The idea of using huge cards and keeping your images on the SD card isn't a good idea.
If you value your work, several 16GB cards is a good idea and swap them out each flight.
Copy them across to your computer every flight and format the card.
Both should be identical picture size but because of file compression the jpg files will have a smaller file size (7-9 MB vs 35 MB)
Don't feel that jpg is horribly inferior.
There's a common idea that raw is "best" because serious pros use it but for probably 90% of users jpg is all they need.
It's a lot easier to deal with if you aren't wanting to do serious post processing and the jpg quality from the Phantom is very good anyway.
I swim against the tide and shoot professionally and I use jpg almost exclusively and get very good results.
Every shot in this gallery was shot in jpg:
Shipping 2017 - Above & Beyond Photography