C/F is correct. I want to say the XL main fuselage was close to 4 inches longer overall from the standard Bobcat.

Using either the P-60 or P-70, you should see flight times in excess of 6 1/2 minutes from brake release without the header tank. I ran the header tank in my COmposite Bobcat with a P-60 and set the timer for 8 1/2 mintues from brae release, never had any issues with fuel.