Eu imagino que a grade de proteção do disco é capaz de sustentar um pequeno campo de dobra por um curto período de tempo. No caso de separação na urdidura, o disco seria capaz de manobrar na velocidade da urdidura por um tempo limitado antes que o campo de dobra se dissipasse.
Alternadamente, lembro-me de ter lido há muito tempo que os torpedos tinham dispositivos neles que permitiam que eles carregassem uma bolha de arame do campo deformado do navio, de modo que, no caso de serem disparados em alta velocidade, seriam capazes de acelerar longe do navio (e o navio não colidiria com eles); talvez o disco use algo assim.
Referências de Memória Alfa
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Saucer_separation # High-warp_situations
Though highly unadvised, it was possible to separate the saucer from the stardrive section at high-warp velocities. Used by Jean-Luc Picard during the first encounter with the Q, the saucer was separated at a warp speed of 9.5. According to Data, it was highly impractical, but possible with no margin for error. The slightest mishap would have made this attempt deadly. It was also required to clear the saucer section from the stardrive section to ensure safety, because as soon as separation was over, the saucer section would start to lose speed, causing danger to the stardrive section. However, Picard was able to successfully separate the saucer in order to protect the families of the Enterprise from the immense power of Q. (TNG: "Encounter at Farpoint")
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Photon_torpedo # Technical_Manuals
The propulsion system of the torpedoes is a warp sustainer engine. The engine coils of the torpedo grab and hold a hand-off field from the launcher tube's sequential field induction coils. A miniature matter/antimatter fuel cell adds power to the hand-off field. When launched in warp flight, torpedo will continue to travel at warp, when launched at sublight, torpedo will travel at a high sublight speed, but will not cross the warp threshold. (pg. 129)