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HomeAircraftHelicopterSynergy R/COther › Tail set up Question
01-13-2009 11:30 PM  9 years agoPost 1
cdmc0125

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Hot Springs, AR

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Heres the problem. I'm running the G770 3D everything is set up on a 90, when I try to set the servo end points, I get not enuff movement to the left and not enuff to the righht. When I turn the ajustment to more to the left it hits on the bearing the inside of the tail hub. Can enyone give me some help here on how to fix this.
Thanks
Chris

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01-14-2009 03:14 AM  9 years agoPost 2
cdmc0125

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Hot Springs, AR

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Let me try it again does anyone know how to set a tail up on a synergy N9? I think I,m on the right forms right????

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01-14-2009 01:10 PM  9 years agoPost 3
fr8brkr

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Asheville,NC

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I am not exactly sure what problems you are having - getting the travel endpoints on the 770 gyro correct may be due to having the servo horn distance to the ball incorrect. The 770 I believe set-up is very similar to a GY401. Be sure to have your tail servo horn centered in rate mode and as close to 90 degrees as possible without using subtrim.

Problems ? -- Mine are flown in fresh daily

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01-14-2009 01:23 PM  9 years agoPost 4
Chuckie

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Crofton Maryland

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Yes but you have a JR gyro setup question more than an synergy setup question.

The 770 has one adjustment for servo travel on the gyro. Turn it up and adjust the length of the rudder rod on the boom until you have no binding but even throws right and left. You may have to play with the links on the rudder rod turning one in or out to get the even travel. Just disconect the link at the tail box bell crank and check for end binding at that point. If the servo travel on the gyro is maxed and you still don't have full even travel then check the ball position on the servo arm. How far out is it installed? If you use the + or Plus servo arm for servos like futaba the outer hole is something like 16mm and that should be enough.

Did you see the N9 settings in the manual? I would recommend you not run 150 ATVs as the manual states. The expo is supposed to be set very high as well but you might want to follow those settings. With 50 expo and 150 ATV the tail is very slow around center then blazing and too fast if you give a lot of rudder. This was on a Trex 600N, not sure about the N9. I found the 770 hard to get flying well on a friends Trex 600N. It would have either too much tail wag (high gain) or a loose holding tail (low gain).

Make sure you run the stock shim under the crown gear in your N9 when using this gyro.

Regards

Charles

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01-14-2009 07:13 PM  9 years agoPost 5
cdmc0125

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Hot Springs, AR

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I adusted my control rod to make it longer, is what the problem is.. is that when my tail servo horn is at 90 my blades have a ton of pitch in them. they should be at zero right. when I adjusted the control rod to get the blades and slider closer to center and zero pitch, I get a more ever throw. So I guess the qustion should have been: Is the pitch slider and blades supose to be centered and zero degrees pitch?

The servo horn ball is at 14mm per the manuel
Thanks

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01-14-2009 08:13 PM  9 years agoPost 6
HiroboFreak

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Central Coast, NSW, Australia

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Don't worry about how much pitch is on the tail blades, just have the pitch slider in the centre of it's travel when the servo is centred.

Adjust limits & horn position from there.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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01-14-2009 08:25 PM  9 years agoPost 7
Chuckie

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Crofton Maryland

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they should be at zero right?
NO!

There should be some pitch on the tail blades to counter the torque of the rotor head spinning when the heli is hovering.

The quick way is to look at the tail box bell crank with the rudder servo at mid position (gyro in normal mode) and check to see the bell crank is about 90 degrees to the boom rod. This doesn't validate that you have no binding but gets the link length close.

To test for binding follow my first post, "Turn it (the gyro travel) up and adjust the length of the rudder rod on the boom until you have no binding but even throws right and left. You may have to play with the links on the rudder rod turning one in or out to get the even travel."

With the radio and heli on disconnect the link on the tail bell crank. While holding right rudder note how far the link would have pulled the bell crank in one direction. Move the bell crank your self to see if it would bind. Then give Left rudder and check the ball on the bell crank again. The amount the link moves on both sides should be the same and a little shorter (like 1 or 2 mm) such that you don't over drive and bind the servo. Adjust the link in or out at the tail box side and test again. Once you see the link is at the right spot reconnect it to the bell crank ball. Check for binding again by giving full right and left rudder. The servo should not sound like its binding on either end.

If 14mm doesn't give you enough travel with the gyro maxed out it might be ok as you never really use all the rudder travel in flight.

Charles

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