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HelicopterMain Discussion › AAHHHH...Need help with my GY401
04-01-2005 11:24 PM  13 years agoPost 1
jd21476

rrNovice

Oceanside, CA

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I can't figure this thing out. My Nexus 46 was dialed in before I put it on now all it seems to want to do is spin.

First off, on this helo should the DIR on the gyro be on normal or reverse...I can't tell because no matter whic direction I have it set it seems to want to spin opposite my control.

Second, when the light is solid red on the gyro that should mean its in HH mode, correct? Then why the hell does the thing start to spin out of control as soon as I start to add throttle?

I am asssuming my tail rotors are not centered with the servo but I am not sure how to do this.

I am so frustrated can someoen please help?

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04-01-2005 11:28 PM  13 years agoPost 2
SLiebl

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Lancaster, PA - USA

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Maybe you have your servo reversed? It's one or the other, the gyro, or the servo direction. What did you have on there as far as a tail servo before? If it was a Hitec or JR most likely you need to reverse the servo if you're using a Futaba now.

-Steve

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04-01-2005 11:33 PM  13 years agoPost 3
cwright

rrKey Veteran

Blossvale New York

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Make syre that you don't have on any revo mix either. Sounds like it is a servo reversed or the gyro is reversed. Chuck

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04-01-2005 11:44 PM  13 years agoPost 4
Leif

rrElite Veteran

USA

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Most likely you still have REVO MIXING enabled from your previous gyro setup.

Set ALL revo mixing points on ALL of your flight modes to zero. Then, check the gyro again. You also need to set your rudder trim position to zero before turning on the RX power.

To check the gyro on the bench, first use your radio to determine which way the tail servo moves for a turn to the left. Then, phyically move your heli a bit to the right and see if the gyro puts the same "left" servo movement in. If not, then you need to change the direction of the gyro's "direction" switch.


Leif

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04-02-2005 12:02 AM  13 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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The advice to find out which way the servo must move for a left turn, then turn the heli to the right while watching the servo is right on. If the servo needs to pull the pushrod to turn the nose to the left, then the gyro should also command the servo to pull when you turn the nose of the heli to the right.

Set the DIR switch to make this happen.

The 401 MUST be powered up in HH mode. If you apply power in normal mode, all bets are off on what the gyro will do.

If you have REVOlution mixing enabled in HH mode, that's bad. You need to disable REVO mix in HH mode.

Whatever channel you are using to control the gyro sensitivity: Settings between 50 and 100% give you HH mode, 0 to 100% sensitivity. (50% setting is 0 sensitivity, 75% setting is 50% sensitivity, 100% setting is 100% sensitivity)

For values on the control channel 0 to 50, the gyro is in normal (rate) mode. Setting channel 0% is 100% sensitivity. 25% on the setting channel is 50% normal mode sensitivity, 50% on the setting control is 0% on the gyro.

Your mechanical setup should be correct before putting the gyro in line. If not, stop and fix it. Use the LIMIT adjust on the gyro body to keep the TR control system from binding at the endpoints when you give it full rudder stick. the gyro will then keep the system from binding no matter what your ATV/Endpoint settings are.

Start the gyro in HH mode. This is an absolute must, then let the heli sit still for about three seconds until it finishes initializing. Switch to NORMAL mode then hover the heli, making what ever mechanical adjustments are necessary to keep the tail where you want it in a hover. At this point you should be able to switch back to HH mode and fly.

When in HH mode do NOT use the rudder trim tab on your TX, it will confuse the gyro about where neutral is.

Dave

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04-02-2005 12:14 AM  13 years agoPost 6
jd21476

rrNovice

Oceanside, CA

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How do I disable REVO mixing? I have an Optic 6 tx. Does anybody know?

Also, I noticed that when it is idling in HH mode and I switch it to normal gyro mode (no light on the GY401) then the motor on the helo dies. Any suggestions?

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04-02-2005 01:40 AM  13 years agoPost 7
Leif

rrElite Veteran

USA

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Do you have a manual for the radio? From what you described, you probably are using the "flight mode" switch to select normal vs. HH on the gyro.

If this is the case (the switch might be labeled "idle-up"), then you REALLY need to make sure that your radio is correctly programmed. The Idle-up switch on most radios offers the ability to set different throttle/pitch curves for different kinds of flight. If you've never used that switch before, chances are that a default pitch and throttle curve are programmed for the mode you're switching into.

The BEST ADVICE for you now is to locate a heli pilot who can help you IN PERSON. There's only so much advice that can be correctly given over the net, and a competent heli guy could probably get your heli set up in very short order. You will NEED to bring the radio manual with you since not everybody has heard of an Optic 6 radio. Who manufactures this radio? I've never heard of it.

In the radio manual (assuming it is a heli radio), they should mention revo mixing and how to program it. This varies by radio. My old Futaba 6VH used adjustment potentiometers for this, with one pot controlling positive revo (high stick position) and the other controlling negative (low stick position). For that radio, I would set both pots to zero with a HH gyro. My newer Futaba 8U uses digital programming through a series of menus, with individual 5-point revo curves offered for each of the flight modes. For HH, I set all of the revo curve points to zero for each flight mode.

Good luck.

Leif

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04-02-2005 01:05 PM  13 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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Here's the text of my post to another on the same subject....let me know if you need any help with the Nexo.
Andy

I'm running a Futaba Gy401 on a Futaba radio system and the gyro reverse is in normal.

When you give RIGHT rudder the servo pulls the rod toward the front, and the tail pitch slider moves towards the tail rotor gear box.

LEFT the servo pushes the rod towards the back and the tail pitch slider moves towards the tail blades.

If these are correct, proceed, if not reverse the rudder channel on your transmitter then proceed.

Looking from the right side of the ship, with the tail blades at 3 and 9 oclock, the right blade leading edge (the 3 oclock blade) should be facing upwards towards the main rotor.

When the stick and trim are centered in Rate Mode (non HH) the servo arm should be straight up and the tail pitch slider control bellcrank (the one the push rod attaches to at the back) the front of that bell crank should be parrallel to plastic bracket that the bell crank screws into, and 90 degrees to the tail boom, this will just about center the tail pitch slider. You can look straight down, the leading edge of the bracket and the bell crank should line up. (this can be adjusted where the 2 pushrods meet behind the body)

If these are all correct pick up the model by the head and swing the nose to the LEFT, the servo should pull the rod towards the nose (giving right to compensate) If thats wrong, flip the reverse switch on the gyro and try again. If its still wrong, replace the gyro.

Andy
AMA 77227
http://www.jaxrc.com

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