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From: Dale Rogers <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: How long can you fly on your battery??
Date: Sun, 15 May 2005 19:14:11 -0400
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There's also some info (& purchase) at:

http://www.batterymart.com/battery.mv?c=odyssey

Dale R.
 
> From: "Russell Duffy" <13brv3@bellsouth.net>
> Date: 2005/05/15 Sun AM 10:53:36 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: How long can you fly on your battery??
> 
> I was trying to find some info on the Odyssey batteries, and could only find
> data for the PC680.   http://www.odysseybatteries.com/aircraft.htm
> Fortunately, for me, that's what I have :-)
>  
> In the battery world, CX rating seems to mean Capacity when discharged fully
> (10.5 V) in X hours.   I found some comments that said excess heat and
> resistance reduces the efficiency as the current rises, which explains why
> the amp hour rating his higher for a lower current draw.  The only specs
> given for the PC680 are:
> C1= 12.3 Ah     (12.3 amps for one hour)
> C10= 16.0 Ah   (1.6 amps for 10 hours)
>  
> They also list "reserve capacity", which is a standardized rating for the
> amount of time it takes to fully discharge a battery when drawing a 25 amps.
> For the PC680, reserve capacity is 25 minutes.  This spec is given for all
> the Odyssey batteries, and in fact, the PC625 is slightly higher at 27
> minutes.  
>  
> Based on these figures, I should have 45 minutes of capacity easily, and
> will plan to be on the ground somewhere in 20 minutes or less.
>  
> Cheers,
> Rusty 
>  
>  
>  
>  
> 
>