3fbb94cc   
   From: eripe.dk@gmail.com   
      
   On Sunday, March 5, 2017 at 10:13:09 PM UTC+7, Wolffan wrote:   
   > On 2017 Mar 04, MrAnderson wrote   
   > (in article<1f99ad14-4db1-45b4-93c3-02892643c3d0@googlegroups.com>):   
   >    
   > > So, I just need to know if it is possible to launch human from cannon that   
   > > works like V3 German cannon, just much longer to make acceleration smaller.   
   > > Would there be need to accelerate first in gun and then the bullet with   
   > > people by onboard rockets? What would be the g-forces?   
   >    
   > let’s do the math...   
   >    
   > v = u + at   
   >    
   > u= 0   
   >    
   > v = 8 km/s, orbital velocity, to 11.2 km/s, escape velocity.   
   >    
   > if you keep accel down to ten gees, then t = v/a = 8 x 10^3/100 (make 1 gee    
   > 10 m/s/s to keep things simple) or 80 s to make orbit, or 11.2 x 10^3/100 or    
   > 112 s to escape. (ignoring pesky details like air resistance, of course)   
   >    
   > s = ut + 0.5 at^2   
   >    
   > u still 0, so your linacc would have to be .5 x 100 x 80^2 or 3.2 x10^5 m..    
   > 320 km long. 627.2 km for escape velocity.   
   >    
   > good luck with that.   
   >    
   > oh, you could get it to work on the Moon, but it just ain’t happening on    
   > Earth.   
      
   Unless you can make this one work.   
   https://en.wikipedia.org/wiki/Launch_loop   
      
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