RE: 2006 Colco LYNX 380XL 6CH RC Helicopter

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter
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RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 5/30/2007 6:53:40 AM

J. Hartikka

Posts: 12
Joined: 11/23/2006
From: EU, FINLAND
Status: offline

quote:

ORIGINAL: Psionic001

Hi Juha,

Which one is the pitch reverse? Top left or right.

The reverse switches that may cause contact problems are on the lower right corner of the TX, see photo. Check function by observing that it has reversing effect to the wished channel - sometimes Chinese transmitters may have faulty channel markings.

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_____________________________

- Juha -

(in reply to Psionic001)

Post #: 126

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 5/30/2007 6:56:06 AM

J. Hartikka

Posts: 12
Joined: 11/23/2006
From: EU, FINLAND
Status: offline

(sri, double msg...)

_____________________________

- Juha -

(in reply to J. Hartikka)

Post #: 127

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 5/30/2007 7:24:15 AM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Thanks for that image Juha.

best

Psi

quote:

ORIGINAL: J. Hartikka

The reverse switches that may cause contact problems are on the lower right corner of the TX, see photo. Check function by observing that it has reversing effect to the wished channel - sometimes Chinese transmitters may have faulty channel markings.

(in reply to J. Hartikka)

Post #: 128

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/4/2007 9:34:40 AM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Hi,

had a bit of a test run (broke things too) after cycling all of the switches and it seems to have fixed most of the errors I was seeing.

I still have one major issue described below.

I moved the 2 rear servo linkages in by 1 to the inner most holes but I still get positive pitch when I bring the stick back and negative when I move the stick forward. It looks like this is because the front servo arm travels up lots but has very little down travel.

Has anyone got any suggetsions on where to go next with this issue.

Oh, and where do I buy spare parts. The ebay place (RVM Shop) seems not to be trading.

thanks

Psi

(in reply to Psionic001)

Post #: 129

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/6/2007 1:59:18 PM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Hi Juha,

I need your expert advice on electronic mods...

As noted in my previous post, the front servo moves in one direction more than the other. about 85:15. I believe the servo should move 50:50 either direction.
When I use the reverse switch, the situation is reversed ie 15:85.

Is there anything you can recommend as a mod to the TX that might fix this? If I switch the elevator and throttle pots possibly?

Thanks

Psi

quote:

ORIGINAL: J. Hartikka

The reverse switches that may cause contact problems are on the lower right corner of the TX, see photo. Check function by observing that it has reversing effect to the wished channel - sometimes Chinese transmitters may have faulty channel markings.

(in reply to J. Hartikka)

Post #: 130

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/7/2007 8:37:03 AM

J. Hartikka

Posts: 12
Joined: 11/23/2006
From: EU, FINLAND
Status: offline

Yes, the servos should be about at their middle position when the pitch/power stick is set for null blade angle. The servos should be about at their middle travel when you switch the 3D switch on (first disconnect motor connectors when testing these!) and position the pitch/power stick at its middle.

The error may be either improper hub linkage setting, or TX center trim fault - to decide which, you may need to study heli blade angle linkage adjustment. If necessary, set servo horns and screw link ends to correct positions.

If it appears to be the TX pitch/power faulty center trim that makes the trouble, you may rescale the pot center by adding a scaling resistor or trimmer (try correct value, usually about 1 ... 5 kohm) to one pot end pin (again try which of the two). An oscilloscope would show straight if there is a problem with the TX pitch/power channel pulse widths (usually abt. 0.8 ... 1.4 mS), if you happen to have access to one.

Another way to correct the pot center is to turn the pot axle in its retainer, if the TX allows it. You have to partly take apart the stick assembly to do this, however. Helis usually demand learning maintenance skills to keep flying, whether they are small or large..!

- Juha -

quote:

ORIGINAL: Psionic001

Hi Juha,

I need your expert advice on electronic mods...

As noted in my previous post, the front servo moves in one direction more than the other. about 85:15. I believe the servo should move 50:50 either direction.
When I use the reverse switch, the situation is reversed ie 15:85.

Is there anything you can recommend as a mod to the TX that might fix this? If I switch the elevator and throttle pots possibly?

Thanks

Psi

quote:

ORIGINAL: J. Hartikka

The reverse switches that may cause contact problems are on the lower right corner of the TX, see photo. Check function by observing that it has reversing effect to the wished channel - sometimes Chinese transmitters may have faulty channel markings.

_____________________________

- Juha -

(in reply to Psionic001)

Post #: 131

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/7/2007 9:16:36 AM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Hi Juha,

I think I'll try your last idea. It should be easy to pull the stick/pot assembly apart, then give it a bit of a twist and re-insert it.

Thanks again for your help. I'll let you know how I go.

Psi

quote:

ORIGINAL: J. Hartikka

Yes, the servos should be about at their middle position when the pitch/power stick is set for null blade angle. The servos should be about at their middle travel when you switch the 3D switch on (first disconnect motor connectors when testing these!) and position the pitch/power stick at its middle.

The error may be either improper hub linkage setting, or TX center trim fault - to decide which, you may need to study heli blade angle linkage adjustment. If necessary, set servo horns and screw link ends to correct positions.

If it appears to be the TX pitch/power faulty center trim that makes the trouble, you may rescale the pot center by adding a scaling resistor or trimmer (try correct value, usually about 1 ... 5 kohm) to one pot end pin (again try which of the two). An oscilloscope would show straight if there is a problem with the TX pitch/power channel pulse widths (usually abt. 0.8 ... 1.4 mS), if you happen to have access to one.

Another way to correct the pot center is to turn the pot axle in its retainer, if the TX allows it. You have to partly take apart the stick assembly to do this, however. Helis usually demand learning maintenance skills to keep flying, whether they are small or large..!

- Juha -

(in reply to J. Hartikka)

Post #: 132

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/7/2007 12:56:01 PM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Hi again,

I have pulled the Tx apart and had a go at what you have suggested. It mostly worked.

I believe there are a combination of 2 problems as you sugggested. Firstly the servo does not move enough from end-to-end travel. Second the pot was also not centered.

I pulled the pot out. It has a little locator tab, so I had to dermel to the side of where the tab sits in order to rotate the hub slightly (I could have cut the tab off). I rotated it about 5° in the appropriate direction after experimenting a bit. Servo is now centered and moving equidistant. For 80% of the stick travel, this set-up will now work and provide normal flight. After about 80% of stick travel in each direction though, the front servo stops moving whilst the rear two keep traveling. This is the major cause of the negative pitch on forward stick and positive pitch on back stick.

I think I'll just limit my stick movements from here on. I could optionally reduce the throw of the rear servos further by following your electronic wizardry, but it's too much trouble for this crappy little machine.

When this one dies, I'm moving to a better ship, maybe a Thunder Tiger Titan Mini.

best

Psi

quote:

ORIGINAL: J. Hartikka

The error may be either improper hub linkage setting, or TX center trim fault - to decide which, you may need to study heli blade angle linkage adjustment. If necessary, set servo horns and screw link ends to correct positions.

Another way to correct the pot center is to turn the pot axle in its retainer, if the TX allows it. You have to partly take apart the stick assembly to do this, however. Helis usually demand learning maintenance skills to keep flying, whether they are small or large..!

- Juha -

(in reply to J. Hartikka)

Post #: 133

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/8/2007 4:12:02 PM

nik63

Posts: 4
Joined: 6/8/2007
From: , MALAYSIA
Status: offline

Hi

I just got Lynx 380. I having problem with my Lynx. The moment l increase the throttle, the tail rotor start to spin first, then only the main rotor. It make the heli spin.

How can I adjust it.

tq

(in reply to The1 2 thrust)

Post #: 134

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/9/2007 8:16:43 AM

J. Hartikka

Posts: 12
Joined: 11/23/2006
From: EU, FINLAND
Status: offline

Hi Psionic,

Nice to know that you got it work at least partially - congratulations for solving a problem! Heli flying is mostly adjusting, adjusting, adjusting, and a bit flying between them...

When moving to more advanced and complex helis, you may find that trimming experiences with this small one probably help. Lynx is trimmed rather similarly than those big ones, to which just the hub costs more than this little heli does complete with controls, so it pays to practise trimming with this. On the other hand, big heli TX's can be computer style programmed instead of soldering or drilling, but even then you have to first understand what to do, and all this setup will train a heli pilot to solve these heli trim puzzles.

I guess that too your long travel of the pitch control may be the same problem that made me to solder limiting resistors to each end of the TX pot to reduce the travel to about 80 %.

quote:

ORIGINAL: nik63

Hi

I just got Lynx 380. I having problem with my Lynx. The moment l increase the throttle, the tail rotor start to spin first, then only the main rotor. It make the heli spin.

How can I adjust it.

tq

Hi Nik,

If the tail rotor seems to otherways follow well the throttle stick movement, it seems a plain TX tail center trim problem. I suppose the tail trim travel in your transmitter is not sufficient.

I had to adjust the tail trim, too, in my TX. I made it similar way as I described for the TX pitch pot adjustment above, by soldering a scaling trimmer (abt. 5 kohm) to one end pin of the TX tail potentiometer (try which end), then adjusting for center trim. Another possibility is to center the TX tail pot axle mechanically, as Psionic described above.

Please remark, that both pitch trims on the upper corners of the TX affect tail trim, too! So take this in account when setting the tail center trim - you may have to iterate a few times for correct tail and pitch TX center trim settings. Anyway, all these are part of basic heli trimming skills if you once decide to move to more complex helis!

_____________________________

- Juha -

(in reply to nik63)

Post #: 135

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/9/2007 8:34:00 AM

Psionic001

Posts: 37
Joined: 6/21/2006
From: Sydney, AUSTRALIA
Status: offline

Hi Juha,

I usually use my Futaba 9zap for aeroplanes, so I'm looking forward to upgrading to a T-Rex or TitanMini and using a real Tx.

If I can limit the travel of the rear servos, I believe the problems will be 100% fixed.

thanks again,

Psi

quote:

ORIGINAL: J. Hartikka

Hi Psionic,

Nice to know that you got it work at least partially - congratulations for solving a problem! Heli flying is mostly adjusting, adjusting, adjusting, and a bit flying between them...

When moving to more advanced and complex helis, you may find that trimming experiences with this small one probably help. Lynx is trimmed rather similarly than those big ones, to which just the hub costs more than this little heli does complete with controls, so it pays to practise trimming with this. On the other hand, big heli TX's can be computer style programmed instead of soldering or drilling, but even then you have to first understand what to do, and all this setup will train a heli pilot to solve these heli trim puzzles.

I guess that too your long travel of the pitch control may be the same problem that made me to solder limiting resistors to each end of the TX pot to reduce the travel to about 80 %.

(in reply to J. Hartikka)

Post #: 136

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/9/2007 8:50:28 AM

J. Hartikka

Posts: 12
Joined: 11/23/2006
From: EU, FINLAND
Status: offline

A good thing about these Colcos is that they usually work with standard 35 MHz FM transmitters. So you can very well set a Lynx up for any CCPM mix TX. With a Futaba the settings should be much easier!

_____________________________

- Juha -

(in reply to Psionic001)

Post #: 137

RE: 2006 Colco LYNX 380XL 6CH RC Helicopter - 6/25/2007 6:51:30 PM

limmin

Posts: 6
Joined: 6/14/2007
From: Johor, MALAYSIA
Status: offline

Hi everyone,

I am a newbie. Just got my Colco Lynx 380XL. Till now I am still having problem lifting up the heli of the ground. Whenever I lift it up, i will skew to the left, I have been adjusting and trimming it and it is still the same. Untill one day, I lift up the heli and it crashed. It had quite a damage. The main rotor holder is damaged and also the tail rotor set. I am still looking for the replacement unit.

I am just wondering, why sometimes, when i power up the helis like the way Lostman suggested, sometimes it works like normal and there is time when then throttle is not working. When i push up the throttle, the motor is not running, and the servos react a bit. And the gyro is bl