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T-REX 500 › Trex 500 RF interference with 2.4ghz
02-07-2008 05:12 AM  10 years agoPost 61
ARMSMASTER

rrVeteran

spokane, wa

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I still think we need to get ahold of a early production run on the 500 CF to compare the tail belts. I am starting to think that the early production run of these heli's are not having the same issue. At least to the same extreme. I think I will tear down my tail tonight and check to see if the belt is rubbing. I will widen the tail case and the main drive case where the belt comes close. Remove as much possibility of any increased issues. Got my tri fly today

I allmost purchased a large can of 100% silicone spray. It was three times the size of the tri flow and less expensive. I went with the tri fly anyway as I use it on my main shaft and stuff. It is one of the best lubes for heli's that I have ever found.. All I know is that I have my "MAGIC JUJU JUICE"...

Life is like a box of chochlates!

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02-07-2008 09:31 AM  10 years agoPost 62
Kingair Cap

rrNovice

Las Vegas, NV.

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Well, I guess I'll chime in on this topic. I just finished puttin together my 500 GF with an JR R770S PCM 7 channel rx without reading any of this and took it out today to setup the tail and track the blades (MAH Carbons). I went with the fiberglass frame mainly because it was cheaper and it is approx the same flying weight. The glitch factor was secondary, which may not may sense to some but either way. I had a t450 plastic frame for a while and had a glitching problem until I installed a ferrite ring and went to the PCM rx. The problem was resolved.

I was pleased to see the speed controller on the 500 had a pre-installed ferrite ring which led me to believe that Align must be aware of glitching or motor cuts which is what my 450 was doing.

Well, I didn't have a single glitch/wiggle/burp/fart/hiccup/snort or cough. I have the the RX mounted right above the boom, gyro below and a Deans whip on bottom frame. The manual gives 2 locations to mount the speed cont. I moved mine up front after checking wt&bal and it's farther away from the rx which is also stated in the manual(5cm). I've spooled it up several times and had it hovering about 6 times with no problems. Need to get better batteries since the ones I have aren't giving me much time aloft. Can't wait to bang it around..

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02-07-2008 10:01 AM  10 years agoPost 63
lloyd

rrKey Veteran

Perth,Australia (South African)

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Kingair Cap

Was that inn hover or f/flight as a mate of mine was bragging that he had no glitches in hover until f/flight.............

electrics DONT need to auto

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02-07-2008 12:57 PM  10 years agoPost 64
gixxernoob

rrApprentice

fairfax, va

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It would be nice to see on this forum i.e. poll on how many CF vs GF glitch occurrences.


M's Ichiro (51)

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02-07-2008 04:19 PM  10 years agoPost 65
TaleGunner

rrElite Veteran

Deer Park WA

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So far out of all my searching every thread on every forum I could find over the 2 + weeks I have yet to see a GF frame with this issue.
and the way to tell if it is a static issue is if it glitches spray the belt and it stops immediately.

I'm glad your post that the gf is not having problems albeit I don't think using PCM is the reason. others with PCM and GF frames are having this issue.

the ferrite ring is for RF that causes problems for FM 72Mhz and the like. I have been removing ferrite ring since 2.4 came out both on esc bec and long servo leads and had no rec issues.

this static issue with my 500 is the first I have had since my first DX-6.

Armsmmaster
since we can duplicate the glitch at will by cleaning belt we should install a PCM or Dual conversion receiver. Do you still have the stock module and a receiver for your 9303?? we also need to try and find a set of GF frames at Monroe this weekend.

anybody els with a GF frame out there??

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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02-07-2008 04:32 PM  10 years agoPost 66
ARMSMASTER

rrVeteran

spokane, wa

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I tore down my tail assembly last night. The front tail case was showing signs of belt rubbing on the sides. Took the dremmel to it just to widen wher it was rubbing. I also took apart the tail case to check there also. No sign of rubbing, but I did notice that the side of the belt is looking freyd from rubbing. Not bad but some small fine hairs, so you I know it is rubbing somewhere. While I was at it I grounded the tail bearing\shaft assembly to the frame with some fine gauge multi strand wire. I then grounded the front of the tail boom by drilling a small hole in the top of the boom and running a wire with a washer soldered to both ends. I mounted one end to the hole I drilled in the top of the boom and the other in the hole that is in the side frame between the rear most two tail case mounting scresw. I then checked for contineuity between the tail and the frame. Perfect.
Talegunner, I know that you tried this with no positive results, but I figured while I had everything apart it could not hurt. As to the 72mhz idea, I do have a module laying around, but no RX. Also it would be a pain to tear down the tx to convert it from its hardwired 2.4ghz conversion. Possible but not fun. It would be easier to perhaps borrow Bryan's radio and a RX when we get back to try... Possibility. Not sure if I will test hover the heli this morning as the wind is blowing hard. I do intend to take the 500 with me to show it to the guys from DeeTee at the show. They may have some idea's. Also it would be interesting to test fly them over there where the humidity is higher. Might be interesting if that makes any difference.

Life is like a box of chochlates!

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02-07-2008 05:31 PM  10 years agoPost 67
Prophet

rrApprentice

N/A

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what u guyz need is a buckat of lard strapped to the back of the heli and stick a midget in there to shovel the lard onto the belt while its flyin. it working 4 me guys.

peace.

.

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02-07-2008 06:33 PM  10 years agoPost 68
Ben-T-Spindle

rrProfessor

Central Illinois

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Is there a way to prevent static buildup my using some sort of a wiper or brush that contacts the belt and discharged the charge to the frame? Something like the static discharge strips that full size aircraft use on the wing TE.

... BTS

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02-07-2008 08:23 PM  10 years agoPost 69
Paul Susbauer

rrApprentice

Hillsboro, OR

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Perry,
I don't have any PCM's anymore, but I've got my module, I could use a 6 channel FM if you'd like.

Have fun in Monroe this weekend.

--Paul

Ineptitude - If you can't learn to do something well, learn to enjoy doing it poorly.

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02-07-2008 10:03 PM  10 years agoPost 70
ARMSMASTER

rrVeteran

spokane, wa

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Paul,
What I really want to do when I get back is compare tail belts... I may pick up a set of FG frames from Dennis at the show. Not sure if that will fix the issue but there has to be something different between your heli and mine and talegunner's. Only thing that I could figure is the belt, as the problems seem to be coming from there. I guess it would be easy to just change complete tail assembly's as it only takes a couple of min's.. I will have to hook up with you when I get back...
Thanks,
Perry

Life is like a box of chochlates!

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02-08-2008 01:16 AM  10 years agoPost 71
Greg McFadden

rrKey Veteran

Richland, WA

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Perry, do you have the belt handy? if you can read the size/type off it we might be able to find the right belt with a few different materials at http://www.sdp-si.com/ or mcmaster.com and see if there is a better material.

If there is a metal idler pulley, it may also be possible to get a spring finger, or other similar widget, to ground to the frame properly. Worst case we could hook it up to my scope and see if we can see anything.

The silence often, of pure innocence persuades, when speaking fails

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02-08-2008 01:28 AM  10 years agoPost 72
ARMSMASTER

rrVeteran

spokane, wa

My Posts: All  Forum  Topic

Gregg,
Currently it is back together. We leave for Monroe in the morning. It would be neat to check the belt issue. No metal idler pully on the tail as I am sure you have seen Paul's heli. I did ground the tail assembly to the main frame last night. I have not flown it as of yet, but talegunner tried this with no improvement. Like I said it will be neat to get together next week and see what we can figure out. It would help if there was not all this darn snow on the ground....

Life is like a box of chochlates!

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02-08-2008 01:38 AM  10 years agoPost 73
Greg McFadden

rrKey Veteran

Richland, WA

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one thing that might be worth doing is to ground the belt through a resistor, similar to how the esd grounding straps work. It wouldn't seem to me to do much good to ground the tail case without somehow limiting the current released during an arc (assuming it is actually esd).

On the ferrite ring, there is always the chance that while the transmission circuit is immune to the standard fluctuations in voltage, the other IC's might not be so tolerant of noise on ground or power. (I have seen ferrite rings and capacitors help in rc combat boats using 2.4, which tend to be about as noisy an environment as any you will find in rc)

The silence often, of pure innocence persuades, when speaking fails

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02-08-2008 02:28 AM  10 years agoPost 74
Gyronut

rrProfessor

Martinsville In.

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I have the GF version with AR7000 rcvr.

SO far no glitches or brown outs. ESC is at 5.5 jolts

Rick

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02-08-2008 02:42 AM  10 years agoPost 75
Brovic777

rrElite Veteran

Los Angeles, CA

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How many flights u got on it GyroNut? And, what reciever you using and where you mounting it?

Thankx

Killer Beam E4 450
Check out my HD Gallery

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02-08-2008 03:01 AM  10 years agoPost 76
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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The ESD is coming from a charge building up from the belt and pulleys (Van de Graaff Generator). If the belt pulleys and boom are all grounded to the frame you dont have to worry about ESD because it will never have a chance to build to begin with and lube would not be necessary.

"I'm a Virgin.. I'm just not very good at it. "

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02-08-2008 03:05 AM  10 years agoPost 77
Brovic777

rrElite Veteran

Los Angeles, CA

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Widowmaker, but does this apply to the GF Frames that do not conduct eletricity?

Killer Beam E4 450
Check out my HD Gallery

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02-08-2008 03:08 AM  10 years agoPost 78
The_Widowmaker

rrElite Veteran

Bear Valley Springs, CA

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I dont know how that would work. You will still have the effect of the generator but since the GF does not conduct then the discharge would have to go somewhere else.

I had brownout and glitches. I grounded the tail shaft to the boom, boom to frame, front pulley shaft to the frame, motor mount and frame to the negative of the ESC. Nothing since.

"I'm a Virgin.. I'm just not very good at it. "

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02-08-2008 03:58 AM  10 years agoPost 79
steph280

rrElite Veteran

Irvine, California

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Frame material has nothing to do with ESD. Like I said before we chased the same problem on Logo 10's, those had plastic frames.

Receiver type has nothing to do with it either. It has nothing to do with the frequency you are transmitting, the voltage induced "reset" on Spektrums, or whatever else the radio manufacturer claims. We're talking about a static discharge that "spikes" the servo or gyro directly. It's like putting a stun gun on your servo, which is beyond the control of whatever bullet proof receiver you are using.

WD40 works...it's a proven fact.

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02-08-2008 04:04 AM  10 years agoPost 80
Brovic777

rrElite Veteran

Los Angeles, CA

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Makes sense Steph what you said. But has anybody with GF frames experienced these glitches as those with the CF Frames?

I'll know shortly, as I'm still finishing my GF kit.

Killer Beam E4 450
Check out my HD Gallery

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