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HelicopterMain Discussion › TAIL NOT ACTING RIGHT
12-19-2013 11:55 PM  3 years agoPost 1
BENTDABOOM

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west seattle

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ok we gotta kyosho SR 30 that has a boom mounted tail servo, when I turn the nose to the right the rod pulls forward so that's ok.
so will get it spooled up and try to lift off give it some tail command and itll swing hard to the left or right but wont stay in the middle so looking for suggestions, I could be wrong but suspecting it could be a bad gyro.

on the other hand something tells me to ditch the boom mount servo
and mount it on the frame like its spose to be, a bit lost at the point

CAUTION!!! politicians may be hazerdous to your well being

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12-20-2013 12:35 AM  3 years agoPost 2
john2012

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brilliant ohio

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what is the tail blades doing and also the leading edge in the front or rear of the tail housing pictures please they will help with the problem. and what type of tx are you using you may need to reverse the tail

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12-20-2013 12:41 AM  3 years agoPost 3
BENTDABOOM

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west seattle

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as far as I know the TBs are on right and spinning in the right direction which is CCW looking at the right side of the model

If I reverse the tail in the radio the the push rod moves back instead of forward when I jerk the model right

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12-20-2013 01:13 AM  3 years agoPost 4
Mark Dean

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Maryland

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You are correct. The tail blades should be spinning CCW.
Turn the tail until the blade grips are vertical. Fold the blades toward the canopy. Stand at the rear of the boom and verify that moving the rudder left makes the top blade point to the left.The controls are correct if so. Verify that moving the heli nose to the right also makes the top blade point left.The gyro direction is correct if so.

There is a set screw that needs to be adjusted on the tail also. If the tail is uncontrollable the set screw is too loose.

What gyro are you using?

Mark

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12-20-2013 01:34 AM  3 years agoPost 5
BENTDABOOM

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west seattle

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You are correct. The tail blades should be spinning CCW.
Turn the tail until the blade grips are vertical. Fold the blades toward the canopy. Stand at the rear of the boom and verify that moving the rudder left makes the top blade point to the left.The controls are correct if so. Verify that moving the heli nose to the right also makes the top blade point left.The gyro direction is correct if so.

the 1st test checks out but the 2nd doesn't, if I jerk the model to the right the TB goes right but the push rod moves towards the front which I thought was right, so now we gotta problem

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12-20-2013 01:36 AM  3 years agoPost 6
BENTDABOOM

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west seattle

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There is a set screw that needs to be adjusted on the tail also. If the tail is uncontrollable the set screw is too loose.
What gyro are you using?

what set screw you mean the 2 that hold the drive wire in the tailbox? Gy240

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12-20-2013 01:52 AM  3 years agoPost 7
mr dan

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Stockton Calif

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Start over. lets ask if you have the tail servo centered first as well as your tail pitch arm should be at 90* to the boom. assuming this is done lets ask the next question:You verified the servo moves the pushrod forward when you give right rudder, the tail slider should move in towards the tail case. if all is correct here, its time to ask if the gyro correction direction is set right. set your gyro to HH, looking at the heli from tail in, move pick up the tail and move it to the right, nose left, note the direction the tail slider moves, it should move inwards towards the tail case. if not simply reverse the gyro's correction at the gyro not in the TX.

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12-20-2013 02:08 AM  3 years agoPost 8
Mark Dean

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Maryland

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the 1st test checks out but the 2nd doesn't, if I jerk the model to the right the TB goes right but the push rod moves towards the front which I thought was right, so now we gotta problem
Just reverse the direction switch on the Gyro to fix that issue.
what set screw you mean the 2 that hold the drive wire in the tailbox?
There is a hole in the tailbox that allows you to verify the set screw is tight.
Start over. lets ask if you have the tail servo centered first as well as your tail pitch arm should be at 90* to the boom. assuming this is done lets ask the next question
Good point. Verify the mechanics are set correctly as mr dan stated.

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12-20-2013 02:11 AM  3 years agoPost 9
dkshema

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Cedar Rapids, IA

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Right rudder at the transmitter makes the tail servo PULL the pushrod forward. The tail pitch slider moves toward the tail boom. If it pushes the rod toward the tail, REVERSE the rudder channel in the TRANSMITTER.

Pick the helicopter up, turn the nose to the left. The servo needs to pull the pushrod FORWARD. If it pushes toward the tail, REVERSE the sense of the GYRO at the GYRO.

Both have to be set correctly or you will never get airborne.

Also, make sure the tail rotor assembly is put together correctly, that all bearings are free and undamaged, and the tail rotor linkage moves smoothly with minimal effort.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

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12-20-2013 03:06 AM  3 years agoPost 10
BENTDABOOM

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west seattle

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Pick the helicopter up, turn the nose to the left. The servo needs to pull the pushrod FORWARD. If it pushes toward the tail, REVERSE the sense of the GYRO at the GYRO.

when I turn the nose left the rod pushes back..so what do you mean reverse the sense of the gyro, you mean the norm/reverse switch?

update heres what I did>>>>>>>>put the gyro direction switch to normal, now when I move the nose left tail right the slider comes in towards the T box, if that's right looks like were good

CAUTION!!! politicians may be hazerdous to your well being

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12-20-2013 03:12 AM  3 years agoPost 11
dkshema

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Cedar Rapids, IA

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Yes, the gyro has a Normal/Reverse switch. IF the servo goes the wrong way when you pick up the heli and turn the nose to the left, flip the Nor/Rev switch to the opposite position. The servo will now move the correct direction based on rudder stick command (you set that in the transmitter), AND on gyro sensed motion command.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

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12-20-2013 03:26 AM  3 years agoPost 12
BENTDABOOM

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west seattle

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one thing I don't understand and have always assumed if ya turned the nose right the rod would pull forward but now it pushes the rod back

CAUTION!!! politicians may be hazerdous to your well being

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12-20-2013 03:43 AM  3 years agoPost 13
adh1000

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coral​springs,florida.usa

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this is an old school heli, is the gyro youre using a heading hold gyro or the older rate mode gyro, if its the older type you might have to use revo mixing in your transmitter to get the tail to behave, otherwise what everyone else is suggesting would be the way to go

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12-20-2013 03:44 AM  3 years agoPost 14
Mark Dean

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Maryland

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Figuring out tail movement by which way the rod goes is not very effective. Your rotation of the tail is ccw and is normal but the slider mechanism may be opposite of the norm. When you give left rudder the leading edge of the tail blade should be pulling the tail right during its rotation. You have to base the direction on which way the blades actually move when the stick is deflected. That is why I suggested to use the folded blade method.

Team Synergy Field Representative, Rail Blades, Scorpion Power Systems

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12-20-2013 01:09 PM  3 years agoPost 15
dkshema

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Cedar Rapids, IA

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The Kyosho Concept pulls forward for right rudder. I check things out prior to posting comments here.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-20-2013 02:25 PM  3 years agoPost 16
dcbusdriver

rrApprentice

Stephens City,VA ​-USA

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Bentaboom, I would tend to agree with dkshema with the gyro sensing being reversed. Also verify that you have the tail blade linkages hooked up properly as well. the slider moving towards the tail box with the pushrod moving forward sounds correct but only if you have leading edge controlled tail blade grip set up. If these should be flipped to trailing edge control then the inputs will be reversed. Just another thing to check.

beating the air into submission...........cool!

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12-20-2013 02:50 PM  3 years agoPost 17
Mark Dean

rrApprentice

Maryland

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The Kyosho Concept pulls forward for right rudder. I check things out prior to posting comments here.
I didn't direct my question to you in any demeaning way Dave. I was only offering to the OP that the tail slider and grip set up may not be default and the direction will not be as described in the original manual. It is always best to verify blade direction.

Team Synergy Field Representative, Rail Blades, Scorpion Power Systems

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12-20-2013 04:11 PM  3 years agoPost 18
mr dan

rrVeteran

Stockton Calif

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I didn't direct my question to you in any demeaning way Dave. I was only offering to the OP that the tail slider and grip set up may not be default and the direction will not be as described in the original manual. It is always best to verify blade direction.
You have a very valid point. The pushrod moving forward is actually correct regardless... the tail pitch arm and slider will move in the same direction as well regardless. Where your point is valid is depending on which side of the boom the tail rotors are on. Most helis now have the tail system mounted on the helis right and thus this is where your tail blade folding makes sense,||-<<< But, should the tail system be mounted on the left such as on my MA Furion 6, the tail blades folded will point away from the boom when given right rudder... but pitch arm will move forward, the tail slider will move seemingly away from the tail case.<<<-||

"R.I.P Roman" Citizen 0094 in the Nation

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12-20-2013 05:29 PM  3 years agoPost 19
Mark Dean

rrApprentice

Maryland

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The pushrod moving forward is actually correct regardless... the tail pitch arm and slider will move in the same direction as well regardless.
This is only valid if the blade grip control is mounted at the leading edge and the rotation is CCW. If either one of those items change the rod direction will also change.

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12-20-2013 05:36 PM  3 years agoPost 20
BENTDABOOM

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west seattle

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ok guys I respect everyones response but think we need to finish this up.
the following is where Im at.

when I give the stick right rudder command the rod pulls forward and the tail slider goes in towards the T box, if this is right just say yes or no thankyou

CAUTION!!! politicians may be hazerdous to your well being

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HelicopterMain Discussion › TAIL NOT ACTING RIGHT
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