The Syma S107 is a remarkable little RC heli – despite some possible quality issues in recent times. It is very robust, stable and easy to fly – exceptional value at around AU$30 delivered. Of course, what is really lacking is insanity, so here’s how I went about turning it into an unstable, twitchy and fast monster.
Weight savings is where it’s all at I reckon. Fitting a more powerful tail motor might help, but it is extra weight and power. I instead focussed on stripping as much weight as possible, and shifting weight bias forward for increased forward speed, at the expense of rear speed (or even stable hovering!).
Here’s where I saved the weight:
- Removed undercarriage (1.91g)
- Removed tail brace (1.20g)
- Removed tail rudder (0.44)
- Remove nose cone, weight and led (3.26g)
I also shifted the battery as far forward as possible. One other weight saving was trimming down the balance bar weights. Unfortunately the new S107’s don’t have removable weights like the originals did. Instead, I cut a small section off the end of the weight. Not sure on the exact weight, but since it is rotating mass, it makes a huge difference in rotor acceleration. Stability is affected, however I see this as a positive since it gives more twitchiness.
A total saving of approximately 6.8g. With an approximate stock weight of 38.3g, this gives a saving of around 17.7% – very, very noticable. Hovering can be achieved at around 1/3 throttle (instead of around 2/3 stock), and banked turns are possible due to the increased forward speed. Highly recommended mods once you get the hang of the stock S107 and are looking for a bit of insanity.