Whale.

This is coolbert:

Continuing with material as germane to the previous stealth blog entries as seen here and here.

See this video courtesy You Tube the topic of which was the Tacit Blue program. A fly-able demonstrator model [not an unmanned remotely-controlled drone] curved-surface stealth aircraft the original mission as envisioned was surveillance of the battlefield at the very point of contact between two opposing forces. Tacit Blue aircraft referred to as the Whale! It says the demonstrator model now on display at the USAF Museum, Dayton, Ohio, USA? This I do not remember seeing during my most recent visit earlier this year.

As described Tacit Blue unconditionally unstable with regard to yaw [heading] and pitch [up/down motion].

Until the advent of the U.S. Navy MQ-25 [Stingray] Tacit a stealth technology thought to be out of date? But has been resurrected with a new mission in mind, aerial refueling of naval aviation, carrier-borne.With regard to technology better late than never?

Good luck Stingray! 

coolbert.