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Many turbofan-engined Caravelles have a prominent anti-shock body where the horizontal stabilizers attach to the vertical tail, about a quarter of the way up the latter. (Turbojet-engined Caravelles don't have it.)

For instance:

Caravelle with a carrot up its rear

(Image by Aldo Bidini at Airliners.net, via Russavia at Wikimedia Commons.)

This Caravelle 10B, however, does not:

Caravelle sans carrot

(Image by Rob Schleiffert at Flickr, via Helmy oved at Wikimedia Commons.)

Why do some turbofan-engined Caravelles have an anti-shock body in this location, while some other instances of the very same Caravelle variants lack one?

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    $\begingroup$ It looks like an application of area rule to compensate for the fan's lager nacelles, which were likely increasing the build up of the transonic shock wave behind the engines. $\endgroup$
    – John K
    Commented Mar 18, 2023 at 15:06
  • $\begingroup$ @JohnK: Then why didn't all turbofan-engined Caravelles have this anti-shock body? $\endgroup$
    – Vikki
    Commented Mar 18, 2023 at 15:09
  • $\begingroup$ Not sure, but the non-fan engine in the lower pic is quite a bit forward from the one in the top pic. Maybe other turbofans also have the forward engine placement? $\endgroup$
    – John K
    Commented Mar 18, 2023 at 21:30
  • $\begingroup$ @JohnK: Both of the pictures in the question are of turbofan-engined Caravelle 10Bs. The difference in apparent engine position is an artifact of perspective resulting from the differing angles at which the two aircraft were photographed. $\endgroup$
    – Vikki
    Commented Mar 18, 2023 at 21:37

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