So in addition to calculating the IAS incorrectly in Rise, the V-speeds that we were using for stall warnings, etc. were based on TAS instead of IAS! Now that I got the spreadsheet straightened out, I was able to flight prove the Vs1 and Vc speeds at both 35km and 60km.
We don’t have flaps, so there is no published Vs0 speed. We also don’t have to worry about Vr since we have no wheels, but it is interesting to note that the Vmc is so high it will likely still come into play when transitioning from VTOL.
We also have a Va speed, which I always knew as a pilot to reduce to when turbulent air penetration was anticipated – but did you know that means the wing will stall before we can exceed our positive G load limit? Genius!
So I wanted to see what would happen if I failed a flight control (neutral position). If it is either of the upper tail controls, there is some adverse yaw apparent but otherwise flies quite nice. Losing one of the lower tail controls, however, is a lot of work! You basically have to reduce the opposite engine thrust and you can then steer with pitch. Not a great situation but since we are VTOL we could reduce the airspeed quite a bit and rely on vectored thrust to steer.
However, lose an engine and we can no longer VTOL. Contrary to the Dropship from Aliens, we won’t be able to continue VTOL operations on a single engine.