RE: Hitec 5645 servos, Are they good servos?
I have flow gasser with both nylon and metal gears, from my experiance nylon gears have been stripped by gasses as small as 40cc BUT "only when engine is out of tune" or unbalance prop,
the times I have stripped nylon gears on gassers has been when I am tuning the low neddle and the engine starts 4stroking hard the vavrations are so intense you will see waves in your covering and nylon gears will strip.
would I recomend nylon gears on a gasser, depends. I would use nylon gears only if i woldnt care to much about what I was flying, if its a nice new shine plane please use metal gears unless you dont care tomuch about the plane.