Pinnacle
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its simple, does not house any emitters or anything for that matter.. The spine is like a plain fuel tank that extends to the back of the plane.
The aerodynamics of the spine are shaped that way to minimize drag. Mn the block 52+ models the spine houses emitters, avionics etc. Its design is made to suit the aerodynamics of the F-16.
The first F-16 with a spine was the AFTI demonstrator.
As you can see, its not exactly very large and was mainly for avionics, when the Israeli's saw this.. they wanted it for their F-16's so they could fit their own EW systems on it. As the aircraft grew.. more and more EW systems were wanted and the spine was enlarged to accommodate them.
There will be very little in terms of Avionics... only whatever has been displaced by the addition of the second seat will be moved into the spine.
Thanks alot ... Much better explained..!!