I created an aircraft in KSP with my limited parts and at low altitudes it gains speed well and flies well for what I have but when I go above 2000m or so it starts losing velocity. I believe it is due to the lack of air at higher altitudes but because I only have the small intake and have reached my parts limit, I'm not sure what to do to get around this. Here is the craft file to the aircraft. If anyone has any suggestions on improvement I'd love to hear them! Images of when the phenomenon starts and my tech tree are below:
https://ibb.co/r28Pm6G
https://ibb.co/411hHCn
