you see Lothor's Zord then that is
when it goes into Sentai footage however it comes from Hurricanger 50.
New footage of Lothor's Zord
Once you see the Ninjazords, it's just Sentai stock footage. The
following scene which shows Zentipede/Lothorzord comes from Hurricanger
At this point in time, this shot
is something I'm
unsure about however after viewing the rest of 51, I can confirm that
this is new footage.
However this shot of the Lothorzord is when the footage begins to come
from Hurricanger 51
Once you see the Wind Rangers on the ground following the Storm
Megazord's destruction then that is when it goes back to new footage.
Here's a shot of the Abyss opening from above ground
Blue's Ninja Sword