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T-REX 550 › Tail Vibration Issue
08-29-2012 01:57 PM  5 years agoPost 21
HeliNutAndy

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worcester, MA USA

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I have not had a chance to set the gain. Hopefully after I get out of work tonight I have the time. I did take some pictures of the tail just in case you gentlemen see something out of the ordinary. Thx again for the help. I tried to contact some local guys to take a quick look from this site but they blew me off. The vibration is not constant it only appears to manifest itself when I am applying a large amount of right or left tail rudder.

I had another question as well. My main gear is slightly warped. Is this normal since it is a plastic gear? I'm guessing the manufacturing process is not the best when pertaining to building these gears.

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08-29-2012 02:14 PM  5 years agoPost 22
VANHELI

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Omaha,Nebraska

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The warped main gear is fairly common. Pure luck if you get a perfect one.

I have not read this entire thread so not sure what you have tried so far...I know on my 550 and others around here there is a vibration in the tail on spool up. It goes away when in flight and has never caused any issues for hundreds of flights.

You might want to double check your tail rotor and make sure it is perpindicular to the main rotor. For atleast two of them here the tail rotor was pointing slightly downward. We simply grinded the nub on the tail case retainer(the plastic piece between the fin and tail case), only enough to allow it to rotate to true 90 deg. and it still keeps the the tail case "pinned".

Good luck.

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08-30-2012 04:56 AM  5 years agoPost 23
RICHW

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Cupertino, CA

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are you overtightening the blades (main and tail)?

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08-30-2012 05:18 AM  5 years agoPost 24
Stephen Born

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USA

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I may have missed this because i just jumped right into the subject
I have not read this entire thread so not sure what you have tried so far
As HeliNutAndy is trying to figure out what is going on with his heli, many of you have not taken the time to read what is actually going on or taking place.

Please, before giving opinions to a noob and causing him to be overwhelmed with info, take time to read the entire thread and understand what is being said by him and others.

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08-30-2012 06:31 AM  5 years agoPost 25
honda411

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Surprise, AZ USA

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There you go, jumping into stuff without a clue.
Easy nerd lol
As HeliNutAndy is trying to figure out what is going on with his heli, many of you have not taken the time to read what is actually going on or taking place.
Please, before giving opinions to a noob and causing him to be overwhelmed with info, take time to read the entire thread and understand what is being said by him and others.
Its an idea. Its a possibility that could cause his problem. Not saying it is or isnt but worth checking. I dont see why not or why its a problem to check

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades

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08-30-2012 06:43 AM  5 years agoPost 26
honda411

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Surprise, AZ USA

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Okay first like mentioned above and before, the ground resonance could do it and i do hear negative in the blades while this is happening. Bring it up like mentioned and try it. Even light on the skids.

Make sure your 90 degree setup is good(servo setup, bellcrank, etc)

Make sure those tail links werent tightened too much and no loctite got into them. Those plastic links.

Check to make sure the inner race of the slider isnt loose or binding and bearings are good. Normally this is something you can tighten and loosen.

No loctite accidentally got into the thrust bearings/blade grip bearings.

Your main blades arent too tight, but not too loose.
Same with tails.

Here is just some stuff to think about for now. I wont get into it too far yet.

HeliDirect Field Rep, Synergy N7 w/ OS 105, Torq Servos, Cyclone/ Rail blades

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08-30-2012 11:15 AM  5 years agoPost 27
mrloudly

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Naseby Northampton England

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My 550 was transitioning through a tail fin vibe on spool up. I added another torque tube bearing which did help slightly. (Re-positioned to 1/3 1/3 1/3) Fly's fine so I'm not too bothered...

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08-30-2012 03:23 PM  5 years agoPost 28
VANHELI

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Omaha,Nebraska

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edit

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08-31-2012 03:31 AM  5 years agoPost 29
theriddick45

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United States

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+1 for a too high tail gain. Also you need to hover and see if it does it at hover. I will never spool and stay on the ground much time on a FBL Heli ground resonance will affect the gyro. Spool it up and check.

Hope this help!!!

Suzi Janis 800e & 700e 3blade both w/Ikon

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08-31-2012 07:45 AM  5 years agoPost 30
Wynn1427

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Ca. 93612

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Just a another thing to check. I know in the 3gx PC Software you can actually see what values you are getting in the tail gain. Can anyone confirm that the 3g PC software has a similar screen to see the current tail gain (never setup or flown a 3g)? Had a similar tail issue with a 3gx setup until I assigned the right channel for the tail gain in my gyro menu on a DX8.

Wynn

Logo 550sx

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08-31-2012 03:48 PM  5 years agoPost 31
drdrums

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Beaverton, Oregn

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Switch the tail gyro to rate mode... That will tell you if it's the gain or something else... I usually use rate mode anyway to mechanically set up the tail before dialing in the gain in HH.

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08-31-2012 04:22 PM  5 years agoPost 32
Solmanbandit

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Tucson , AZ

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Hey guys, you all have posted 9 times without him posting. You are overwhelming him with info.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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08-31-2012 04:24 PM  5 years agoPost 33
HeliNutAndy

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worcester, MA USA

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I apologize for the slow response. My wife had knee surgery this week and I have been helping her get around etc...

I am confused regarding the Gyro setup and my radio. I am pretty sure it is setup incorrectly because of my lack of understanding on the subject. I am using a DX7S radio to control the heli. The 3G rudder is connected to channel 5(Gear) of my receiver. When I look at the Gear function in my TX it is set to 'inhibit'. Do I set this function to Gyro? If so I get an additional menu that allows me to set rate for POS 0, POS 1, and POS 2. What settings should the rate use? If anyone could please tell me how to set this up and what switches I would need to use it would great be appreciated. I tried to read up on the subject but I am still a bit confused. Thank you for your help.

Andy

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08-31-2012 04:48 PM  5 years agoPost 34
Stephen Born

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USA

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I am using a DX7S radio to control the heli.
This is the newest DX radio. You will be pleased with its performance.
When I look at the Gear function in my TX it is set to 'inhibit'. Do I set this function to Gyro?
Yes
If so I get an additional menu that allows me to set rate for POS 0, POS 1, and POS 2. What settings should the rate use?
The DX7s is a bit different than the DX7, DX6i, and DX7se. The DX7s rate function follows the Futaba Tx format. This means you should be at the menu where you see +0 - +100. (positive) Put the POS 0 at around 40, POS 2 at 50, and POS 3 at 60. Do not use the -0 - -100 function. (negative) The gyro will not like this...or your heli.

Take off at POS 0. If you have shakes, flip to POS 2. If still shaking, flip POS 3. Which ever position the heli is most stable, manipulate THAT number to get the best flying performance.

When flipping POS, keep a watchful eye on the heli, as significant changes can occur.

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08-31-2012 04:51 PM  5 years agoPost 35
HeliNutAndy

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worcester, MA USA

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Awesome. Thank you very much.

Andy

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08-31-2012 04:54 PM  5 years agoPost 36
HeliNutAndy

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worcester, MA USA

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AerialSkyCam after creating these settings do I have to set the 3G up again?

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08-31-2012 04:59 PM  5 years agoPost 37
Stephen Born

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USA

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AerialSkyCam after creating these settings do I have to set the 3G up again?
I cannot and will not answer this question, as I do not fly the 3G unit.

I am sure other pilots who are familiar with the 3G can answer that.

Sorry.

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08-31-2012 06:43 PM  5 years agoPost 38
HeliNutAndy

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worcester, MA USA

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Wouldn't a setting below 50 put the gyro in rate mode and one above 50 place it in head holding?

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08-31-2012 06:48 PM  5 years agoPost 39
Stephen Born

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USA

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Wouldn't a setting below 50 put the gyro in rate mode and one above 50 place it in head holding?
On the DX7s +0 - +100 is heading hold and -0 - -100 is rate mode.

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09-01-2012 08:34 AM  5 years agoPost 40
drdrums

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Beaverton, Oregn

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Rate mode won't hurt your tail gyro (built into the 3G), or your heli. It may, depending on how accurately your tail is mechanically set up, cause a slow piro one direction or the other. This is what I use rate mode for - dialing in the mechanical center of my tail, so the gyro has less work to do in HH mode. This is done by adjusting the tail control rod length. You're good when you can lift off in rate mode with little to no tail drift.

If you're not prepared to counteract a slow piro on liftoff, then yes, avoid rate mode, and find someone more experienced to set up your tail.

Otherwise, I use one gain setting for all flight modes. Usually I see multiple gains run with the gain change coupled to the flight mode switch (so going from IU1 to IU2 changes gain). YMMV.

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T-REX 550 › Tail Vibration Issue
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