50v2 tail problem

[Hassan]

I have a raptor 50 v2. I'm still breaking in the engine. futaba 9451 is installed on the elevator. Once I apply elevator front or back elevator, the tail wobbles. I run the stock paddles. gy401 with the 9254 servo. What could be the problem.

[Tintin]

Wobbles like in bobs up and down or wags sideways?
What HS?
Blades tight or loose in holders (do they stay straight if you tilt the heli)?

[Hassan]

thanks for the reply tintin. exactly, it bobs up and down. the blade are neither tight or loose. what is hs?

[Tintin]

Most often it's too low headspeed, have you measured yours?

On fixed pitch helis it's vital that blades are in line with eachother to get a symmetrical lift. If they are not the heli will start bobbing up/down.
Low HS on CP helis often result in the same problem, possibly because blades are not swung in place because they are tightened too much or because they move out of position if too loose. Both can be cured with more HS.

[Mike C]

Check for loose elevator linkage ,,,are You allowing stick to spring back to center? if so it will bounce. low head speed will cause the whole bird to do a wobble.

Got the servo good and tight? using the metal plates only leaving out the little brass servo bushings?

[Hassan]

thanks tintin and Mike C. I think its the head speed problem. Coz i thought i wouldn't want to put load on the engine since i'm breaking it in. anyway i'll do what you guys suggested.