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starship-design: Re: Re: Fwd: Re: starship design

> Here is a little more about the pion rocket. There is 
> also a 20,000 pound tank containing the 100,000 pounds 
> of ordinary hydrogen to mix with antimatter in the form 
> of antihydrogen, This pion rockets useful payload is 
> 20,000 pounds.To get more useful payload the pion 
> rocket must be scaled up. A 600,000 pound pion rocket 
> could carry 40,000 pounds of useful payload and 
> accelerate it to 72 percent of light speed in a year. 
> A 6000,000 pound pion rocket could carry 400,000 
> pounds of useful payload.. The antihydrogen is stored 
> in the magnetic bottles in the form of antihydrogen 
> ice. The antihydrogen is zapped by a low power uv 
> laser to vaporize it a little bit at a time, and ionize it.
> Electrostatic repulsion of the negatively charged 
> anti protons causes ===

> ==The vehicle frame, magnetic nozzle, engine, magnetic 
> vacume lines, matter-antimattermixing chamber, and 
> magnetic storage bottles are made of steel.   The rest 
> of the vehicle is made mostly of aluminium metal. 
> There is also a steel radiation shield around the 
> antimatter-matter annhilation engine which is part of 
> the 20,000 pound pion engine weight.
> Timothy J. Mayes

You have a lot of numbers, but I don't know where you got them from.  How 
does a 20,000 pound engine with shielding give 60,000 pounds of sustained 
thrust?  Where do you get those weight numbers from?