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  #11  
Old 06-27-2017, 07:47 AM
Mich48041 Mich48041 is offline
 
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Mike knows what he is talking about. Listen to him.
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  #12  
Old 06-27-2017, 12:56 PM
bob1393 bob1393 is offline
 
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Thanks guys I appreciate all the comments. As there are 3 of us who own this plane together, it makes the cost of the VR about $60 each. We will no doubt continue to use the Ducati VR, wired per Van's plans, and just hope we can get a longer life with them, as some others have had.

Bob
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  #13  
Old 06-27-2017, 01:12 PM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by MMiller View Post
If you have a pre 2010 regulator, it will fail because of INTERNAL cooling design issues, if you run these at low power, they will last forever.

If you have a 2010 or later version it will likely fail from operational vibrations acting on manufacturing induced, prestressed component leads, in a potting compound that is temperature unstable.

Anyone who tells you the failures are caused because Vans didn't follow the Rotax required wiring plan doesn't know what they are talking about, they don't have a clue to how this regulator works.

Mike
Mike, I have one with a fairly hard, light green potting compound. The plane was completed in late 2011, but I have no idea when the FWF package was purchased. Any idea of a solvent that will work on this stuff? I'd like to get the PCB out and touch up the solder joints. So far it's coming out in crumbly chunks. I've got the bottom of the board mostly exposed, but no luck getting further than that.
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RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
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  #14  
Old 06-27-2017, 01:27 PM
bajapilot bajapilot is offline
 
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Location: Shingle Springs, CA
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Mike,
That makes sense to me since my Rans is glass smooth and my 12 feels somewhat buzzy. I just figured that was the difference between a tube fuselage and 10K pieces of aluminum flying in formation. Do you think it would help to use rubber vibration isolators to mount the VR? Mine with 212 hours is starting to get sloppy with voltage control.
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  #15  
Old 06-27-2017, 03:07 PM
MMiller MMiller is offline
 
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Location: Babylon NY
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Dale, you have a pre 2010 version, that's how those come apart. It will have PN 343620 stamped on it. The date code is above the word DUCATI, the first two digits are the year, I'm not sure if the second two are month or production run of that year.
These are not repairable, mostly because you can't fix the design issue, but there is a workaround. These fail from diode/plate separation. The inability to adequately transfer heat to the case causes the diodes to unsolder themselves. You can add a 35-50 amp 1000v bridge rectifier externally and jump the the two A/C pin to the regulator G terminals and jump the + pin to the R & B terminal. The bridge - pin is unused. This bypasses the damaged connections and moves half the heat out of the regulator.
If the connector is good, you could Install a new PCB and rework it like a current version regulator.

Bajapilot, I don't know if that will help, and I doubt it will hurt. Vibration is only one part of the problem. You still have prestressed component leads and a potting compound that is too soft and unstable. If you try this, you must ground the regulator case to the airframe.

Mike

Last edited by MMiller : 06-29-2017 at 05:03 AM.
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  #16  
Old 06-27-2017, 03:37 PM
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DaleB DaleB is offline
 
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4-digit date code is most likely a two-digit year and two-digit week, from 01 to 52. Thanks for the tip about using the half bridge... I can see how that would work. Not a bad idea, as long as the SCRs are good.
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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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  #17  
Old 06-27-2017, 08:43 PM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by MMiller View Post
Yup, month and week is the industry standard, but in all the regulators I've seen, the second set of numbers never went higher than 10....maybe Ducati doesn't follow industry standards.
It's Italy. Maybe they only count work weeks.

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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
-=VAF=- 2017 dues paid
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