# RE: starship-design: scoops and sails and something to push against.

```Kevin,

This diagram would be the ramjet or hybrid ramjet

>
> It seemed to me that you were talking about gathering the hydrogen in
> toward the ship, then expelling it again.  ( fig. 1.)  (Note missed
> hydrogen)
>
>
>
>   H    H    H   H   H     H   H
>    \    \ H |   |   |    /   /
>     \    |  |   | H |   |   /
>      \    \  \  |  / H /   /     H
>   H   \  H | |  |  |  | H /
>        \   \ |H |  |  /  /
>         \   | \ | /  |  / H       H
>    H     \  \ | | | /  /
>           \  || | ||  /
>  H   H     \  V | V  /     H     H
>             \ \ | / /   H
>   H    H     \ \|/ /
>               \ | /           H
>                \|/
>                |||
>                [S]
>                [H]
>                [I]
>                [P]
>                |||
>                HHH
>                HHH
>                |||
>                VVV
>
>

This one is the external accelerator

> Whereas I am proposing this: (fig 2)
>
>
>    H    H        H
>    |    |  H     |     H     H
>    V    V  |     V     |     |
>        H   V       H   V     V
>        |       H   |     H
>    H   V  H    |   V     |     H
>    |      |    V      H  V     |
>    V      V           |        V
>                       V
>    - - - - - -      - - - - - -    negative charges
>    -----------[ship]-----------
>    + + + + + +      + + + + + +    positive charges
>    H    H        H
>    |    |  H     |     H     H
>    V    V  |     V     |     |
>        H   V       H   V     V
>        |       H   |     H
>    H   V  H    |   V     |     H
>    |      |    V      H  V     |
>    V      v           |        v
>                       V
>

The problem is how to generate two monopolar fields? If you simply use two
grids, your net thrust will be zero.

>
> Umm... Negative?  By stripping away an electron, wouldn't it be
> positive?  If I'm wrong, then reverse the charges on the above drawing.
>

I'm not sure, but I think you would end up with both positive and negative
ions in roughly equal amounts.

> not if you are swimming in a sea of energy capable of ionizing hydrogen

Umm. there is not really that much usable energy there for the taking.

Lee
```