Tail setup on a twister 3d

[Gaza07]

ive set all my twister 3d up but iam having problems with the tail my gyro is a airtrix a500-g the problem i seem to have is when in normal mode the and trimmed to hover every thing is fine altho i do seem to have to do quite a few corrections to the tail
when i switch to heading hold the tail becomes out of trim and i have to trim quite a bit of left in if i switch back trim it back to the right
anyone know if this is normal or do i need to set some thing up
i realy dont have a clue what im doing
also when in heading hold if i dont touch anything the rudder goes to full right and the servo buzzes as it pushes against the end if i start the main rotor this normaly stops do i need to set a end point for the gyro ive set it for channel 4 rudder but it doesnt seem to have much effect

[Raptorite]

It sounds to me like the tail wants setting up mechanically. The model should hover with the tail holding firm in normal mode, if not then the mechanical setting of the tail pushrod length or position isnt quite right.

It's not as easy with the little twister as it is with the larger IC models to set the tail up, but what you need to do is as follows;

Before you start, make sure all the trims and sub trims are centred and the ATV's for the rudder are both 100% (full movement) Set the gyro gain to about 55% in both heading hold and normal modes and make sure you have the throttle curve set so you have a flat curve from bottom to top in idle up 1 of 85%.

1. Hover the model in normal mode and apply as much trim as needed on the rudder to get the tail to hold in the centre.

2. Land the model and disconnect the tail pushrod from the servo arm and whilst holding the rod in exactly the same place, with your other hand move the trim on the transmitter back to the centre. Observe or measure as best as you can the distance between the ball on the servo arm and the position of the ball link on the rod.

3. Having made a note of how much the servo needs to move and in what direction, let the tail pushrod drop down onto the bench and unscrew the two screws that hold the boom clamps for the servo in place. Slide the servo along the boom so the ball on the servo arm is on the right place, and retighten the two screws.

4. Attach the tail pushrod back onto the servo and hover the model in normal mode once more. If the model still wont hover straight on its own, repeat the steps above until it will. If it hovers nice and straight, then youre done, put it back in heading hold mode and enjoy

Cheers,
Pete.

[Gaza07]

Hi Pete thanks for the reply are you saying i should hover the model in idle up 1 with the throttle set to 85%
ive been hovering it in a non idle up mode with the throttle set linear 0 25 50 75 100 could this be why the tail doesnt hold to well coz of the varying head speed
it does seem to make sense to have a constant head speed and more speed to the tail
hope i dont sound to thick

[Raptorite]

Yes almost certainly, these little electrics need a high head speed to get the best out of them, which includes tail thrust, so the gyro would have been struggling anyway.

If you fly with a constant throttle curve, and therefore head speed, the tail wil be far more efficient as it is also running at a constant thrust and the gyro will have far less of a headache keeping the tail in check. I would try playing with the throttle curve before you start worrying about setting up the tail.

Cheers,
Pete.

[Mercuriell]

Obviously you need to check that REVO and rudder mixing are off. My Telebee gyro on the 3D, which looks similar to your Airfix gyro, also creeps to full travel in headlock mode and the instructions say this is normal. After a lot of heading problems I bit the bullet and bought a new gyro and proved that the original was faulty from new - the lesson trust no one or no thing even when new - a lot of the stuff we use can only really be tested by substitution with a similar component.

[marktigere1]

Interesting thread.

My Airtrix also now moves to full throw when in HH mode.

New gyro methinks.

Cheers

Mark

[Gaza07]

mark is yours in a twister 3d and if so what head speed have you tried
im waiting for the wind to drop to try some of the advise offered earlier
ill post here if it cures my problem

[marktigere1]

Hi Gaza

I use my gyro in a Trex CCPM (CDE).

Head speed I am guessing is around 2000 rpm. I don't have a tacho but this is a second hand Heli from a mate and as I have not altered it this was his head speed.

I never got a great deal of flight testing with different amounts of gain on the gyro as it took a dive last weekend and I think the Gyro received a bit of a hit as it is not functioning correctly now in HH mode.

Cheers

Mark

[Gaza07]

maybe these gyros are 50 quids worth of junk i wouldnt know im new to all these flying food blenders lol
in hh mode my servo moves to one side i was told its looking for a input and when i move the stick it does settle down and hold the tail better than in normal mode but it still creeps about hopefully a higher head speed might sort it out well i hope
sorry to hear about your crash

[marktigere1]

I noticed if I increased the gain, the drift of the servo got quicker which suggests to me there is something wrong with the gyro. Tail blades should not move when gain is increased on the bench. Sounds a bit like your problem.

If you are in any doubt, change it as a crash costs more than another Gyro, believe me.

My Shuttle has a CSM HL200 which is the basic model of the CSM range but does everything it should for about £50.

I intend to get the uncased version of this for the Trex as it seems fine.

Cheers and good luck.

Mark

[abyiss]

here are m8,,,,go check this out...mayb some help...


http://www.rcmods.co.uk/gyros-c30.html

[Ade_Law]

whilst the CSM stuff is ok. I do seem to spend much more time getting them to work than i do a 401. Also they dont seem to be as consistant requiring fiddling later on too.

if you are going to replace the gyro then spend the extra money on a gy240 or gy401 you will not regret it.

Ade

[Gaza07]

ive had the chance to test out raptorites suggestions today and the tail does hold much better now with the higher head speed i did set idle 1 to 85% and try it but felt a little nervous with it like this i thought it was twitchy before its quite weird the throttle only altering the pitch
altho i can see once ive advanced more it will be the way to go

so i altered my normal throttle curve to give me a higher head speed at half stick and this is how i feel happy with it at the moment

[Ade_Law]

its not about throttle its about headspeed. The reason we need a throttle curve on a glow is that is what is required to give a constant headspeed.

now on electrics they are by their nature a constant speed device the throttle sets the speed and the motor willl do its best to maintain that by drawing more current.

so even in normal mode your going to be better to set the throttle curve to:

0
60
75
75
75

Ade

[Gaza07]

Yup i can see that now
iam totaly new to all this and have no heli people local to me to help all my rc m8s are plane flyers and think im a turn coat