AeroElectric-List Digest Archive

Sat 08/31/13


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 03:13 AM - Re: Alternator Putting out Max Current (ChangDriver)
     2. 07:24 AM - Re: Re: Alternator Putting out Max Current (Robert L. Nuckolls, III)
     3. 08:52 AM - Re: AFR Meter (jonlaury)
 
 
 


Message 1


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    Time: 03:13:06 AM PST US
    Subject: Re: Alternator Putting out Max Current
    From: "ChangDriver" <capav8r@gmail.com>
    Bob: Thanks. Actually the battery is new. 28 v system. The alternator (SK 35) is putting out no current at idle. As RPM increases, the current increases. At approx. 1200 rpm 10 amps, 1500 rpm 15 amps, 2000 rpm 22 amps, etc up to maxing out at t/o rpm or 2500 rpm (radial engine). Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=407806#407806


    Message 2


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    Time: 07:24:54 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Alternator Putting out Max Current
    At 05:12 AM 8/31/2013, you wrote: > >Bob: > >Thanks. Actually the battery is new. 28 v system. The alternator >(SK 35) is putting out no current at idle. As RPM increases, the >current increases. At approx. 1200 rpm 10 amps, 1500 rpm 15 amps, >2000 rpm 22 amps, etc up to maxing out at t/o rpm or 2500 rpm >(radial engine). > >Craig > Okay. If your reading the proper bus voltage under load, then the regulator is working. The alternator's output is RPM limited so as you increase rpm, the AVAILABLE output current will rise to a maximum of the alternator's nameplate rating. If the bus voltage is correct and alternator is delivering a lot of current, then something is LOADING the alternator . . . either a discharged battery, operating accessories or a combination of both. Do you have a battery charger/maintainer that you can put on the battery overnight so that we can start with a KNOWN topped-off battery to do some tests? Is this a 'new' condition . . . in other words, has this airplane flown with a normally operating system? Bob . . .


    Message 3


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    Time: 08:52:22 AM PST US
    Subject: Re: AFR Meter
    From: "jonlaury" <jonlaury@impulse.net>
    [quote="nuckolls.bob(at)aeroelect"] .... These sensors have been used on OBAM aircraft for many years. Contrary to popular myth, leaded fuel doesn't seem to 'clog them up' . . . I've met two pilots flying them in 100LL fueled aircraft with useful performance. ... The short answer is, "Yes, an automotive O2 sensor can be a significant component of your operating design goals. Bob . . . > [b] I used Decalin (sp?) lead scavenger from ACS in my 100LL fuel during fuel mapping to prevent lead clogging of the $70 + Bosch O2 sensor. If you want to run a fully functioning altitude compensating EFI, then you need to leave the O2 sensor in the exhaust stream. I used the sensor just to set up my EFI for 12.5 to 1 AFR at max power and will do conventional fine tuning/leaning at Read this topic online here: http://forums.matronics.com/viewtopic.php?p=407813#407813




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