Electric Pattern

[jim ivey]

Mike
You are correct. I burned out a alternater using a 250 watt linear amplifier 
on a CB radio setup one time.
The linear amp when keyed was pulling 30 amps + . Add the car load and 
that's a lot of currant.
It takes out the diodes that rectify the AC to make it DC in the alternater.

Jim Ivey




jivey61 at msn.com





>From: <mdarr00 at comcast.net>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>Subject: Re: Electric Pattern
>Date: Sun, 10 Aug 2003 18:08:57 -0400
>
>     Bill, you are correct about a cars alternator putting out 100 amps.  
>Some put out less, maybe around 80 amps, and some put out as much as 130 
>amps.  The concern is that they do not put out that much current at idle.  
>At best they may put out 20 amps.  Before you get the max amperage output 
>of an alternator, you would need to rev the engine to approx 2,000 rpms.  
>Obviously if you had the hood open the underhood lamp would also be on, 
>your engine is running, so you have the ignition system, cooling fans, 
>engine computer, and all of the sensors needed to make the engine run 
>drawing current.  Having said that, now you add your battery charger, that 
>may or may not put you over what your alternator may put out at idle and 
>now you are running on just the car battery.  While this is happening the 
>alternator is trying to keep the battery charged to the best of its ability 
>which is not much at idle, causing the alternator to burn up.  Food for 
>thought.
>
>Mike Darr
>   ----- Original Message -----
>   From: Bill Glaze
>   To: discussion at nsrca.org
>   Sent: Sunday, August 10, 2003 3:56 PM
>   Subject: Re: Electric Pattern
>
>
>   I can't imagine burning out a perfectly good alternator that is rated 
>for 100 amps by just charging a battery.  I've done it so many times.  Yet, 
>I suppose if there was something else going on, it sure could happen.  I 
>mean, this mechanic said he's seen it.  It's just hard to imagine--my 
>alternators put out ~14.7 volts x 100 amps. = 1,470 watts.  Lots of 
>current.  Last time I looked, that's more than a large TV uses, or even a 2 
>slice toaster.  I'd like to know what the DC current draw is on Jason's 
>chargers.)
>   Oh, Well.
>   Bill Glaze
>   Ron Van Putte wrote:
>
>
>     Bill Glaze wrote:
>
>       Word I got  was $750 per pack for Jason's setup, and 1-1/2 hr. 
>charge time.  Don't know the power source for the charger.
>
>     Tony Stillman reported from Poland that he went to a local car parts 
>place and bought a car battery and car battery charger for Jason to use in 
>lieu of charging from the car's battery while it was running.
>
>     Ron Van Putte
>
>       ArestiPattern at aol.com wrote:
>         I'm thinking this new e-pattern flying might be pretty trick to 
>try.  As far as costs go, I'm a bit concerned about the battery packs and 
>charger needs.  I've read the Li-Polys Jason's using are about $325 bucks 
>each so $700 for the plane (that'll come down in price for sure).  So, if I 
>head to the flying field after work to bang off 4 to 6 practice rounds in a 
>couple of hours, how many battery packs and chargers am I gonna have to buy 
>to get this done?  Will I be carrying a Honda portable generator along to 
>power my 'bank' of chargers as well?  What is the re-charge time for one 
>pack?
>         I peeked in the Hacker booth at the last TOC, really impressive 
>stuff and an awesome halftime show each day.  Granted, they were setup to 
>fly several models at the show, but the spaghetti of wires and chargers 
>they had to get this accomplished simply twisted the mind.
>
>         Rick Hannah
>         St. Joseph, Michigan
>

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