Space catapults are not a thing and never will be

Not sure if this should be in "humour".... after all, that famous documentary Robin Hood : Men In Tights had a stealth catapult.

https://y.yarn.co/c59d8a36-647a-4257-bad8-735aad550e5d_screenshot.jpg

Until recently, few details about SpinLaunch have been available. SpinLaunch’s website is password-protected, and some Sunnyvale, Calif. job listings merely refer to it as a “rapidly growing space launch startup.” But last month, a bill was proposed in the Hawaii state senate to issue $25 million in bonds to assist SpinLaunch with “constructing a portion of its electrical small satellite launch system.” Hawaii hopes to gain construction contracts and jobs, and meet government goals for expanding space accessibility, by helping SpinLaunch.

SpinLaunch replaces rocket boosters with a kinetic launch system using principles “similar to those explored by several ground-based mass accelerators that date back to the 1960s. Modern adaptations include electromagnetic rail and coil guns, electrothermal-chemical guns, light gas guns, ram accelerators and blast wave accelerators.”

“SpinLaunch employs a rotational acceleration method, harnessing angular momentum to gradually accelerate the vehicle to hypersonic speeds. This approach employs a dramatically lower cost architecture with much lower power.” SpinLaunch is targeting a per launch price of less than $500,000, while Yaney says “all existing rocket-based companies cost between $5 million and $100 million per launch.”

... and always twirling, twirling! TWIRLING toward freedom !

SpinLaunch plans to use a centrifuge spinning at an incredible rate. All that momentum is then harnessed to catapult a payload into space at speeds one source said could be around 3,000 miles per hour. With enough momentum, objects could be flung into space on their own. Alternatively, the catapult could provide some of the power needed with cargo being equipped with supplemental rockets necessary to leave earth’s atmosphere.

3,000 mph is 1.3 km/s, nowhere near the ~8 km/s for low earth orbit.

https://techcrunch.com/2018/02/22/spinlaunch/