4 ms·
I think they were referring to the fact the air has to move out of the way, and in a tunnel there's less space for the air to move to, thus the drag is higher e
by Robotbeat 8y ago
I think they were referring to the fact the air has to move out of the way, and in a tunnel there's less space for the air to move to, thus the drag is higher especially if the cross section of the vehicle is near the cross section of the tunnel.
- Retric 8y agoIt’s something to consider, but you need actual numbers to do so. Are we taking 1/3 Atmospheric pressure and 3 inches of clearance vs 1/300th atmospheric pressure and 3 feet of clearance. Really, nobody is going to build a system where this is a significant issue past the design stage. So, IMO it’s a consideration but a non issue.