Tail Rotor Question's

[ChuckTSeeker]

when your new tail servo is fitted and the horn put on at 90deg and it's time for setting up the push rod to the tail rotor, do you just line up the tail blades straight by eye to get them at 0 pitch, or is there a special way to do it?

also after replacing the tail boom and fitting the belt which way should the tail rotors turn when turning the main blades clockwise, looking from the back?

cheers and thanks for any answers

chuck

[hawaiianheli]

The way i do it is i put the slider on the tail rotor shaft in the middle so you have travel in both directions equal and make sure your trim on the radio is in the middle then spool up the heli a litttle and watch which way you heli spins and use your trim to compensate so the tail stops spinning and stays straight. try to get it off the ground just a little then stop heli and look at the angle of the tail rotor blades. then take off the servo horn and center it again with the radio on so the tail blades are at the same angle they were with the the trim adjusted. the tail should spin counter clockwise. and if you have a new servo you may have to adjust the setting on your gyro to reverse or normal.

[LockMD]

when your new tail servo is fitted and the horn put on at 90deg and it's time for setting up the push rod to the tail rotor, do you just line up the tail blades straight by eye to get them at 0 pitch, or is there a special way to do it?

also after replacing the tail boom and fitting the belt which way should the tail rotors turn when turning the main blades clockwise, looking from the back?

cheers and thanks for any answers

chuck


As per a finless video, I dont look at or even worry about the pitch of the tail blades. Just make sure the slider is in the middle and you have the same travel on both sides.

Looking from the back they should spin up into the wash of the main rotors.

looking from the side nose right they should spin counter clockwise.

looking from the side nose left they should spin clockwise.

[ChuckTSeeker]

then take off the servo horn and center it again with the radio on so the tail blades are at the same angle they were with the the trim adjusted.

thanks for the answers guys :thumbup:

but if i did as above, wouldn't the servo horn not be at the 90deg talked about all the time and hence the servo would throw one way further than the other?? or is this the same as adding trim?

i have fitted the S9257 for the tail servo and have it on the standard fittings, i have screwed the ball link in as far as i can and it is about 10 clicks on the Tx trim adjust, to get the blades straight, is this acceptable or will i have to cut the push rod to get it dead right?

if i have to cut the push rod, what is the best and neatest way to do this? can i get one of the ends off, then cut the carbon bar and glue the end back on?

my upgrade is nearly finished just waiting on my SportBEC which should arrive today :lolol
also have just ordered Phoenix for my birthday, ended up getting it from the UK for $131 USD including postage, which converted to $141 AUD :smokin: a lot better than the $225 best price i could find here thats for sure :nanabobo

again thanks for your help everyone

cheers chuck

[sokal]

the tail rotor is designed to pitch more one way than the other
because it takes less for the nose to go left then right
to move the nose right more tail pitch is need due to it has to fight the tourqe from the main rotor

reason why blades are not 0 pitch thier has to be some sort of to push the tail against the natural counter rotation of the main rotor

ie if the main spins clockwise the body will spin counter clockwise to stop that effect a force is need so the slight pitch in the blades at nutrual tail is need to counteract

i know is hard to imagine
but is PFM (pure F@@$$$ Magic)

[ChuckTSeeker]

thanks for that Sokal, so what do i need to do to answer my problem above? are you saying maybe i don't need that 10 clicks of trim to make the blades straight (0 pitch)

cheers chuck

[sokal]

yes
just center the slider on the tail shaft
this will put proper pitch in tail blades
also dont use trim or subtrim while setting up

if your using stock
gyro gain below 50 then center the servo arm then center the slider on shaft

now gain back up to which ever setting is below the tail occilation

64-67 or so

my vids show how
its almost the same for the 401 just dont have the limit POT

but will explain the tail setup

now
you may need some trim for the stock gyro but sub trim is not needed

[sokal]

one problem you will find is the servo you have will over trrow the slider
so place servo arm ball as close to the screw as you can
uless you buy a gyro that will let u limit the servo throw

also dont use the also dont adj the travel adj for the rudder all it will do is slow your piro rate not limit the servo throw

[Wolfpackin]

I found this to be helpful. http://www.x400tuning.com/aligngyro.htm

[ChuckTSeeker]

Thanks guys, i think i nearly have it all now, just one last question, if i do have to cut the push rod to get it right, what is the best way and place along the shaft is to cut and join

cheers chuck