I’ve searched and searched, and it’s probably out there but I can’t find the answer to this question.
The shuttle, and all other spacecraft today launch vertically. Looking at concepts of 2:nd generation shuttles they all launch vertically.
I figure there must be som major reason for doing this. Lauching horizontally must be much more efficent. You wouldn’t need nearly as powerful engines, and as much fuel. This reduces weight and cost. Also it would be more practical to use an ordinary airstrip than a launch tower, and you wouldn’t need crawler transporters (Shuttle), or trains (Russian way) to transport the spacecrafts/rockets.
Why do we launch spacecraft vertically?