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Scorpion Power System . Ron's RC Helicopters . Thunder Power RC
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TAIL SPIN ON SPOOLUP

BENTDABOOM

Key Veteran

puyallup wa.

.........o

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

08-04-2013 Over year old.
BENTDABOOM

Key Veteran

puyallup wa.

yes its the 401 will try what you suggested re the rudder ATV thanx

while Im here, in HH will give it rudder command either way and the TR wants to bounce, not to neutral only about 1/8 in. from where I gave command, what would cause that?

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

08-04-2013 Over year old.
Zaneman007

Elite Veteran

Texas - USA

Do this on the bench. First make sure that the stick moves the tail in the correct direction. Next make sure that the gyro moves the tail in the right direction. Else the heli will spin like a top all of the time.

I'd recommend that you get someone at your club to show you. This is a very important set up step, but it is easy to mess up.

Old Guys Rule!

08-04-2013 Over year old.
Heliofaguy

Heliman

Schoolcraft,MI-USA

Sounds like your tail rotor servo is working backwards. The trailing edge of your tail rotor blades should point in the same direction you push your rudder stick. Check this out on your bench b4 spooling up.

Chaos 600E, Fusion 50-600, Fusion 50-550, DX8. RCHN#173

08-04-2013 Over year old.
BENTDABOOM

Key Veteran

puyallup wa.

if you mean my 1st post, that's already been fixed thanx to the RR bunch

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

08-04-2013 Over year old.
YSRRider

Elite Veteran

Northern, IL

When I PM'd you, I believe I asked you if you knew how to setup the tail correctly. I never got a reply.

08-05-2013 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

how can the gyro be set wrong?
Because it has to be able to handle any installation, and any helicopter design.

On the top of the 401 is a small switch labeled NOR/REV. Normal, and Reverse. This sets the direction which the gyro will correct when it senses rotation.

Messing with the ATV as recommended by someone will not fix this, ATV or endpoints ONLY affect how fast the gyro will let the nose of the heli spin when you give it full rudder. Set your ATV/Endpoints to 100% to start out.

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Now, to actually FIX your problem.

Move you TRANSMITTER rudder stick to the RIGHT and watch the pushrod on your tailboom. It HAS TO MOVE FORWARD, toward the NOSE of the heli. If IT is pushed toward the tail, then go into your TRANSMITTER channel reverse menu and reverse the RUDDER channel. When you are done, RIGHT stick on rudder MUST make the servo PULL the pushrod forward. Do not go on until you have this set correctly.

Next,

Pick up your helicopter and watch the tail rotor pushrod as you turn the NOSE of the heli to the LEFT. The GYRO must tell the servo to PULL the pushrod FORWARD, toward the nose of the heli. If the servo pushes the rod toward the tail, the locate the NOR/REV switch on top of the GYRO and flip it to its opposite position. When finished, movement of the NOSE to the LEFT MUST make the servo PULL the pushrod FORWARD, to the nose of the heli.

BOTH of these steps MUST be completed correctly BEFORE you attempt to fly.

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Dave

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

Team Heliproz

08-08-2013 Over year old.
dkshema

rrMaster

Cedar Rapids, IA

Everything you need to know about making your 401 work well in your heli. Read it, understand it, and do as instructed, your tail rotor will be well-behaved.

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Mechanically, things are simple. With the servo centered at neutral, the TR pitch slider is centered in its travel range. The servo arm is vertical. Adjust the pushrod as necessary.

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The pushrod supports need to be adjusted on the tail boom so that the pushrod has as straight a shot as possible to the bellcrank that runs the pitch slider, and so that the pushrod moves as freely as it can.

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Set up your gain controls so that the 401 initializes in Heading Hold mode, this is a MUST, to always start the 401 in HH mode. The 401's red LED will be on solid if you do this correctly. If it's blinking slowly, you didn't start up in HH mode. Fix that before proceeding.

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If your transmitter has REVolution Mixing and/or ACCeleration Mixing, DISABLE THEM, or dial them to ZERO.

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Your rudder stick causes the boom mounted TR pushrod to move FORWARD for RIGHT rudder. If not, reverse the rudder channel in the TX menu.

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The GYRO direction switch (REV/NOR) is set so that if you pick the heli up and turn the nose to the LEFT, the boom-mounted TR pushrod moves forward. If not, reverse the gyro using the NOR/REV switch on the gyro body.

This gets the rudder stick and the gyro acting in the proper direction.

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ATV/endpoints -- the endpoint settings on your transmitter are set at 100%. The ATV/endpoint setting will eventually be used to set the desired yaw rate (piro rate), and nothing else.

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Set your RUDDER TRIM in ALL FLIGHT MODES to NEUTRAL. Don't touch the rudder trim tab again. Leave it at neutral in all flight modes. NEVER adjust the rudder trim AFTER you have initialized the gyro in HH mode. To do so will confuse the gyro and it won't work correctly.

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Set the TRAVEL LIMIT on the gyro to 100% as a reference point.

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Set the delay on the gyro to zero.

DELAY is used with slow servos to fine tune the gyro response.

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The travel limit adjustment is used to keep your TR servo linkage from mechanically binding at full rudder command. With the 401, you can't adjust the left and right full travel limits individually, the final travel limit setting is a compromise.

The following steps work best if you switch to rate/normal mode so that the servo follows the stick commands and returns to neutral when you let go of the rudder stick.

Pick a hole on the servo arm that will allow you to achieve the following conditions:

1. Travel limit adjustment ends up as close as possible to 100%, at least no less than 100% without the pitch slider coming up against a mechanical stop at full left/right command.

2. The servo arm moves at least +/- 45 degrees from neutral for full left and right rudder command.

Your goal is to have the tail pitch slider move its full travel, without slamming up against a mechanical stop at either end, with the TRAVEL ADJUST set as close as you can get it to 100%. The servo wants to be able to travel AT LEAST +/- 45 degrees from neutral.

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At this point if you have followed the instructions, you've got at least +/- 45 degrees of servo travel from neutral, the TRAVEL LIMIT setting is near 100%, but not less than 100%. Your pitch slider is centered at neutral, the servo arm is vertical at neutral, your ATV/endpoint settings are at 100%, and DELAY is set to ZERO. Your gyro initializes in HH mode every time you start up your radio system. The tail rotor pitch slider moves as far as it can in both directions without hitting a mechanical stop.

The DS switch on the gyro is ON if you have a digital servo, off if you don't.

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Turn on your radio and make sure the 401 initializes in HH mode. After it does, switch to Normal/rate mode, fire up your heli, and bring it to a hover. If the heli wants to yaw left or right at hover, land, and ADJUST the mechanical linkage until the heli will hover in rate/normal mode without wanting its nose to go left or right.

Recheck and fine tune the TRAVEL LIMIT adjustment so that you don't get mechanical binding, if you had to adjust the linkage at all.

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Switch back to HH mode.

Start with your gain setting around 65%. Fly the heli and adjust the gain setting as required for your heli.

Setting GAIN:

IN HH mode, fly in fast forward flight. Increase the gyro gain until the tail of the heli begins to rapidly oscillate back and forth. Then, simply turn down the gain until the tail stops the oscillation.

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If you find that you want a FASTER piro rate, INCREASE the RUDDER ATV/endpoint value. If you find that you want a SLOWER piro rate, DECREASE the RUDDER ATV/endpoint value.

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If the "piro" (yaw rate) is acceptable, but you find the tail sensitive to small thumb movements around neutral, add in EXPO on the rudder channel to reduce your rudder response around the neutral point. (Since you have a JR 8103, use POSITIVE EXPO to decrease sensitivity around neutral).

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If you are using a Spektrum or JR 2.4 GHz radio in your heli, make certain that you bind the RX with the transmitter set to select Heading Hold mode for the gyro. This is an absolute must, to insure that the gyro is seeing the correct gain/HH setting while the TX and RX are linking up at power on.

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This should take you a long way towards getting your gyro to work well, and your heli to fly as it was intended to fly.

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Dave

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

Team Heliproz

08-08-2013 Over year old.
YSRRider

Elite Veteran

Northern, IL

DKSHEMA, me and atleast 1 other person have PM's him and given him clear instructions on how to setup the gyro but he is either not capable of comprehending the Sesame Street instruction or he flat out is not listening. Minimize your efforts.

08-08-2013 Over year old.
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