investing in this and why 😱 It should be obvious this will never be cost competitive launching from earth.
Informative and delightful. Essentially, Spin Launch seems to be a very inefficient alternative first stage with meaningful drawbacks especially in terms of g-forces. Without having done a full analysis, it would seem balloons an airplane launches would have promise for the sorts payloads envisioned by Spin Launch. I also wonder about the implications of the sudden loss of vacuum in the final sized chamber. A fine job of putting the Spin Launch puppy in the "dog house" where it belongs! Thank you!
Glad you liked it
Brilliant video! Great presentation, great explanation, thank you!
happy to help
Why did they cut the exit video clip so short? Because they did not want people to notice that the rocket is turning end over end at 450 rpm (7 turns per second)?
Apart for the problems that the spin causes for trajectory control, stopping it will require a nontrivial amount of energy, no?
dude this will not work Its just people working because they are getting paid
great job with the presentation very detailed. thank you
Glad it was helpful!
One of the better videos on spinlaunch. Another problem is the rocket rotating on the arm would have end over end rotational momentum. If the rocket was released at 3:00, by the time the arm reached 12:00, the rocket would already be sideways and in a million pieces. (I’m not even a college grad and can figure this out) I would really like to see spinlaunch investigated for fraud. Again, great video.
Glad u enjoyed it but they are not fraud like thereanos they are vapour ware like solar roadway
If the spinner was evacuated, the diaphragm on the exit port would be supporting some 10 tons of weight from atmospheric pressure. It must be very strong material. How come it is so flat? To get it so flat they would have to put it under huge tension. Why would they go to that trouble? Letting it sag a foot or so would greatly reduce the tension.
When the rocket breaks through it, should't at least some of the tatters be sucked back into the spinner?
Why did they cut that clip short, before the rocket had completely cleared the diaphragm?
Why have they released so little footage of that historic test?
is hall mark of a too much promise and too little delivery PROJECTS
3:30 its not starting tumble. Its rotating because it was spinned up. It is not an aero dynamic effect it just contiues its rotation. If you spin up the system with 400 rpm your rocket spins with 400 rpm.
11:15 Not only the satellite but also the rocket must withstand the g-load. The major problem is that this dramatically increases the structural weight of the rocket. The structural weight is a key factor for a rocket. Higher structural weight means you need more stages and a higher overall weight. So you end up with a rocket wich needs more stages, is more expensive and heavier than the rocket you start from ground.
16:54 the main reason to throttle down is that the upper stage and the payload is designed to withstand a specific maximum g-force. Lower max g means a lighter second stage and therefore more payload. With the payload it is the same, less max g means you can build it lighter. On the other hand when you throttle down you have more gravitational losses. So it is a tradeoff.
3:30 NO think about what u are saying .11:15 true only solid system will able to manage it
The electric motor does not need to be inside the vacuum chamber, if you can make really good vacuum seal.
really good vacuum seal on a spinning rod that is the question
New marketing video: ruclips.net/video/yrc632oilWo/видео.html
just that marketing
Great video and superb explanation, thank you sir!
Enjoy
What is the formula for the atmospheric drag? An object without any propulsion starts at sea level with a velocity V, say straight up. What is the formula for its motion over time?
www.grc.nasa.gov/www/k-12/rocket/ballflght.html
@@s2tenglish Thanks. My question was mostly about the drag. I know that at low velocities it is A V^2 for some constant A. What happens at supersonic speeds? Still B V^2 with a different constant B?
Then the acceleration would be V'(t) = - g - B (V(t))^2 which means V decreases "exponentially" with time. That is, the initial Mach 6 would drop to below Mach 1 very quickly. Makes sense?
Great video! I liked details about cost of development of electronics for artillery shell and about HARP results
happy to help
Lets put in seats on the SpinLaunch pod :)
LOL
Good luck finding a hinge……lolololoolol. Great video!
Thanks 👍
Why do you call it "the puppy" ??😊
I like puppy
speak more slowly. diificult to understand. But anyway good content
Sorry about that U can slow down the video to your liking I am dealing with camera recording limit