I possibly have a good idea: Is it possible to make an XR5 model with standard turbine engines instead of scram jets? This would be nice for those long subsonic flichts before you have to use your main engines.
ORBITER-FORUM will be temporarily closed at 2026-07-23 18:00 UTC while we complete some OF maintenance tasks. The amount of downtime is expected to take up to one hour, but probably less.