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Article #2057

Electric Power Recomendations

#2057
From: John Moonan
Date: Tue, 26 Jan 1993 14:49
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	I'm a long time wet power flyer but this past summer I decided to build
an electric powered glider for a change of pace.  Ended up building a
Goldberg Electra.  Power is the stock motor with a Master Airscrew 2.5X1
gearbox and 12X8 folding prop.  Battery packs are 6 cell 1400 SCR, 7 cell 1400
SCR and 7 cell 1700 SCE.  It flys great and I've had a lot of fun with it for
the last 6 months.  Has a good climb on the 6 cell pack and very good climb on
the 7 cell packs.  Now the question:

	The motor seems to be drawing about 25-30 amps on a fresh charge. I say
this because it blew 20 amp fuses after about 30 seconds of run but has not
blown a 30 amp fuse yet.  Is this a reasonable current for this motor?  Would
I be better off going to a 3.0X1 gearbox or a different prop?  Am still using
the original motor (has about 40 flights on it) and wondering how much longer I
can expect it to last.  Any suggestions for replacement motor (other then
AstroFlight which are expensive) when the time comes?  Would some of the
modified motors that the car racers use work?  How many turns, etc.??
--

					THANX, John Moonan
					SYSOP, 495th R/C Squadron
					Groton, MA
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From: jmoonan@ccv1.bbn.com (John Moonan)
Newsgroups: rec.models.rc
Subject: Electric Power Recomendations
Message-ID: <JMOONAN.93Jan26094904@ccv1.bbn.com>
Date: 26 Jan 93 14:49:04 GMT
Organization: BBN Communications, Cambridge, MA
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