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T-REX 500 › 500 tail wag
08-10-2009 04:19 AM  8 years agoPost 21
outhouse

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auburn ca

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bud you said the key words yourself

"pulled the gyro from the heli completely and mounted it to the bench (lol). when i spooled up this time to half throttle, the tail servo was completely still and didnt act all crazy"

sounds like your having some vibration issues

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08-10-2009 05:01 AM  8 years agoPost 22
az_heliguy

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San Tan Valley, AZ

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yeah yeah, i know, lol...

no vibration issues though, gotta keep in mind too that that also isolated the gyro from esi (electr-static interference). so now i have the 401 installed again, but i spooled up and checked to static build up and holy sh!t i could probably light a 40w bulb, lol... so i did some anti-static spray on the belt and gears, but had to come in for a bit to help wrangle the kids to bed, crap... i should have probably made the kids be in the shop working on this stuff, hahaha...

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08-10-2009 05:47 AM  8 years agoPost 23
az_heliguy

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San Tan Valley, AZ

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still no good, so im out of ideas now, lol... time to put in a tt tail, lol... so i think she is gonna sit on the shelf for a few days till i can get that taken care of

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08-10-2009 05:47 AM  8 years agoPost 24
504Rone

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New Orleans, LA.

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I'm having the same problem se tail setup. I was able to get it to stop while one inner hole but I could not get full travel in both directions on the tail slider so I put it back in the middle. I'll try to work it out tomorrow. Weird thing is at 81 wag 82 no wag 83 wag again?? Now it's in middle hole with wag but holds great. It got dark so I left it alone.

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08-10-2009 05:51 AM  8 years agoPost 25
outhouse

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auburn ca

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your scale on vibrations and the gyros are two different things.

spin the heli up without blades to 100 flat ill bet if the gyro is still on the table and not on the heli you have vibes.

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08-10-2009 05:58 AM  8 years agoPost 26
az_heliguy

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San Tan Valley, AZ

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must be a very small vibration then, because on my knight 3d i spooled up once after a wreck and forgot to change my main shaft and had one heck of a vibration and the 401 on that at the time still help the tail... but oh well... ill pull the head this week sometime this week and re-balance the head with the blades on and replace the spindle and main shaft... like i said, at this point im grabbing at straws

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08-10-2009 06:32 AM  8 years agoPost 27
smartguy

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Corona, CA

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maybe you have the gyro and pitch mix on in your radio.

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08-10-2009 06:35 AM  8 years agoPost 28
az_heliguy

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San Tan Valley, AZ

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maybe you have the gyro and pitch mix on in your radio.
okay "smartguy", lol... you know, i setup a new model in my 9303, perhaps i should check for any mixes, although im sure there are none, because on the bench, the tail doesnt move with collective input

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08-10-2009 06:52 AM  8 years agoPost 29
outhouse

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auburn ca

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i woudl not think a complete head balance is needed.

im thinking more along the lines of

bearings in general and worn motor bearings. tail rotor area

there has to be a reason that the gyro on a table holds everything still.

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08-10-2009 07:51 AM  8 years agoPost 30
az_heliguy

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San Tan Valley, AZ

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oh, i know there is a reason, but keep in mind that this is a BRAND NEW KIT, not one that i have been flying for a few months now and then this started happening, lol...

i just got finished swapping out everything from the boom clamps on the frame to the tail case, so everything there is replaced. i guess tomorrow ill work on the main gears, main shaft and spindle (ill also re-balance the head).

my reason for pulling the gyro from the actual heli was to also check for static interference because most static discharge pretty much disapates right after it reaches the surface. i know the gyro and servo are good, so after tomorrow when i can get the gears and shafts replaced, at that point it has to be some kind of interference of some sorts. im not gonna give up on it though (although i would like to at this point, lol)...

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08-10-2009 09:11 AM  8 years agoPost 31
Skarn

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Pasadena, MD

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Ok, let's back up.

You say no matter what gain, nothing changes.

So what channel do you have the gyro gain wire plugged in to? What menu are you using? (Gyro sense or gear endpoints).

What radio? You menion a 9303 but you also said you are on 72mhz....

Skarn

It's better to burn out than to fade away...

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08-10-2009 02:11 PM  8 years agoPost 32
Gary H

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Minnesota USA

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outhouse, in the linear you will get more head speed, I first set up in a regular pitch curve and had a real bad tail wag, could not get rid of it tell someone told me to set up in linear mode, never heard of souch a thing, but went ahead and tryed it, bingo all problems were gone, now no more issues, flys great!!
Now have converted to Nitro better yet, I am done with these electric issues!!

Gary H

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08-10-2009 06:30 PM  8 years agoPost 33
smartguy

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Corona, CA

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if you are using the 9303 radio, the gyro gain is on the gear travel adjustments.

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08-10-2009 08:34 PM  8 years agoPost 34
504Rone

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New Orleans, LA.

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I was able to get the wag out. My tail pitch slider was too tight. Now I just need to eliminate the bounce.

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08-10-2009 09:23 PM  8 years agoPost 35
Ben-T-Spindle

rrProfessor

Central Illinois

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I was able to get the wag out. My tail pitch slider was too tight. Now I just need to eliminate the bounce.
That’s exactly what happened to me with a new helicopter. Some of those new tail sliders just won’t work out of the box.

Bounce – higher headspeed or softer (gray) dampers. I have found that various blades require different minimum headspeeds. I have one set of blades that will hover smoothly at about 2000 headspeed and another set that takes about 2200.

... BTS

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08-10-2009 09:38 PM  8 years agoPost 36
504Rone

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New Orleans, LA.

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I have about 60 flights on mine already. I just changed to a GP750 and 9257 on the tail from a 401 and 9257. I forgot I had made some adjustments after my last flight with the 401. I actually ran my battery too low while test flying and I noticed that as the headspeed dropped the bounce went away. I've had bounce before on my 450 and the problem was always solved by decreasing the gain. I think I have the gain right where I wont it because when I punch it in normal mode the tail doesn't move a inch! Anybody have any experience with the delay setting on the GP750. I have the same setup on my sport and its perfect!

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08-11-2009 06:01 AM  8 years agoPost 37
az_heliguy

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San Tan Valley, AZ

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i have the gain for the gyro plugged into the gear channel and can adjust the gain on the radio for normal, id1 and id2. i did notice today that the main gear assembly seems sloppy, so im gonna put in a new main gear, hub and one way bearing and see what happens. im almost to the point with gary h though, i knew there was a reason i didnt get an electric way before this, lol... never had an issue with any nitor heli ive had

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08-11-2009 07:54 AM  8 years agoPost 38
az_heliguy

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San Tan Valley, AZ

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okay... now i feel like a dumb a$$, lol...

smartguy - you were right!!!

i checked and i had the gain plugged into the gear and not aux 2... i swapped it over and POW!!! works like a charm...

thanks everyone for your input though. i was starting to lose faith in this whole electric heli business, but apparently i should be losing faith in myself, hahahahahaha...

so tomorrow im gonna take it out and have some fun now

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08-11-2009 08:40 AM  8 years agoPost 39
crambell

rrNovice

maryborough, queensland, Australia

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Having a frustrating time would be an understatement. I had a similar problem with my 500. I had metal tail blade holders on and changed them back to the original plastic ones and problem was solved. The tail is now as solid as you want. I am using a 401 and 9257 combo. It seemed that the blade holders were slightly out of balance and the higher the revs the stronger the tail wag. Just my experience, hope you can sort it out as the trex 500 is a great heli.

Chris

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08-11-2009 08:51 AM  8 years agoPost 40
az_heliguy

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San Tan Valley, AZ

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nice...

i got mine sorted out now, but i have to wait to go fly it now because its just about 1am right now and there is only so much flying i can do in the shop, lol...

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