I have over 1000 flights on three Roo's with no UAT's. I have used pop bottles, juice bottles and now I use one DUBRO 50 oz center, 2 DUBRO 24 oz on either side on the main tank. On top of the main tank, I have a 6 oz tank with normal heavy clunk. I always land with the header full, and never have bubbles in the header. I have never had a flame out in all these flights. The turbines are two AMT USA Mercury's that just run and run.
Ron