[Aztek1701]

Hi there,

Wagging on a model is usually indicative of one of three problems..

1. There is stiffness somewhere in the linkage between the tail servo and the tailblades. This could really be anywhere, from the pushrod to the tail pitch slider. ESPECIALLY on the 400 sized models, the tail linkage needs to be really free. To test.. Disconnect from the tail servo and move it by hand. If it feels stiff then you need to find out whats causing it an free it off. Usual culprits are the ball joints on the bell crank or the tail pitch slider assembly. You can buy a ball joint reamer that will free off the ball joints without making them sloppy.. silicon grease or oil sometimes helps too. Id be willing to bet that this is the problem on your 400 since its a pre assembled machine.

2. Gain in transmitter is too high... Every gyro is different but try reducing the gain. The wag may go away but if it stays but just gets slower look back to 1. If the gain is too high you'll get a wag whatever happens. The trick is to get it as high as possible without the wag.

3. Static tail pitch not right... All driven tail helis need a certain ammount of static pitch at centre stick on the rudder to counter the helis normal torque. (Its ususally about 5 - 6 degrees) If its too much or not enough the head hold system in the gyro then has to work extremely hard to maintain the heading. Result, it doesnt quite make it and the tail wags. The test for this is (if your competent) flip off the head hold in a hover with neutral rudder. If it suddenly pirouettes then this is the problem. You either need to adjust the length of the linkage between the tail servo and the bell crank or move the servo slightly up or down the boom to adjust the pitch.

Radds school is a good way to learn. Keep at it guys

Take Care... Azzy