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The X-54A is not the S-21. The S-21 aircraft was a proposed joint venture between Sukhoi (OEM of the SU-25, 27, 31, etc) and Gulfstream. That project/coordination was cancelled in the early 90's.Gulfstream does not consider sustained supersonic flight practical/economical/marketable with the current subsonic restriction overland. They have clearly stated they will only pursue a SSBJ if the current laws can be ammended.Informed friends of mine say the X-54A will be a technology demonstator based on an F-104 powered by a PW F100-229. The picture I saw did, in fact include "loop" winglets.BTW - GIIs and GIIIs are powered by RR Speys, not Tays. The Tay is on the GIV/G450.cheers....
The X-54A is not the S-21. The S-21 aircraft was a proposed joint venture between Sukhoi (OEM of the SU-25, 27, 31, etc) and Gulfstream. That project/coordination was cancelled in the early 90's.
Gulfstream does not consider sustained supersonic flight practical/economical/marketable with the current subsonic restriction overland. They have clearly stated they will only pursue a SSBJ if the current laws can be ammended.
Informed friends of mine say the X-54A will be a technology demonstator based on an F-104 powered by a PW F100-229. The picture I saw did, in fact include "loop" winglets.
BTW - GIIs and GIIIs are powered by RR Speys, not Tays. The Tay is on the GIV/G450.
cheers....
