tail slider centering trex 450 sport

[loz]

many people on forums and websites say to get yr tail slider dead centre, and even after watching finless bobs tail/gp750 setup vid i still dont quite "get it", i set mine up in rate mode as he says then switch to HH, he says its critical to get the tail slider exactly central whilst lining both tail blades one in front of the other to help with this setup, now... if i put my slider in dead centre the heli will just spin left or right, i can only get my tail to hold if the slider is offset giving the blades some degrees of pitch, so could someone explain what im doing wrong

[vinny155]

its a complicated one and i probably woulnt be the best to explain it to you but basically your main rotor is creating thrust one way so the tail blades have to have a little bit of pitch on them to counteract the torque of your main rotor,thats the easiest way i can explain it,i fly in heading hold so the tail holds itself but if your tail isnt set up reasonably good it overworks the gyro,get ir right in rate mode i.e. where the heli isnt spinning and when you set to hh you should have a well set up tail,somebody please correct me if im wrong

[loz]

but to get it to hold in rate u need an amount of degrees of pitch (i think) which now makes the slider offset

[vinny155]

when i set up in rate there will be a slight degree of pitch to keep the heli straight which in turn means the tail slider is slightly offset,this is the way i do my helis,works ok for me

[loz]

thats exactly what i do now, but why does finless and others say to set it up in dead centre, its confusing

[bolders]

but to get it to hold in rate u need an amount of degrees of pitch (i think) which now makes the slider offset

If you want to use rate mode then you need approx 7 degrees of pitch going against torque of the main rotor. On the sport you will have to move the slider off centre to achieve this. It will just mean that your end points are not equal however this is not a problem but you will need to re-set your end points on the GP750.

I personally just set the slider to centre and and always use HH although either setup will work.

[loz]

If you want to use rate mode then you need approx 7 degrees of pitch going against torque of the main rotor. On the sport you will have to move the slider off centre to achieve this. It will just mean that your end points are not equal however this is not a problem but you will need to re-set your end points on the GP750.

I personally just set the slider to centre and and always use HH although either setup will work.

so, if i set up in hh and set slider to centre will the heli not just spin say 45 degs on take off until gyro locks in?

[bolders]

so, if i set up in hh and set slider to centre will the heli not just spin say 45 degs on take off until gyro locks in?

No the gyro is operating from the moment it initialises and will do all the work - you may have to make some small corrections during spool up if you change the heading of the helicopter after the gyro has initialised though.

You may get a kick if you ramp up the head speed to quickly but this will occur no matter what mode you are using.

[loz]

No the gyro is operating from the moment it initialises and will do all the work - you may have to make some small corrections during spool up if you change the heading of the helicopter after the gyro has initialised though.

You may get a kick if you ramp up the head speed to quickly but this will occur no matter what mode you are using.

ok cheers maybe ill give that another try then

[cjcj1949]

Setting the slider in the middle is a good idea but not vital. In the middle it will give you an equal swing left and right of central which might give you an equal spin rate. I doubt if that concerns you at the moment.

To stabilise the tail you need to have about 7 degrees of pitch on the tail blades to the right. That is essential. Either you can put it in, or you can rely on your gyro to do it for you in Heading Hold. In rate mode you can put that offset in by trim, subtrim or by mechanical adjustment. On some tails designed by some sort of heli god and manufactured by perfect beings, putting the slider in the middle will give you the 7 degrees of pitch. In the real world it is often a matter of undoing the grub screw and moving the assembly until you get the 7degrees.

There isn't a fixed figure for all helis. To make helis work you have to lean the rotor disc to the right (usually) to balance the force produced by the tail. The force from the tail is needed to stop the heli rotating due to rotation of the main rotor. The size of that offset force depends on the heli geometry.

In an ideal world the main rotor wouldn't rotate. It would just produce lift without rotation. It is this bodge that leads to all the other bodges.

[BaRoN30s]

I personally just set the slider to centre and and always use HH although either setup will work.

i also do this i dont see the point in getting a HH gyro & then using it in rate mode (even though it has it) just set everything central & let the HH gyro do the work..
BUT make sure you have a good head speed or you may find you cant get it locked in solid...

[loz]

ok cheers, well ive put tail slider to centre, its in HH, and i have a good headspeed, so ill test it out later and see if i can get it to hold

[loz]

ok that was easy enough dont know what i had been doing wrong before but went out for a quick try tonight and have realised that centering the slider in hh does work, so correct me if im wrong but as far as i can work out if i setup tail to hold in rate mode by off setting the slider i can fly hh and rate both at the flick of the gyro switch, or if i setup slider dead centre i can only fly it in HH mode as i would imagine tail will spin if i switched to rate? does that sound right?

[bolders]

ok that was easy enough dont know what i had been doing wrong before but went out for a quick try tonight and have realised that centering the slider in hh does work, so correct me if im wrong but as far as i can work out if i setup tail to hold in rate mode by off setting the slider i u can fly hh and rate both at the flick of the gyro switch, or if i setup slider dead centre i can only fly it in HH mode as i would imagine tail will spin if u switched to rate? does that sound right?

Yep thats correct

[loz]

i think ive finally sussed it lol (with everyones help of course)