RE: Brillelli 366GT *60cc*
3D: DA 50s are not getting 28-32 pounds thrust 24-26 tops. At $595 RTF with muffler you cant go wrong at all.
The old 2:1 ratio for 3D is more of an old "I need" concept since everyone was using horse power calulators and 2:1 was easy to achieve. However in real world numbers the thurst was actually lower than 2:1 and the performance is great.
I have a 15 pound extra (with an empty 24oz tank) with an engine that does 25 pounds thrust (real numbers) and it hovers with ease at 1/4 throttle. So why add the weight to get more thurst? All that does is take your wingloading up. I can also tell you my extra was 16.5 pounds dry with the same engine (before I put my plane on a diet) and it still hovered at less than 1/2 throttle.