tail set up

[nick.m]

hi all..just going through my flybarless controller set up which is a sk540,,now i was watching a video on setting the tail and is says to set it at zero degrees but on here it says to give it 5 degrees offset,,so which do i go with
thx nic

[nick.m]

also how far out from the centre of the tail servo do you put the ball,,ive got mine 11mil but noticed i cant get full tail movement due to the rod from servo to bellcrank catching on the fan surround

[Kevin Dalrymple]

I would set it 5 degrees. It will work better there.

[Brandon Bartolomucci]

You do want the 5 degree offset when the tail servo and control rods are all at 90 degrees.

If you set the tail limits right around where they should be, you'll just be a hair shy of hitting the fan shroud when giving full input on the tail.

You may also encounter the rod hitting your mixture needles on your engine carb, you'll want to slightly twist the carb body away from the rod and you'll have clearance just fine with that.

In regards to the distance mine is right around 11 mm from servo center to ball center & if you're using a Futaba star servo wheel I have mine one hole in from the furthest out.


Regards,
Brandon Bartolomucci
Sent from my iPhone

[nick.m]

ok thx for the info,,now the set up procedure for the sk540 says to get zero on the tail with everything at 90 and it will compensate for the tail,,when i move the pitch stick i also see the tail moving,,so now im stuck on which way to set it up lol

[Matt Botos]

Nick,

Your tail servo pivot ball should be at 16mm from center.

5 degrees will provide a much better performing tail.

Travel to the outside portion of the shaft should be maxed out.

Travel to the left should be left approximately 3-4mm from the bearing.

Check page A43 of the online manual for instructions on how to avoid the carb needles on the OS55. --> http://synergyrchelicopters.com/N5c_Manual_v3.2.pdf

The N5 came out before the OS55 so when the helicopter was first released, there wasn't any interference with the OS50 Hyper needles. The OS55HZ was released shortly after the N5 with a three needle carb.


Thanks,

Matt

[nick.m]

thx for the reply matt,,i was allways told tail servo ball 10-12 mill from centre but i will put it as you say ,,im sure the tail at 5 degrees offset works great but my flybarless software is asking for zero with everything at 90 so surely if the software is expecting zero but getting 5 degrees it will screw it up a little wont it

[Matt Botos]

Try it per the Skookum manual, if the tail feels soft around center then you can go back and make changes.

Thanks,
Matt

[Ross Lawton]

Hi Nick,

I have never setup a Skookum FBL system personnally but generally the best setup for the tail is with 5 degree's of offset pitch to counter the torque of the main rotor, but in this instance i would agree to go with the recommendation of the Skookum manual.

Hope this helps,
Ross

SK 720 Tail Setup Wizard
SK 720 & Spektrum DX8 Setup Requirements
SK 720 & Futaba 8FG Setup Requirements

[nick.m]

thx for the reply ross but my problem now is that with the tail slider bellcrank at 90it looks like there is 5 degrees of pitch so if i set to zero pitch the bellcrank is far from 90 and i only have about 10 mil tarvel 1 way and about 30 mill the other or am i tataly missing something here

[nick.m]

i take it you just losed the 2 set screws and slide the shaft through

[nick.m]

b4 i take it all apart are teh flat spots on the shaft lone enough to allow for moving it

[Ross Lawton]

Hi Nick,
When assembled there should be 5mm of the shaft protruding through past the bearing. This gives proper geometry for the tail assembly.

Check out the N5C Hints & Tips section for a good picture of setting the tail shaft.
http://synergyrchelicopters.com/forum/index.php?board=22.0

The only thing you should really be adjusting is the length of the long tail control pushrod.
At neutral the servo arm should be 90 degrees or as you look it it, as close to vertical as you can get it. The middle bellcrank should be 90 degrees to the main mechanics, once these two are set the small linkage between the servo and middle bellcrank should be the perfect length when set per the manual and flush to the carbon tube.

Im not sure why the skookum requires the tail to be set at 0 degrees as this will make the tail servo work harder and the tail will also have a natural tendency to spin with the torque of the main rotor by not having the pre torque offset in the tail rotor system.

Hope this helps,
cheers,
Ross

[nick.m]

i understand that and thats how ive built the tail which looking at it gives me around 5 degress of pitch on the blades when the tail slider controll arm is at 90,,but as i need zero degrees pitch how do i achive this and keep the arm at 90 and my slider in the middle of the shaft,,,if i set blades to zero at the moment the arm is a long way from 90 and the pitch slider is only 10 mil away from the blades so not much travel this way and about 30 mil travel the othet way

[Ross Lawton]

Hi Nick,
If you are trying to get 0 degrees on the tail rotor and also keep the arm at 90 degrees then i don't think it is possible. You will have to set it so there is offset in the bellcrank if you are setting it at 0 degrees.

You will be better off achieving this by adjusting both ends of the long tail on troll pushrod so that you maintain a sufficient ammount of threaded rod in the ball links.


Hope this helps,
Ross