Engine Starter

[randy10926 at comcast.net]

Sounds like I should just directly connect the car jumper/booster pack to the kavan starter.  The jumper wires ought to be big enough to get the job done.

Randy
> What is probably happening is the Kavan isn't getting all the voltage it
> needs, due to resistance. Resistance can come from wire size(too small), or
> the jumpers between the batteries (too small or not well connected), or
> resistance in a connector, or the internal resistance of poor or failing
> batteries.
> 
> These big-boy starters, whether Kavan or Sullivan or ?? draw a lot of
> current- 20-30 Amps or more.
> They want 12 vdc at the brushes. If you start with a 12 volt pack, then have
> a 6 volt drop between the small-gage wires, small inter-cell jumpers, a
> banana plug or two, plus the internal resistance of the battery, the
> remaining 6 volts that actually gets to the starter just isn't enough.
> 
> Some people make up for resistance losses by adding cells. It helps, but
> make sure you got some real big wire throughout the path as well, and the
> battery is capable of putting out 30 amps without a big voltage drop.
> 
> -----Original Message-----
> From: discussion-request at nsrca.org

> [mailto:discussion-request at nsrca.org]On Behalf Of Alan Hewson
> Sent: Tuesday, April 06, 2004 4:34 PM
> To: discussion at nsrca.org
> Subject: Re: Engine Starter
> 
> 
> I tried a Sullivan Dynatron starter on my OS160 last summer with limited
> success.
> I was told this starter would have NO problem on an engine that size.It will
> not turn it over at all when I plug it into my power panel powered by one of
> those "hobby" sized flight box sealed lead acid batteries.
> The only way it works consistently is when I power it DIRECTLY from a 600
> Cold Cranking Amp car battery........Problem.....The flight box gets very
> heavy with a car battery inside it.
> My first contest with that engine, which was only the fourth flight on that
> engine and plane, I had to borrow starters from other pilots. Five out of
> six of the Kavan starter setups would NOT start my engine.
> I'm still looking for the answer......I don't like flipping engines by
> hand......I like my fingers the way they are.
> Alan Hewson
> 
> 
> 

> ----- Original Message -----
> From: "Lee Davis" <lee at piedmontmodels.com>
> To: <discussion at nsrca.org>
> Sent: Tuesday, April 06, 2004 6:26 PM
> Subject: Engine Starter
> 
> 
> > I've got a Hobbico Torquemaster 180 and a Kavan with the 12 nicads.
> Neither
> > cranks my Webra 1.60 worth a flip (note pun).  Any suggestions?
> Preferably
> > an off the shelf solution.
> >
> > Lee Davis
> >
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