Help needed with the GY401 Gyro setings :o(

[cambs flyer]

If this tread ends up helping others, then it'll be a result on all fronts!

[scallybert]

The GY401 must be switched on in Heading Hold mode, so whichever gyro switch position you have that on, make sure that is selected before you power up the heli. Then leave it to set for a few seconds.
The light will go solid red on the gyro to show it has initialised correctly.
It needs to do this every time you power on.

Wayne has a Spektrum set-up. With these, when the Rx is powered up, they'll take up a default value on the various channels (except throttle, IIRC) that they learn when you bind the Tx & Rx.

Once a connection is stablished between Tx & Rx, the Tx will dictate these various values. However, there may be several seconds between Rx power-up (which probably corrresponds to gyro power-up), and the Tx-Rx connection being established.

I tend to power up the Rx first, as this avoids a quick (re-)connect being incorrectly signalled by the Rx LEDs; but since you can't guarantee it won't take several seconds for the Tx & Rx to connect, the gyro may init before it see the settings from the Tx

It therefore seems like a good idea to bind with the various values that you want the gyro to see at power up.

Just set the Tx as people advise, then re-bind.

Apologies if I'm making this sound more complicated than necesssary.

[robgt]

Yes indeed - I have the same (Spektrum setup) on my heli's. If ever the heli is slow to bind, I always switch it off and start again to make sure the bind takes place before the gyro initialises. Just to be safe.
I always switch on Tx, then Rx - and reverse to switch off

As far as I know, all Spektrum channels take up that default value, including the throttle, which is why you should always do a final bind with zero throttle after setting up the heli to ensure that, at failsafe, you have zero throttle.

Cheers,
Rob

[cambs flyer]

As always many kind thanks to everyone who spared the time to help me.

[cambs flyer]

This isn't a problem, I'm just don't understand why this happens, OK this is what I do.

When I first turn on the DX6i and plug a battery to the 450 the cyclic servos make a quick movement then the tail doesn't seem to center off and the Gyro's red LED flashes.

But once I disconnect the battery and connected it again, while the TX is still on and untouched, the heli starts up perfectly, tail kicks in the red LED is solid, and there after, no matter how many batts I pump through her she starts up perfectly with no probs'.

It just seems that first connection after switching on the TX for the first time makes the Gyro's LED flash when I first connect a batt', then after disconnecting then reconnecting the batt everything's fine, but as soon as the TX is switch off, once you switch it back on I always need to do the above, then after that all's well?

Got any ideas pep's, should I be concerned about this at all?

Many thanks for any advice.

[marktigere1]

Sounds similar to my Rappy when I first put my DX6i on.

I rebound the RX and all was well.

My Rappy has a 401.

[cambs flyer]

Thank you Mark.

I've tried different batts, and on some she fires up perfectly after switching the TX on, then I can switch it off then on reconnect the same batt and it flashes, but after disconnecting the battery that first time and reconnecting it she's as good as gold there after.

I guess it could be the fact it's a cheap TX and taking that into account an odd start up glitch can happen, but if you have it too, maybe it's just nature of the beast with that gyro/batts/TX, as I say alls fine after the first disconnection, and I was a little concerned if honest why it happens.

Thanks mate.

PS, when you say rebind, you disconect the battery too

[cambs flyer]

Anyone else experenced this or know of the above happening?

[marktigere1]

PS, when you say rebind, you disconect the battery too

Just bind your TX to your RX in the normal way described in the DX6 manual.

Solved my intermittent problem and it has never returned in over four months.

Cheers

Mark

[cambs flyer]

Thanks mate.

What happens and I've done quite a few experiments and its always like this, I plug a batt to the 450, the 401's LED flashes twice, break, twice.... And the manual say's if this happens the neutral point on the TX doesn't match the Gyros neutral position, however once connected a second time both match up perfectly, and every other battery after that while the TX is still switched on.

There's nothing physically wrong just a slight clash of interests until both the 401 & DX6i agree what the neutral position is, after the first start up.

[Boggy]

you are in effect causing the rx to do a quick reconnect wayne! the same as if you would have had a power failure.
i would do as mark suggests center your trim reset your throttle failsafe position and rebind

[cambs flyer]

Thank you Ron.

Yes I'm going to do as instructed, at first I was a little concerned, but after doing some reading and the help of you guys I'll have it licked in a moment.

I've got to say flying her before without any tail gyro input made for some challenging and busy flying, in a strange way it was kind of fun, but limited what you could safely do with her.

With the 401 engaged she's rock solid & very enjoyable.

Oh why I think of it, do any of you know where I can buy a twin battery connector with Deans, so I can fly my 500 with a pair of 2100 3C batts.

Many thanks for any help.

[scallybert]

Thanks mate.

What happens and I've done quite a few experiments and its always like this, I plug a batt to the 450, the 401's LED flashes twice, break, twice.... And the manual say's if this happens the neutral point on the TX doesn't match the Gyros neutral position, however once connected a second time both match up perfectly, and every other battery after that while the TX is still switched on.

There's nothing physically wrong just a slight clash of interests until both the 401 & DX6i agree what the neutral position is, after the first start up.

This being the case, what I said about binding applies.

Once the Tx & Rx are connected, the gyro gets its input from the Tx.

Before this, it gets the default input that you set when you bound the Tx & Rx.

If the Tx is off, or it takes a long time to connect, the second will apply when the gyro inits.

I checked this with a DX6i & (non-QC) AR6200 that I was playing with while putting my H200 together. You can clearly see it happen on the swash servos.

BTW, and following on from what Boggy says, I power up the Rx first, with Tx down. Otherwise the Rx LEDs will (almost) always indicate a quick-connect, and I might miss if one has happened in flight. (Which is often a precursor to a disaster.)

[cambs flyer]

Thank you for that mate.

[j42]

Anyone else experenced this or know of the above happening?

Hi I have just got a gy401 and it does the same.I thought it was just me doing somthing wrong.when I first switch on the gyro normally flash's if I turn it off then on again it normaly sorts it.

you are in effect causing the rx to do a quick reconnect wayne! the same as if you would have had a power failure.
i would do as mark suggests center your trim reset your throttle failsafe position and rebind

How do you set the failsafe position.I've had my DX6i for 2 years and never relised you even had this option