Originally Posted by
Rhino power
Underpowered? No...
Spey - 12,250lbs dry, 20,515lbs reheat
J79 (GE-17) - 11,900lbs dry, 17,900lbs reheat
Unfortunately, the fuselage mods to allow the Spey to fit (wider intakes needed for increased mass air flow, deeper and wider rear fuselage) ruined the area ruling and increased drag to such an extent that much of the expected benefits of the increased thrust of the Spey were lost.
-RP
Of course I should have said slower, thanks for that Rhino. I take it from your moniker, you're a fan of the Mighty Toom as well.