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[Non-DoD Source] Re: Alternator Mod CJ-6A

 
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mark.bitterlich(at)navy.m
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PostPosted: Wed Jun 28, 2017 11:58 am    Post subject: [Non-DoD Source] Re: Alternator Mod CJ-6A Reply with quote

It depends on your particular system. I have not worked on CJ-6's, but with the Russian designs you are dealing with a list of parts that can sometimes be difficult to troubleshoot.

Generator
Voltage Regulator
Over-Voltage control
DMR-200 device, which consists of a reverse current relay, main contactor relay, etc.
Bucking transformer

These devices are actually reminiscent of any of the older generator designs found in airplanes and cars. Remember that several decades ago, all automobiles and airplanes ran generators and not alternators. Electrical design advancements let to the alternator as a more efficient, lighter weight, and easier to troubleshoot device. The reasons for switching an airplane from a generator design to one that uses an alternator are just as valid today as they were years ago. More than anything else, they are cheaper (at least from an initial design perspective).

That said, there is nothing wrong with using a generator, and there is also the saying: "If it works, don't fix it", but many aircraft owners with generator systems decide to go with an alternator design, especially when they start having problems, and often-times to save weight and improve reliability.

Mark
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cjpilot710(at)aol.com
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PostPosted: Thu Jun 29, 2017 3:52 am    Post subject: [Non-DoD Source] Re: Alternator Mod CJ-6A Reply with quote

Mark hit on a list of things on why to change over to an alternator. All are very valid. To me weight almost alone, is the most significant. It requires two arms to carry that generator.  Not so the alternator. In these airplanes pounds count. When I got my CJ, it was right out of the box from China. I removed over 186 POUNDS of radios and their needed wiring. After adjusting the CG  with ballast, I was able to realized 133 POUNDS of payload increase.  After installing the M14p, which heavier than the HS6, I found that changing over the alternator, I would NOT have to add as much ballast to compensate if I kept the generator. In aircraft of this size - every pound counts.

BTW anyone need a nice room at OSH?
Jim "Pappy" Goolsby


In a message dated 6/28/2017 3:59:43 P.M. Eastern Daylight Time, mark.bitterlich(at)navy.mil writes:
[quote]--> Yak-List message posted by: "Bitterlich, Mark G CIV NAVAIR, WD" <mark.bitterlich(at)navy.mil>

It depends on your particular system. I have not worked on CJ-6's, but with the Russian designs you are dealing with a list of parts that can sometimes be difficult to troubleshoot.

Generator
Voltage Regulator
Over-Voltage control
DMR-200 device, which consists of a reverse current relay, main contactor relay, etc.
Bucking transformer

These devices are actually reminiscent of any of the older generator designs found in airplanes and cars. Remember that several decades ago, all automobiles and airplanes ran generators and not alternators. Electrical design advancements let to the alternator as a more efficient, lighter weight, and easier to troubleshoot device. The reasons for switching an airplane from a generator design to one that uses an alternator are just as valid today as they were years ago. More than anything else, they are cheaper (at least from an initial design perspective).

That said, there is nothing wrong with using a generator, and there is also the saying: "If it works, don't fix it", but many aircraft owners with generator systems decide to go with an alternator design, especially when they start having problems, and often-times to save weight and improve reliability.

Mark
--


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