AeroElectric-List Digest Archive

Sun 09/13/09


Total Messages Posted: 7



Today's Message Index:
----------------------
 
     1. 06:21 AM - Re: Tachometer Generator Wiring (Robert L. Nuckolls, III)
     2. 12:39 PM - Re: Grounding Lug (Glen Matejcek)
     3. 01:32 PM - Re: Tachometer Generator Wiring (Craig Winkelmann)
     4. 03:41 PM - Re: Ray Allen T2-7A trim sevro problems (Steve Leonard)
     5. 04:48 PM - Re: Tachometer Generator Wiring (Craig Winkelmann)
     6. 04:54 PM - Re: Ray Allen T2-7A trim sevro problems (Eric M. Jones)
     7. 06:10 PM - Alternator Noise (LARRY FLORMAN, M.D.)
 
 
 


Message 1


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    Time: 06:21:26 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Tachometer Generator Wiring
    At 08:09 PM 9/12/2009, you wrote: ><capav8r@gmail.com> > >I have a tachometer generator on my aircraft. I am changing the >tach from an analog to digital tach. The wiring from the tach gen >is two leads and neither are shielded. Given this is an AC signal >in the aircraft, I was wondering if these leads need to be >shielded. Any advice or insight into tach gens would be welcome. No. It's a sine-wave, low voltage, low frequency signal that does not propagate electrostatically between bundles. Bob . . . --------------------------------------- ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------


    Message 2


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    Time: 12:39:10 PM PST US
    From: Glen Matejcek <aerobubba@earthlink.net>
    Subject: Re: Grounding Lug
    HI Mike- I have a similar configuration and used a similar solution. I acquired a tube of goo used to protect aluminum electrical connections from corrosion and and applied it to the joint area. I'm on the road at the moment, so I can't access the brand, but IIRC I got it off the shelf at a local home improvement center. Actually, I'd bet just about anything it was GB, or G&B, whatever the big name brand is for electrical accessories. FWIW- > >Time: 10:56:21 PM PST US >From: MLWynn@aol.com >Subject: AeroElectric-List: Grounding Lug > >Hi all, > >I am building an RV 8. The battery is rear mounted. I was planning to >ground the battery to the lower longeron that is directly adjacent. I >checked with Vans, who said that four or five rivets no closer than 1/2 inch >apart is fine structurally. > >I had previously primed the longeron, so I carefully scraped that off and >buffed it up with white Scotchbrite. I built a lug of 1/8th aluminum with >a 1/4" nutplate on the bottom, which I also carefully polished up. The >question is, is it okay to just rivet these two pieces of aluminum together or > >is there something I should sandwich in between them to improve the >connection? Does the bond need to be sealed with dielectric grease or some such? > > What have others done in this situation? > >Regards, > >Michael Wynn >RV 8 Finishing >San Ramon, CA > Glen Matejcek


    Message 3


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    Time: 01:32:32 PM PST US
    Subject: Re: Tachometer Generator Wiring
    From: "Craig Winkelmann" <capav8r@gmail.com>
    Thanks Bob. I have been told by some other folks that the tach gen can be a significant source of noise. It is my understanding that in the original wiring in this aircraft (Yak) the tach gen leads were shielded. Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=262817#262817


    Message 4


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    Time: 03:41:06 PM PST US
    From: "Steve Leonard" <buzzleo@graceba.net>
    Subject: Re: Ray Allen T2-7A trim sevro problems
    I can't find this in acronym finder "TSCMR" what does it mean? SEL


    Message 5


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    Time: 04:48:42 PM PST US
    Subject: Re: Tachometer Generator Wiring
    From: "Craig Winkelmann" <capav8r@gmail.com>
    Bob: The problem I have is that at RPM below 1000, I get noise in the signal and the tach jumps all over the place. Over 1000 RPM and all is fine. The radial engine idles at 500 rpm so this is a problem. The tach gen wires go to a circuit that is a basically a voltage divider and a comparator to provide a clean pulse for the engine monitor system. It has been suggested to 1) shield the tach gen wires to reduce noise, 2) add a 0.1 microfarad ceramic capacitor as a filter, and/or 3) change the voltage at which the comparator triggers (raise the limit for it to trigger). Any thoughts would be appreciated. Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=262838#262838


    Message 6


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    Time: 04:54:00 PM PST US
    Subject: Re: Ray Allen T2-7A trim sevro problems
    From: "Eric M. Jones" <emjones@charter.net>
    True Servo Control for MAC/RAC. This name comes from the fact that the MAC/RAC trim box is just a motor and a position indicator pot that are not connected to each other. The TSCMR makes it a real servo and there are advantages to doing so. See my website. -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=262839#262839


    Message 7


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    Time: 06:10:18 PM PST US
    From: "LARRY FLORMAN, M.D." <larryflo@prodigy.net>
    Subject: Alternator Noise
    I have built a SeaRey witha Rotax 912.- It has an internal alternator.- I have a tremendous amount of noise in the headset.- I have isolated the problem to the regulator or alternator.- The Radio Shack filters are no longer available.-- Any suggestions?- Ameriking?




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