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HomeAircraftHelicopterMain Discussion › Tail rotor/slide issue
10-13-2013 05:59 PM  4 years agoPost 41
bikersurgeon

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Monett, MO-USA

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When I recently rebuilt a 450 tail I inadvertently got one of the slider link screws a bit too tight and it wagged...changing the gyro gain changed nothing. I popped the tail rod off the tail servo, moved it by hand and realized it was not sliding freely, loosened the screw a little so it slid effortlessly and it worked great. It's always the simple things that get me lol.

TT .90 TOW, TT x50, TT 50se, Ergo 60, TT .50 apache, MT cobra, MT, Trex450, 450 airwolf, TT .30,

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10-14-2013 02:25 PM  4 years agoPost 42
fly-45

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west des moines, iowa - usa

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Juan R
I checked all those points you mentioned, everything seems to be OK.
Took the plugs out and reseated them.
From what you are saying, it sounds like my issue, but everything is plugged in correctly.

bikersurgion
I check the slider again, but it seemed Ok, nice and smooth, no glitch.

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10-14-2013 05:54 PM  4 years agoPost 43
JuanRodriguez

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The Villages, Florida

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Ok... you need to do a simple test.......
Go to the gear slot in the receiver and remove the single wire lead coming from the gyro that controls the gain.... plug in a regular servo into that receiver slot. Adjust your end points to 100 % on BOTH sides of the switch..... Turn the system on as usual and flip the gear switch to each position. The servo movement should follow the switch flipping.....

Alternatively, you can go to the monitor screen on your transmitter (pretty sure your DX7 has one). While in the monitor screen, look at the gear channel bar. Then flip the gear switch. You should see the bar move from its current position to the other side of center each time you flip the switch..... The percentage values you have currently set will determine how much the bar (or cursor) moves.

The point of that whole exercise is to determine whether or not the gear channel is "active" or "inhibited"......

If it's inhibited, therein lies your problem. You'll need to find that in your menu and activate it. If active, then you can go back to the receiver and ENSURE that you plug in the gain lead from the gyro in the gear slot of the receiver with the CORRECT orientation.....

That is, that single lead from the gyro MUST be plugged in so that the single wire is IN LINE with the rest of the signal wires plugged into the receiver. since you're using Futaba servos, that signal lead is white. You can easily overlook this part so please make sure it's plugged in correctly otherwise your gain adjustments will NOT work !

You said you tried dropping the gain from 85% to 50% or 55% ? Try something more drastic...... go down to 15%.......

If you don't notice a definite change then there's something drastically wrong..... perhaps with the gyro ?

Try the above and report back when you can....

Been there, done that and old enough to know better.....

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10-14-2013 11:42 PM  4 years agoPost 44
fly-45

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west des moines, iowa - usa

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JuanR
Tried changing the gain from 51% incremented up to 130% and nothing changed. The monitor indicates that it is in fact changing. So the gear channel is active. (check that off)

It is a new gyro.
Rechecked the single wire being connected on the signal pin and that is correct. I stopped and checked it again while I was typing this response, what saying sounds like the problem, but it is plugged in correctly.

It is a new gyro, but maybe it is bad, I have one more new that I can try, so maybe tomorrow I can that done.

Thanks Juan I appreciate your help

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10-15-2013 01:14 AM  4 years agoPost 45
JuanRodriguez

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The Villages, Florida

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No problem....

Just for grins, try changing that % rate down to 15 % to see if it has any effect......

Everything you've checked sounds good.... so, it could very well be the gyro itself.....

Been there, done that and old enough to know better.....

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10-15-2013 02:19 AM  4 years agoPost 46
es1co2bar3

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winnetka california

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Rechecked the single wire being connected on the signal pin and that
he need make sure the the single wire is connected to + positive
side of the RX and not inline with the black wire.
I cant believe your still having trouble I M sorry man I know the
frustration.

I was waiting on some honey but there aren't no Queen bee,

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10-15-2013 11:41 AM  4 years agoPost 47
JuanRodriguez

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The Villages, Florida

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he need make sure the the single wire is connected to + positive side of the RX and not inline with the black wire.
No, he needs to make sure the single wire is placed on the SIGNAL pin on the receiver, NOT the POSITIVE pin. The connector itself will not let you do that anyway.....

Read the above posts.... he has already checked and double checked...

Been there, done that and old enough to know better.....

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10-15-2013 11:44 AM  4 years agoPost 48
JuanRodriguez

rrProfessor

The Villages, Florida

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One thing that hasn't been discussed....
That is the way the gyro is mounted....

What type of mounting tape are you using ??

I would remove the gyro and re-mount it using new mounting tape....

Also, make sure your rudder trim and sub-trim is set to zero on the transmitter....

Been there, done that and old enough to know better.....

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10-15-2013 12:32 PM  4 years agoPost 49
fly-45

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west des moines, iowa - usa

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Mounted the same as always, double sided foam tape.

Will check the rudder trim and subtrim

Thanks JuanR

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10-16-2013 02:16 AM  4 years agoPost 50
fly-45

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west des moines, iowa - usa

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Juan R
You are two for two!!!

Finally had a chance to work with the heli tonight. Went down to 15% and I now tail control!!!

Amazing!! Thanks dude!!

I kinda like to know what happened. I've been flying this heli for a couple of years and always had the gain between 65 and 80%.
I thought below 50% was normal flight not HH? But I do have a solid red light on the gyro.
Any ideas why it now works at 15%? I've gone up to about 30% for now. Want to see where the tail wag starts. Will work with it again tomorrow.

Thanks again for your input.

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10-16-2013 01:02 PM  4 years agoPost 51
JuanRodriguez

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The Villages, Florida

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fly-45,
Glad to help and that you got things working OK....

Can't explain why the radical change vs your pre-crash settings but sometimes you have to try radical changes when diagnosing such problems....

In "theory", anything above zero on the HH side of the switch will be HH. That's why you're seeing that it worked and it's still in HH at such a low setting.

When you flip the switch to the "rate" mode, same thing applies. Anything from zero on will control the gain in the rate mode.....

Not all transmitters output that signal with 100 % accuracy. Just for grins, power your stuff up while in heading hold and start decreasing that percentage from where you now have it toward zero. Do this while you're watching the red light on the gyro. When the light starts to blink , you know you've reached true zero.....see what the percentage number is on your transmitter.....

You don't really need to do all that but it's just "out of curiosity" if you're so inclined....

Glad you got things working and that you had enough persistence to stick with it !

Been there, done that and old enough to know better.....

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10-16-2013 04:19 PM  4 years agoPost 52
fly-45

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west des moines, iowa - usa

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Juanr

Thanks again. It's about time to go fly again.

Get the gyro and Rx reseated, get the wiring collected and tied in.

I will try decreasing gain and see if it goes into rate/normal mode.

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HomeAircraftHelicopterMain Discussion › Tail rotor/slide issue
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