Thrust to weight or drag
So I'm thinking around my newest winter project, it's my Byron F15, I actually sold it 4 years back because my buddy told me to stick with real jets. Well after 2 different owners it now back at my house.
So I have seen Surlocks YouTube clips of this bad boy flying with a single VT80 barley, then with K140.
So as this Byron is the exact same size as the Fabio 1/7 which typically has 2 K140. Why dose the Byron Fly with 1?
Should I go with a K140 and add ducts and gear doors to decrease drag, or would going to a K210 better.
So what's the rule? 32 pound F15 with K140 will not go any faster unless you decrease drag (ie gear doors and ducts) or if you don't decrease drag it would take 42 pounds of thrust to overcome drag?