HT lead splice
06-25-2012, 01:54 PM
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06-25-2012, 01:56 PM
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RE: HT lead splice
Yes , i've done it sucessfully on RCEXL ignitions.
I've got a spark plug lead repair kit and here is the result:
(Sorry for spanish words on pictures, but i don't have a english version yet)
I've got a spark plug lead repair kit and here is the result:
(Sorry for spanish words on pictures, but i don't have a english version yet)
06-26-2012, 10:40 AM
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RE: HT lead splice
My procedure to replace the damaged ignition lead is slighty diferent than explained in the PDF file.
I will post the procedure when i finish translation to english
Best regards
I will post the procedure when i finish translation to english
Best regards
06-26-2012, 11:30 AM
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RE: HT lead splice
ORIGINAL: av8tor1977
Hmmmm, that would worry me. Splicing a high tension line like that, I just don't know..... I don't think I would do it on anything but a ''disposable plane''.
AV8TOR
Hmmmm, that would worry me. Splicing a high tension line like that, I just don't know..... I don't think I would do it on anything but a ''disposable plane''.
AV8TOR
06-26-2012, 11:52 AM
#8
RE: HT lead splice
I have tried many times to splice or repair high tension leads on automotive applications, and they pretty much always "leak", or spark if anywhere near metal. I have also tried unsuccessfully to make an insulated pair of pliers that would keep me from getting shocked while pulling plug wires on a car while it was running to determine a dead cylinder. No deal there either; I always get "zapped".
I would worry that no matter how well you spliced it, once that original uninterrupted insulation is broken, the wire would always be suspect. That piece of heat shrink, even with the original insulation glued back together, just won't have the integrity of the original, unmolested wire. Besides erratic running or possible engine stoppage if the splice "leaks", think of the RF noise......
A new unit is only 50 bucks. Is that worth risking it?
AV8TOR
I would worry that no matter how well you spliced it, once that original uninterrupted insulation is broken, the wire would always be suspect. That piece of heat shrink, even with the original insulation glued back together, just won't have the integrity of the original, unmolested wire. Besides erratic running or possible engine stoppage if the splice "leaks", think of the RF noise......
A new unit is only 50 bucks. Is that worth risking it?
AV8TOR
06-26-2012, 12:28 PM
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RE: HT lead splice
ORIGINAL: av8tor1977
I have tried many times to splice or repair high tension leads on automotive applications, and they pretty much always ''leak'', or spark if anywhere near metal. I have also tried unsuccessfully to make an insulated pair of pliers that would keep me from getting shocked while pulling plug wires on a car while it was running to determine a dead cylinder. No deal there either; I always get ''zapped''.
I would worry that no matter how well you spliced it, once that original uninterrupted insulation is broken, the wire would always be suspect. That piece of heat shrink, even with the original insulation glued back together, just won't have the integrity of the original, unmolested wire. Besides erratic running or possible engine stoppage if the splice ''leaks'', think of the RF noise......
A new unit is only 50 bucks. Is that worth risking it?
AV8TOR
I have tried many times to splice or repair high tension leads on automotive applications, and they pretty much always ''leak'', or spark if anywhere near metal. I have also tried unsuccessfully to make an insulated pair of pliers that would keep me from getting shocked while pulling plug wires on a car while it was running to determine a dead cylinder. No deal there either; I always get ''zapped''.
I would worry that no matter how well you spliced it, once that original uninterrupted insulation is broken, the wire would always be suspect. That piece of heat shrink, even with the original insulation glued back together, just won't have the integrity of the original, unmolested wire. Besides erratic running or possible engine stoppage if the splice ''leaks'', think of the RF noise......
A new unit is only 50 bucks. Is that worth risking it?
AV8TOR
There is of course is no guarantee that the repair of the insulation will work properly. Silicone rubber can be finicky material. One would likely use RTV silicone which often has air bubbles trapped in it. High voltage will cause these air bubbles to sintillate and a corona discharge could occur. We don't want any corona, let alone discharge, to happen in an RC model
Avi8tr have you removed the original wire from the CDI and installed a fresh piece?
06-26-2012, 02:22 PM
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RE: HT lead splice
I would think that if a tube of some dielectric material were placed over the joint between the lead and the shield and held in place with silicone glue it would be safe if the lead were not subjected to further flexing. In fact I have made such a repair and it seems to work but I haven't tried to use it.
BTW $50 is a sum I can use if I can save it by a simple repair.
I don't think I would try to repair a car this way but in that application the ignition is not permanently attached to the lead.
BTW $50 is a sum I can use if I can save it by a simple repair.
I don't think I would try to repair a car this way but in that application the ignition is not permanently attached to the lead.
06-27-2012, 09:49 AM
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RE: HT lead splice
ORIGINAL: w8ye
The ''bump'' at the splice causes a capacitance problem and potential loss
The ''bump'' at the splice causes a capacitance problem and potential loss
06-27-2012, 10:44 AM
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RE: HT lead splice
Most of the responses are usual "can't" when someone wants to repair something. As mpascual (OP) asks, "then why does RCXel make a repair kit?"
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
06-27-2012, 12:15 PM
#16
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RE: HT lead splice
ORIGINAL: Dick T.
Most of the responses are usual ''can't'' when someone wants to repair something. As mpascual (OP) asks, ''then why does RCXel make a repair kit?''
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
Most of the responses are usual ''can't'' when someone wants to repair something. As mpascual (OP) asks, ''then why does RCXel make a repair kit?''
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
If the repair is botched, it will possibly mean the loss of the model from RFI wiping out the RX. The 50$ may become much more.
Reminds me of the time when I lost a finger caused by a balky mower I bought for 25$....but that's another story
06-27-2012, 07:30 PM
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RE: HT lead splice
ORIGINAL: MTK
Absolutely right!! Some have the knowledge and capability to do such a repair...
If the repair is botched, it will possibly mean the loss of the model from RFI wiping out the RX. The 50$ may become much more.
Reminds me of the time when I lost a finger caused by a balky mower I bought for 25$....but that's another story
ORIGINAL: Dick T.
Most of the responses are usual ''can't'' when someone wants to repair something. As mpascual (OP) asks, ''then why does RCXel make a repair kit?''
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
Most of the responses are usual ''can't'' when someone wants to repair something. As mpascual (OP) asks, ''then why does RCXel make a repair kit?''
Some of you are overthinking the issue. Repair it and if it runs fine move on. Not everyone can wipe their rear with $50.00 so if a $10.00 repair works why the concern?
If the repair is botched, it will possibly mean the loss of the model from RFI wiping out the RX. The 50$ may become much more.
Reminds me of the time when I lost a finger caused by a balky mower I bought for 25$....but that's another story
06-28-2012, 06:55 AM
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RE: HT lead splice
ORIGINAL: captinjohn
Why not just replace the entire length of the shielded wire that has good ends on it. Just make sure it is made the same. Capt,n
Why not just replace the entire length of the shielded wire that has good ends on it. Just make sure it is made the same. Capt,n
06-28-2012, 07:00 AM
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RE: HT lead splice
It would be nice if the module were designed that way, it appears that the wire itself is connected inside the module, but the shield is slid over a metal ferrule outside the case and secured with heatshrink, so replacing the complete shield is easy. I tend to agree that the only risk is of the spark jumping to the shield at the point of repair. That would only result in a deadstick, now the wing loading and weight of the model may have something to do with how serious that situation is. A four Star 120 with a DLE 20, not so much
Pete
Pete
06-28-2012, 04:05 PM
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RE: HT lead splice
ORIGINAL: pilotpete2
It would be nice if the module were designed that way, it appears that the wire itself is connected inside the module, but the shield is slid over a metal ferrule outside the case and secured with heatshrink, so replacing the complete shield is easy. I tend to agree that the only risk is of the spark jumping to the shield at the point of repair. That would only result in a deadstick, now the wing loading and weight of the model may have something to do with how serious that situation is. A four Star 120 with a DLE 20, not so much
Pete
It would be nice if the module were designed that way, it appears that the wire itself is connected inside the module, but the shield is slid over a metal ferrule outside the case and secured with heatshrink, so replacing the complete shield is easy. I tend to agree that the only risk is of the spark jumping to the shield at the point of repair. That would only result in a deadstick, now the wing loading and weight of the model may have something to do with how serious that situation is. A four Star 120 with a DLE 20, not so much
Pete
The repair shown by the OP probably works just fine and flying it will prove, or disprove its value. Sophisticated test equipment can tell if it isn't at 100% snuff. Beyond that, if it runs fine, go fly and you have $40.00 to buy other toys.
Actually there are few instances where a flame out is a total disaster. Most dead stick crashes are preventable but the pucker factor usually gets in the way. If the 3D guy gets a woodie from hovering five feet above the runway and the fire goes out...tough! It is preventable.
06-29-2012, 03:35 PM
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RE: HT lead splice
The pictures of replacing procedure and also a video of the result in this spanish forum:
http://www.acro3d.com/public/phpbb3/...hp?f=6&t=12140
More than 20 CDI with HT wire damaged repaired with this procedure, and no problems yet.
If someone is interested , send me a pm.
Best regards
http://www.acro3d.com/public/phpbb3/...hp?f=6&t=12140
More than 20 CDI with HT wire damaged repaired with this procedure, and no problems yet.
If someone is interested , send me a pm.
Best regards
06-29-2012, 06:42 PM
#23
RE: HT lead splice
mpascual, I was wondering if RCEXL makes a CD ignition with no advance? I would like to know....I have some friends that would like them. So would I. Thanks Capt,n
06-29-2012, 10:17 PM
#24
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RE: HT lead splice
That easy,how many do you want.I will send you one to test.
I no a guy that caan build them if you can get him to go to work.He wants to go flying all the time.Besides that he is old and crabby.
BCCHI
I no a guy that caan build them if you can get him to go to work.He wants to go flying all the time.Besides that he is old and crabby.
BCCHI
