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From: "jbker@juno.com" <jbker@juno.com>
Date: Fri, 18 Feb 2005 18:07:37 GMT
To: flyrotary@lancaironline.net
Subject: Amps required to run engine & amp- hours available
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Message-Id: <20050218.100740.19850.104041@webmail31.nyc.untd.com>


One of my planned flyoff flight test is to shut the alternator down and see how long I can fly before systems start to act up. Plan on a second battery during flight test so that I can hopefully restart if necessary or I will join the deadstick club over the airfield of my choosing.

I measured the amps required to keep the one pump, the coils, the 4 injectors while running the engine this morning at about 3000 rpm. It measured at 7.8 amps. Also measured the amps to crank this morning (65 F OAT): 142 amps.

Had ordered a new Odessey PC625 since I had let the 2+ year old one go flat over Christmas. (Yep left the av master on). Had to shock it with 24 volts to get it to take a charge. Turns out, I can't measure any difference of old vs. new during battery test. Hooked up 150 watts of 12 volt halogen bulbs which gives a draw of 12 amps at 12 volts. Man do these things hold voltage until the end.It took 55 minutes to get to 11 volts and dropped to 5 volts in another 15 minutes. 

Based on this, the engine only should run the keep the airplane airborn for about 1:20 hours. How about a sanity check Tracy, ED, etc; what did I miss??

Bernie, (DAR on Tuesday, engine behaving very nicely with new injector)