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Odyssey Battery-Jerry Springer



 
 
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  #1  
Old August 31st 03, 01:41 AM
Jerry Springer
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Barnyard BOb -- wrote:

Okay Jerry, I took your advice and spent $135 bucks today for an
Odyssey 16 Amp-hr dry cell that weighs 15 pounds (the 680). I cut the
aluminum for a bracket on the gyroscope to mount it but I gotta get
Kevin to TIG weld it later today.



Badwater "I got me a new stinking battery" Bill


+++++++++++++++++++++++++++++++++++++++++

I ain't no genius, but my thoughts are that....
the Odyssey battery is all wrong for your application.

Now go ahead and make a fool of me. g


Barnyard BOb -- needing of a large charge

If he is using a battery which one would work better Bob?

  #2  
Old August 31st 03, 03:24 AM
Barnyard BOb --
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On Sun, 31 Aug 2003 00:41:14 GMT, Jerry Springer
wrote:



Barnyard BOb -- wrote:

Okay Jerry, I took your advice and spent $135 bucks today for an
Odyssey 16 Amp-hr dry cell that weighs 15 pounds (the 680). I cut the
aluminum for a bracket on the gyroscope to mount it but I gotta get
Kevin to TIG weld it later today.



Badwater "I got me a new stinking battery" Bill


+++++++++++++++++++++++++++++++++++++++++

I ain't no genius, but my thoughts are that....
the Odyssey battery is all wrong for your application.

Now go ahead and make a fool of me. g


Barnyard BOb -- needing of a large charge

If he is using a battery which one would work better Bob?

+++++++++++++++++++++++++++++++++++

How about a_40 lb_Odyssey, Jerry? g

The first concern is to successfully SIZE the battery
to this unique demanding application. A 16 amp-hour
Odyssey is going to empty out pretty quick unless one
is willing to start the blades rotating by hand. If one has
to do that, one may decide that the starter, battery, etc are
not worth all the time, effort, weight, complexity and cost.

OTOH......
just keep upsizing the battery until satisfactory performance
is achieved or the gyro is too heavy to fly. g

All this is going through my mind without a shred of
practical experience. So.... take it for what it's worth.


Barnyard BOb -- thinking out loud
  #3  
Old September 3rd 03, 10:12 PM
Paul Lee
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Barnyard BOb -- wrote in message . ..
.... A 16 amp-hour
Odyssey is going to empty out pretty quick unless one
is willing to start the blades rotating by hand. ....


I am using the PC680 Odyssey battery for starting
a 10.5/1, 220HP Franklin engine. It has no trouble
cranking the thing. True, at 225amps cranking the
battery won't last more than a few minutes. But if
the thing does not start in the first 5-10 seconds,
there is something else wrong.

----------------------------------------------------
Paul Lee, SQ2000 canard project: www.abri.com/sq2000
  #4  
Old September 4th 03, 02:25 AM
Badwater Bill
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On 3 Sep 2003 14:12:04 -0700, (Paul Lee) wrote:

Barnyard BOb -- wrote in message . ..
.... A 16 amp-hour
Odyssey is going to empty out pretty quick unless one
is willing to start the blades rotating by hand. ....


I am using the PC680 Odyssey battery for starting
a 10.5/1, 220HP Franklin engine. It has no trouble
cranking the thing. True, at 225amps cranking the
battery won't last more than a few minutes. But if
the thing does not start in the first 5-10 seconds,
there is something else wrong.


That's an interesting application. The 680 is only 15 pounds and it's
small in volume, that's why I like it. I got a hold of a couple 35
Amp-hr Gel Cell batteries today from a buddy (brand new out of the box
and he just gave them to me since his application disappeared). I'm
going to make an APU out of them and use them to hook up in parallel
during my starts. That way I'll have plenty for the flying day.

My real problem here, and I haven't talked about it, is that my blades
aren't tracked properly. I've painted one tip red and one black. You
can't track them without flying the damn thing. In flight, you look
at the tips and see what blade is above the other. Then you land and
reduce AOA on the high blade, spool up again and go for another try.
It's an empirical thing until you get it dialed in. The problem with
a Walmart motorcycle battery is that I get about three starts from it
with a 30 minute charging time between each start and the battery is
toast since it deep cycles to full discharge. That battery is simply
not designed for what I need to do.

Another problem is that I have to crank the engine after I start the
main rotor blades and get them into autorotation facing into the wind.
If there is no wind, I have to taxi to make relative wind and I have
to start the Rotax 582 to do that. I can't do that without a Mambo
battery.

BWB


  #5  
Old September 4th 03, 02:59 PM
Russell Kent
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Badwater Bill wrote:

That's an interesting application. The 680 is only 15 pounds and it's
small in volume, that's why I like it. I got a hold of a couple 35
Amp-hr Gel Cell batteries today from a buddy (brand new out of the box
and he just gave them to me since his application disappeared). I'm
going to make an APU out of them and use them to hook up in parallel
during my starts. That way I'll have plenty for the flying day.

My real problem here, and I haven't talked about it, is that my blades
aren't tracked properly. I've painted one tip red and one black. You
can't track them without flying the damn thing. In flight, you look
at the tips and see what blade is above the other. Then you land and
reduce AOA on the high blade, spool up again and go for another try.
It's an empirical thing until you get it dialed in. The problem with
a Walmart motorcycle battery is that I get about three starts from it
with a 30 minute charging time between each start and the battery is
toast since it deep cycles to full discharge. That battery is simply
not designed for what I need to do.


Ah, now things are clearer. Why not setup your electrical system so that you carry one gel cell battery (no
Odessey at this point) in a quick-change manner? Leave the other gel cells (how many did you get from your
friend?) on the ground on a fast charger. On each landing, swap the gel cell with the most charged one on
the ground. When you've finally got the blade tracking problem solved, go back and install the Odessy 680
as your permanent lightweight battery.

Russell Kent

  #6  
Old September 4th 03, 04:18 PM
Badwater Bill
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Ah, now things are clearer. Why not setup your electrical system so that you carry one gel cell battery (no
Odessey at this point) in a quick-change manner? Leave the other gel cells (how many did you get from your
friend?) on the ground on a fast charger. On each landing, swap the gel cell with the most charged one on
the ground. When you've finally got the blade tracking problem solved, go back and install the Odessy 680
as your permanent lightweight battery.

Russell Kent



I don't need to switch out a gel cell each time. I can do exactly
what you indicate here by simply hooking up to the APU each time and
leaving it on the fast charger. Then I don't have to carry the weight
along with my big gut each time.

BWB

 




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