Belt CP set up after upgrade

[heli-si]

As some of you are aware I had a bit of a tail spin issue, now resolved. I have managed to get everything set up pretty well, but I can't seem to stop it wanting to drift left as I lift off. I have checked the swash plate and that is set nice and flat from all angles and using the trim on the TX helps slightly but seems to be fighting the problem rather than fixing it.

If I get the helicopter further off the ground by ignoring the "drift" will it stabilise on it's own as it couls be due to air bouncing off the floor and disturbing it, or do I need to set the swash plate biased that way to counter it ? or could it be something else. As I sid I am new to Helis so treat me gently and assume I need walking through the solution.

It is a drift rather than the heli trying to fip over on it's side. It seems to me getting close to being quite stable when a few inches off the ground now.

[airtime0007]

hello mate. This threw me off to start with as well. the drift is perfectly normal and is due to torque effect of the main rotor blades. all helis do this and depending on which way the main rotors spin, will do it one way or the other

[unwind-protect]

It's called 'translating tendency'. As the tail rotor provides a force to stop the helicopter spinning, it also produces a sideways force that pushes the helicopter left. It's not something that you can trim out, and contrary to some people's belief, it doesn't go away when you get higher (as you will find out when you start doing nose-in hovering).

All that is needed is a small right cyclic input as you come into the air to allow the main rotor thrust to counter the tail push. The helicopter then sits in the air at a slight angle, which is perfectly normal. This does all assume that your swashplate is level, and the helicopter is properly trimmed and balanced so it has minimal tendency to roll or pitch without command.

Unsurprisingly, this was one of the first things I added to the 'Frequently asked questions' page or RC Heli Wiki!

[airtime0007]

yeah i spotted it there after a couple of days of wondering what the hell was going on. unfortunately they dont put this forums address in rtf heli manuals

[heli-si]

cheers again for the advice. Looks like I will be learning to counter it then