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HelicopterGasser Model RC HelicoptersOther › plug wire has a hole rubbed in it. now what?
11-09-2005 11:52 AM  12 years agoPost 1
AutoMike

rrNovice

Seymour In.

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I have a Burgen Observer that started wagging the tail back and fourth really bad. Swaped gyros, servos, battery and checked and re-checked everything before I found that a screw from the fan shroud had rubbed the plug wire thru its outer sheath to expose what looks like the metal braid. The spot is right near the coil itself and im unsure of how to fix it with out dropping the $55 for a new one. After searching RR I'm sure I'm getting large RF noise from this problem. Anyone have this happen to them and got the fix? If it takes buying a new coil so be it. Thanks. Mike

Bergen Observer w/G230 (belt tail)
Futaba 8U/R148DP
JR DS 8231's on cyclic/collective
JR DS 811 tail/throttle
CSM 360 gyro

Dang!! Thats going to leave a mark....

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11-09-2005 12:33 PM  12 years agoPost 2
AceBird

rrElite Veteran

Utica, NY USA

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You could try RTV wrapped in cheese cloth or something poris that will conform to the outside shape of the wire. When it has cured trim off the RTV that may ooz through the cheese cloth and wrap with good vinyl electrical tape. The braid is a shield and you will get rf interference from rubbing it to frame parts. Once covered with RTV and tape it will be like new.

Ace

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11-09-2005 01:39 PM  12 years agoPost 3
rcadd1ct

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Richardson, Texas

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I use spiral wrap on the high tension lead to protect it from chaffing.

I replace the wrap as needed.

I know it won't help you now but it might on the next one.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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11-10-2005 12:48 AM  12 years agoPost 4
BIGRCR

rrVeteran

Easley, South Carolina

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I use fiberglass (high temp) electrical tape. It is white and looks very similar to bandaging tape. I would put some heat shrink over the spot and then use the tape.

Later

BIGRCR- John Garst

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11-10-2005 12:02 PM  12 years agoPost 5
AutoMike

rrNovice

Seymour In.

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Well guys, I took the coil off to take a good look at what I had and it didnt look as bad as I first thought, no braid showing,the way the rubber was scuffed up made me think it was. Still I thought I should try something since I had it off. I wraped the the plug wire with foil, ran some 18 gauge insulated wire along most of the plug wires length, carefull not to get to close to the boot with enough on the other end to attach to the engine, maybe to give a good path for any RF discharges was my thinking. Then I wraped the whole mess up with electrical tape. Flying showed the problem was still there, no better and no worse. Looking over RR again I've found that I might have a static discharge problem from my belt drive tail. I've flown this heli for a month with out this problem but it is much colder now here and maybe that helps generate the static. I dont know, but its driving me NUCKING FUTZ! I grounded the tail to the motor with a wire this morning but I'll test fly this afternoon before I go to work to see if its gone.

Thanks for your thoughts in this matter....MIke

Dang!! Thats going to leave a mark....

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11-10-2005 02:37 PM  12 years agoPost 6
Chris Bergen

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cassopolis, MI USA

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2 things,

If you have a worn spot in the coil wire, then wrap it with aluminum foil, the spark may be able to jump through the worn spot and ground out to the engine, causing it to be difficult to start!!

Second, we have found it is better to ground the boom to the triple bearing block instead of the engine.

On the plug wire problem,,,,Even if the nut broke completely through the rubber and touched the underlying wire, what path would it take to ground out? The shroud is plastic, the shroud mount is G10 which is an insulator.

Very likely the problem you are seeing is just what you thought, the belt drive, although it typically shows up in the aileron servo, not the tail.

Chris D. Bergen

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11-10-2005 07:00 PM  12 years agoPost 7
BigNev

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Hertfordshire -U.K.

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Re your wagging problem - I had the same problem with a 2nd hand intrepid gasser that I rebuilt.
The whole problem was binding of the tail pitch change mechanism, the steel slider tube that runs on the tail drive shaft was worn and the ball links that connect the tail grips to the slider mech were worn oval slightly so they were binding under load (the tube was so worn that when i tried to disassemble it from the yoke arm the threaded part twisted straight off the shaft )
Q ? do you notice the wagging is worse just hovering - I tried a slow piroutte and the tail was very slow to respond and wolud jerk 40-45 degrees at a time.
If your heli has flown well before, are you sure its RF. mine has a braided sleeve on the HT wire, and tail eathed to clutch brng block and never had any noticable glitching.
All my tail troubles were from the worn tail mech (also check the thrust brngs in the blade grip holders as these can become indented after a while and will cause the holders to rock in and out of the dimples)
good luck
Neil

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11-10-2005 09:08 PM  12 years agoPost 8
AutoMike

rrNovice

Seymour In.

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Ok guys, I ran out to the feild and test flew it yet again and I still had the tail kick. Its about a 20* sweep starting nose left then overcorecting to the right before returning to original heading. So back home I went and removed all that mess from the plug wire back to its original state, Chris,l too thought it might cause bad engine performance but with the foil and ground lead on, if the engine missed a beat I would know the plug wire might be the root of the problem. However the engine started and ran perfectly. Chris, I dont know what the triple bearing block could be on the Observer, I have no manual for it, but along with the wire that I have ziptied to the front of the boom, surface cleaned of the anodizing, and ran to the engine I ran another wire from the back of the boom from one of the screws just ahead of the gearbox, to the bearing block above the clutch. So back out I go to the feild with two wires from the boom and no crap on the plug lead and now I'm only getting a small twitch every few seconds. Well its better but still there but I flew a few figure 8's which I wouldnt dare do before. So i'm close but surely would have thought I have the tail earthed well now and the problem, even ever so small, is still there. I've used two gyros and two servos and even tried a new battery at 6v instead of 4.8 and see no change. My range test on the ground with the engine ran up is about 400ft with the entenna down before failsafe kicks in. I'm about to call a Preist for holy water and go to the corner, pull my knees to my chest and start rocking back and forth. LOL... Mike

Dang!! Thats going to leave a mark....

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11-14-2005 02:57 AM  12 years agoPost 9
AutoMike

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Seymour In.

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thought I'd post an update. Its fixed! Static discarge from the tailboom was the cause and I fixed it by grounding the tailboom with a cap head screw in a taped hole at the front of the boom between mounting brackets,4-40 and being carefull not to put the belt in harmes way. Then conecting with two wires, one ran to the engine block and one to the clutch bearing block. It seems to have done the trick but I only have one test flight of a few minutes so far, but all of the kick was gone and it never showed up the whole flight. Chris, you has stated that the triple bearing block was the best place to groung the tailboom to. Can you point this dummy in the right direction as to what location that is within the frame. I assume I should be looking for something on the main shaft but i cant find any shaft that has three ball bearings on it and the bearing blocks on the main shaft appear to be composite plastic maybe. Anyway I must be mis-understanding what I'm looking for. Thanks for all the input gang! Mike

Dang!! Thats going to leave a mark....

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11-14-2005 05:45 AM  12 years agoPost 10
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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The triple bearing block is the block above the clutch bell. There are three bearings in it, hence the name .

The main shaft bearing blocks are aluminum, just with a very good anodizing job on them.

Chris D. Bergen

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11-14-2005 07:14 AM  12 years agoPost 11
AutoMike

rrNovice

Seymour In.

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LOL...well ,I found it by luck but didnt even know it. Yep ur right, that is a very good place to ground the boom...lol I got'a invest in that manual on cd Thanks, Mike

Dang!! Thats going to leave a mark....

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11-14-2005 03:41 PM  12 years agoPost 12
Chris Bergen

rrElite Veteran

cassopolis, MI USA

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If you need one, PM me your address.

Chris D. Bergen

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HelicopterGasser Model RC HelicoptersOther › plug wire has a hole rubbed in it. now what?
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