What size ipad fits the Phantom 4 RC Holder without having to buy an extra piece? Sorry, Im new to this Drone...Thanks

Hi there. Thank you for reaching out. It's about a 6'' maximum width requirement for the tablet to fit in the device holder of the DJI Phantom 4 without modification. Hope this helps. Thank you for your valued support.

iPad mini tablet fits, but only gen 4 works as far as I can tell

Aloha Ingy,

     The 10.2 inch tablets can fit if the holder is stretched to maximum.  However, it is highly advised that tape be put over the rubber pads of the holder so the rubber is not destroyed when the tablet is regularly swapped out and put back.

     Hope this helps!  Take care and be safe!

Aloha and Drone On!