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T-REX 450 › 450SA Tail Wag
03-06-2008 10:00 PM  10 years agoPost 1
grock

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Israel

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Hey,
I have a new T-Rex 450SA.. I had a problem with the one way bearing on the main gear an I replaced it to the new V2 Gear. Everything is good now.

Other problem I'm fighting with is a consistent tail wag. At first I thought it was the gyro(had Telebee) but I replaced it to CSM 560 and Futaba GY401, still wags.

So I changed the servo(Had standard Esky 9g servo), now have Robbe FS61BB.. very fast servo. wag gets better and slower.

now I have a slow wag from side to side.. it's not a gyro gain problem as I get this wag on all ATV gain channel (I have DX6).

Belt tension is good. I have a z-bend tail rod connected to the shortest hole on the servo arm to earn more gain.
Everything is lubed and new.

What should I check?...

Thanks,
Gil.

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03-06-2008 11:43 PM  10 years agoPost 2
vidmarv

rrApprentice

ft walton beach, FL

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Metal Tail Gear?
Mine went away with a metal tail gear.

Just saying.

VM

Perfectly sliced air every time!

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03-07-2008 12:30 AM  10 years agoPost 3
payne1967

rrElite Veteran

uk

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check the tail system is free to move
check the tail blade holder bearings
also check that the tail drive pulley is not slipping on the shaft and the pulley at the tail gear box end
make sure your tail output shaft isn't bent and your tail bades are equally tightend
this sound like a mechanical problem that a gyro/servo fault

dave

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03-07-2008 01:15 AM  10 years agoPost 4
Blade_Master1

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Canada

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I would agree that it is mechanical.
change the z bend to a ball to rule it out.
I don't like z-bends anyway they wear out the horn IMO
I would check that the tail isn't binding also try a higher head speed
see if it helps

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03-07-2008 01:30 AM  10 years agoPost 5
electricdurango

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Sterling, VA

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Are you running a 401 now? if you are can you take pics of your servo horn setup/gyro settings/ tail box etc. I can help.

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03-07-2008 05:25 AM  10 years agoPost 6
grock

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Israel

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Now I have the CSM SL560.. closest hole on servo arm. tried all gains.. so it's not a gyro/servo setup for sure.

I will check for slops and bent shaft. the tail pulley seems to be fine

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03-07-2008 01:04 PM  10 years agoPost 7
Gary H

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Minnesota USA

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Try the far hole from center, maybe your gyro is seeking!!! Had it done it> More throw.

Gary

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03-07-2008 02:14 PM  10 years agoPost 8
grock

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Israel

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Try the far hole from center, maybe your gyro is seeking!!! Had it done it> More throw.
Already tried that.. same thing happens.

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03-07-2008 05:01 PM  10 years agoPost 9
electricdurango

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Sterling, VA

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Is your tail gear/pully closest to main gear have notchy bearings? This is a major known cause of electrical interferance.

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03-07-2008 07:44 PM  10 years agoPost 10
ADRYAN

rrKey Veteran

Stouffville, Ontario, Canada

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replace the metal tail rod to 4 mm carbon fiber... works for me...

DYNAX/OS91 : 9303/S649pcm : GY601/9251 : CSMRL10/9253 : 7.4vLipo/Regulator : KO2123s(ai/el/pi)

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03-07-2008 07:56 PM  10 years agoPost 11
TomRex

rrElite Veteran

West Palm Beach Join Date: 12-28-2005

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replace the metal tail rod to 4 mm carbon fiber

too bad,,,,,,,,

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact

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03-07-2008 07:58 PM  10 years agoPost 12
gravydrive

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Jacksonville, FL

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Absolutely. Whip up a carbon rod for that thing.

Pick up a carbon fiber tub with an inside diameter of .125":

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJDP7

Cut the CF rod to length, then cut the ends off your metal rod and epoxy them into the tube. Make sure everything is positioned correctly before allowing the epoxy to set. After this, remove all the linkage guides and install the new rod.

Murphy's Law Denier

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03-07-2008 09:13 PM  10 years agoPost 13
grock

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Israel

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Cut the CF rod to length, then cut the ends off your metal rod and epoxy them into the tube. Make sure everything is positioned correctly before allowing the epoxy to set. After this, remove all the linkage guides and install the new rod.
Do you have a picture of this?

Also, I know this things might work, but it seems weird that a new heli will suffer from tail wag because of mechanical problem, unless I'm missing something..

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03-07-2008 09:40 PM  10 years agoPost 14
vrwired

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Boulder County, CO

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Check the teeth on your belt.. make sure there all there!
Just another thought.

Also chack your delay settings... fast digital servo on the 401 should be set at 0 delay.

I would guess you tried lowering your gain? (obvious) but you never know!

JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D

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03-07-2008 10:38 PM  10 years agoPost 15
ADRYAN

rrKey Veteran

Stouffville, Ontario, Canada

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hope this helps... should be the same for both ends...

A

.

DYNAX/OS91 : 9303/S649pcm : GY601/9251 : CSMRL10/9253 : 7.4vLipo/Regulator : KO2123s(ai/el/pi)

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03-07-2008 10:57 PM  10 years agoPost 16
gravydrive

rrApprentice

Jacksonville, FL

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Interesting take, drilling the extra hole in the CF rod. I have mine like that, but without the hole, just epoxied and have had 0 problems. I also left substantially more metal rod for more gluing area and really laid the epoxy on thick.

Murphy's Law Denier

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03-07-2008 11:14 PM  10 years agoPost 17
ADRYAN

rrKey Veteran

Stouffville, Ontario, Canada

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Some plankers with big scale birds taught me that. He said that's how they set it up for their control surfaces... a bit of insurance I guess. But with my X-Cell tail control rod, MA provides a longer threaded rod and the rod screws onto the Carbon Fiber along with the linkage... most of our guys have dumped their stock Align rods(even the Align CF rod) and went with the improvised 4 mil CF rod.

a

.

DYNAX/OS91 : 9303/S649pcm : GY601/9251 : CSMRL10/9253 : 7.4vLipo/Regulator : KO2123s(ai/el/pi)

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03-07-2008 11:34 PM  10 years agoPost 18
Daltuch

rrNovice

Seattle WA

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I bought some cheap ebay batteries and they weren't quite strong enough for my Rex I could fly around and stuff but I had a constant tail wag while using them so it could be your battery is not putting out enough power.

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03-08-2008 07:05 AM  10 years agoPost 19
outhouse

rrVeteran

auburn ca

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95% of wag is a vibration issue.

out of balance blades, main and tail and flybar
main gear old and or pinion gear old
belt missing teeth and or cords busted inside the belt.
sometimes bad metal belt gears have been reported.
belt tension.
servo gears broken.
linkage to loose.
worn main and or tail bearings.
bent main feathering or tail shaft.

take of all blades spin it up with the tail servo off. [feel frame for vibrations] spin it up and make sure everything runs clean, add tail blades same thing make sure it spins up clean. pinpoint that its mechanicaly sound then plug the servo back in and hold gyro in your hand to see if isolating vibration will stop wagging. [be careful not to run the tail blades into yourself] new or different gyro tape softer/harder for fine tuning. then retune gyro from the ground up.

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03-08-2008 08:10 AM  10 years agoPost 20
grock

rrApprentice

Israel

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outhouse - Great info, I'll check it out tomorrow.
I bought some cheap ebay batteries and they weren't quite strong enough for my Rex I could fly around and stuff but I had a constant tail wag while using them so it could be your battery is not putting out enough power.
I have Hextronix 2200mah 20c I think it's enough for the rex.

Thanks for the info guys. I'll check all tomorrow and let you know.

Thanks,
Gil.

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