castrol,,,,, I have both the Famous F-4E and F-16 70mm EDF jets. I love them. The F-4E is easier,,,,opjose is right on with his evaluation. The flight times with the 4S 2200 batteries are about 4 minutes at full power,,,,,5 1/2 is you throttle back for most the flight. If you want an upgrade batteries for these,,,I got this; HYPERION G3 VX 2600 MAH 4S 14.8V 35C/65C LIPOLY PACK. It fits perfectly in both jets and gives you better power and about 2 more minutes flight time.

And yes,,,,about 20% expo will help the handling!!

I like the F-4E better. I also have the Famous A-7 but I can't find it anywhere now. The A-7 is 70mm also with no gear,,,hand launch only,,,,,but it is way faster and better handling than the F-4 or F-16.

Hope this helps!

Randy