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T-REX 500 › about ready to quit (up dated please read)
04-28-2010 01:35 AM  8 years agoPost 1
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Some of the guys at my field fly the 3G and everything seems to go fine. Well set one up on my T-Rex 500, and just can't get the tail right (actually can't spool it up). Everything moves on the right side on the bench, then when I spool it up it turns on itself as if the rudder was inverted. Tried inverting it and same thing happens on spool up. My questions...do you guys set-up your rudder in normal mode or just go by the instructions, which has to have the rudder exactly centered on the output shaft and go fly?

Team Synergy, Rail blades, Team Scorpion, V-Team

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04-28-2010 01:43 AM  8 years agoPost 2
michael88997

rrElite Veteran

Lewisville,Tx

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ive had 2 3g's and they both worked... i dont exactly center the heli but i get it close... if your heli is doing fast piro in rate mode it might affect it

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04-28-2010 01:57 AM  8 years agoPost 3
iHover

rrVeteran

Berne , NY

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Id try doing the mechanical in rate mode and take it from thier.

You had me at Hover

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04-28-2010 02:28 AM  8 years agoPost 4
Melnic

rrElite Veteran

Columbia, MD,USA

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do the pinch test. If it does not pass that, something is reversed.
right stick and slider moves left (looking from the back of the heli).
http://www.mycoolheli.com/gyrobenchtest.html
It does not matter if you center it in rate mode, or set it to not drift in a hover in rate mode, tail should not spin violently when flying in HH mode.

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04-29-2010 01:37 AM  8 years agoPost 5
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Thanks, I did the pinch test, and blade rotation test and everything was fine. What else do you think it could be...my double sided tape?

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 01:41 AM  8 years agoPost 6
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Tried in normal mode and everything was OK. Changed to HH and the tail seems to only have a full right and full left position...what am I not getting?

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 02:22 AM  8 years agoPost 7
michael88997

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Lewisville,Tx

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You mean it's piroing to fast?

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05-02-2010 02:26 AM  8 years agoPost 8
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

My Posts: All  Forum  Topic

Exactly, and then can't seem to control it after.

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 02:30 AM  8 years agoPost 9
michael88997

rrElite Veteran

Lewisville,Tx

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Either turn ur ridden endpoints down or put some d/r in and it will slow it down and make it more controllable

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05-02-2010 02:32 AM  8 years agoPost 10
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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I turned the end points all the way down to 50 / 50 with no change in the tail reaction

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 02:38 AM  8 years agoPost 11
michael88997

rrElite Veteran

Lewisville,Tx

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The endpoints in the tx?

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05-02-2010 02:39 AM  8 years agoPost 12
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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That is right in the transmitter. I fly with a Futaba 10C

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 02:43 AM  8 years agoPost 13
michael88997

rrElite Veteran

Lewisville,Tx

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Well idk about futaba but maybe try d/r... I fly spektrum so maybe someone with futaba can let u know how to slow down the servo cause on spektrum that's what does it

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05-02-2010 04:06 AM  8 years agoPost 14
Fnity

rrKey Veteran

Socal - Lafayette, IN

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Elite Veteran LOL

Frank Leyva
Rave, Next-D, Radix
Scorpion Power Systems
GensACE

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05-02-2010 05:19 AM  8 years agoPost 15
Funknrock

rrApprentice

San Marcos, CA

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Is there a gyro reverse setting on the 3G setup? Only time I'ver ever had out of control spin is when the gyro senser is reversed. It's compensating in the wrong direction and just keeps spining. Took me a while to learn that the reverse switch doesn't revers the servo, it reverses the gyro sensor.

Hope that helps! Been thinking of getting the 3G for my 500 too.

My crashes are cooler than your flying! ;^)

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05-02-2010 05:44 AM  8 years agoPost 16
TMoore

rrMaster

Cookeville, TN

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There is something else wrong here. None of this is making sense to me. If this is what I'm reading, we have a gyro that works in rate mode but then when it switched to HH mode it spins in one direction or another.

The 3G basically uses a 780 tail gyro for tail control. When I set up one of these systems, it is simply a matter of setting the endpoints for the tail servo in the 3G, setting the correct direction of control at the gyro and then making sure that the mechanical tail trim is setup in rate mode so it doesn't drift. Once this is done, you can switch to HH mode and set the piro rate with the TX endpoint settings.

Is this what was done?

TM

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AMA SECTION 336 = Good
Drones = EVIL

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05-02-2010 12:38 PM  8 years agoPost 17
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

My Posts: All  Forum  Topic

TMoore, yes this is exactly what was done, but not a first. At first tried as they say in the book, everything was OK on the bench, but not when I spooled up, tried reversing the rudder and sensor both in the radio and on the 3G module nothing worked. Then set it as is should be on the bench lifted off in rate mode fixed the drift, then switched back to HH and the same out of control tail situation happened. Do you think I have a problem with the 3G module. I'll let you know. Luckly I bought it from my LHS and he gave me another to try.

Team Synergy, Rail blades, Team Scorpion, V-Team

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05-02-2010 01:54 PM  8 years agoPost 18
Fnity

rrKey Veteran

Socal - Lafayette, IN

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**tried reversing the rudder and sensor both in the radio and on the 3G module nothing worked

Gyro set-up 101, its not the 3G or electronics, its you steffgiguere

Frank Leyva
Rave, Next-D, Radix
Scorpion Power Systems
GensACE

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05-02-2010 03:28 PM  8 years agoPost 19
TMoore

rrMaster

Cookeville, TN

My Posts: All  Forum  Topic

TMoore, yes this is exactly what was done, but not a first. At first tried as they say in the book, everything was OK on the bench, but not when I spooled up, tried reversing the rudder and sensor both in the radio and on the 3G module nothing worked. Then set it as is should be on the bench lifted off in rate mode fixed the drift, then switched back to HH and the same out of control tail situation happened. Do you think I have a problem with the 3G module. I'll let you know. Luckly I bought it from my LHS and he gave me another to try.
If the 3G works in rate mode, barring an issue with the 3G, I would start looking at my TX programming to see what is happening in the TX like maybe a bunch of expo that is turned on when you hit the HH switch. I would also look at what happens to the gyro gain channel when the HH switch is enabled.

TM

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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05-03-2010 09:43 PM  8 years agoPost 20
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

My Posts: All  Forum  Topic

Thanks Fnity, therefore you saying its' either the module or the sensor?

Team Synergy, Rail blades, Team Scorpion, V-Team

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