Setting the main blades of the ECO

• Fastening the blades

Fastening the blades

Fastening the blades with the correct tension is important. At spool up the blades will fold back as they will lag. When the rotor is at a non-zero pitch setting (it almost always is at spool up), the tip of the blades will point up or down with positive or negative pitch setting respectively.
As the blades will not lag equally there will be an enormous difference in angle of attack between the two blades. This will result in a very aggressive wobble. It can become so big that the blades strike the tail boom even before the rotor get up to speed.

To prevent this you need to fasten the blade holding screws. Don't fasten them all the way as you risk crushing the blades and then risk spitting the wood. The blades also need to be able to move fore and aft during flight. This is called the swing hinge and is important for stability, specially during forward flight.

So how much should the screws be set?
Fasten them until the blades just slide down when the Helli is on it's side. Once you get comfortable flying it you can experiment with the setting.