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this post was submitted on 15 Mar 2024
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What if the interior of the railgun accelerator was all a vacuum and the exit point was really really really really tall? So that impact with atmosphere at the exit of the gun was lower.
This is what StarTram is, the launch system maintains a vacuum. The system won't work without that feature.
The problem is that you still need an additional acceleration in order to get into an real orbit. In any theoretical orbit (without an acceleration) you'll always go around in a circular motion until you reach your starting point, if your starting point is in the atmosphere then you'll go around your orbit until you hit your starting point in the atmosphere again. This will obviously cause your orbit to decay. There are a few solutions.
I love the idea of combining the rail launch with a skyhook. Skyhooks always sounded like they would fail due to atmospheric concerns which this would alleviate.