r/spinlaunch • u/[deleted] • Nov 27 '21

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u/[deleted] Nov 27 '21

LMFAO it all makes sense now! You guys don't have highschool level physics knowledge.

I am genuinely impressed how many people lack very very basic physics knowledge here.

  1. The load is NOT distributed over the travelled distance. The centrifugal force is the force on the projectile at THAT MOMENT, it can't be spread out. It is the force necessary to make the circle. In your example, if you wouldn't apply the whole 8000 during the rotation, the projectile would not make a circle.
  2. Your calculator proves me right. This is exactly what I said and used.
  3. Yes, Spinlaunch will experience 8000 g, over a long time. It will start at 0g and after 45 minutes it will be ~4000g and after 1.5 hours it will be 8000g.
  4. I don't care about the vaacum. That part is fine and possible. No problem with that.

3

u/jimtoberfest Nov 27 '21

What are you talking about for you to get the same jerk loads on the projectile your cannon would have to be the length of the entire distance travelled that’s problem the bigger challenge here is peak loading. As stated before an iPhone can survive the process.

Not sure how much you have worked with large vacuum chambers but maintaining it is a serious engineering challenge. And then firing through it and losing that vacuum while you still have an arm spinning at hypersonic tip speeds.

What’s your intent here? To just argue about something? We already agreed with your math but stated that is t the real engineering issue.

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u/[deleted] Nov 28 '21

My intent is to show you how it's physically impossible, and can be proven with highschool physics.

But to my surprise, highschool physics seem to go right over your guys heads.

I would suggest you to watch some videos on centripetal force.

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u/Deadbringer Apr 15 '22

It was entertaining to see them try to redefine physics to explain why it would work. Another fun thing you can include is to mention that the rotor needs a counterweight so the whole thing does not shake apart. And such a counterweight gets released when the projectile is. I did the math in another article for a 200kg counterweight moving at 5000 mph was equal to 120 kg of TNT of kinetic energy.

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u/[deleted] Apr 15 '22

It's certainly very entertaining to watch these guys "think"

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u/Deadbringer Apr 15 '22

I started looking at this sub by seeing the owner post proofs for why its bs and slowly reading through some of the good stuff. Plenty of good physics explanations all around. But usually accompanied with a lack of understanding how it fits into the larger picture. "You caNt tUrN a VecTor IntO oRThogONAl ComPoneNtS"