And taking it a step further, following the same rules the air/raft makes most of an orbit, reenters the 1D range and the lifter and thrust work again, and it is able to achieve earth escape (hyperbolic excess velocity =5550 meters/second). 
AirRaftOrbTVI.png
This is sufficient for Trans-Venus Injection at certain points of time in our solar system, for example, here is a flight starting on April 13, 2020: 
AirRaftOrbTVI Helio.png

This with a 54-day flight time. Possibly a Traveller extreme sports event, air/raft interplanetary travel. At any rate, as T5 says that interplanetary travel is not possible with an air/raft, I suspect the forward acceleration must be limited to less than 0.98 m s⁻². And that escape orbit was random chance, with some planning a much more efficient (higher velocity) escape could be done.