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Old May 23, 2001, 05:35 PM
small electrics r BIG FUN
Iowa
Joined Aug 2000
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How good are Sanyo 1600 Twicecells ?

These are Nimh and AA size. I am wondering their weight and amp rating. Use would be in 400/480 applications.

Thanks

Al
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Old May 23, 2001, 06:07 PM
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Haldor's Avatar
Stavanger, Norway
Joined Feb 2000
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The word is <10A - so mostly s400 stuff (preferably geared) and lower.

Have wanted to try'em out but dont have an application suited yet.
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Old May 23, 2001, 06:45 PM
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Coimbra, Portugal
Joined Feb 2000
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I have a pack of 8 in my standard Pico-jet and they work fine (I would estimate about 25 cycles to this day). I charge this pack at 1,5 Amps with my Graupner Ultra-duo in the "sensitive mode".
I feel that this charge value can be raised a little if the pack is cooled during charge.
I have seen somewhere that the trick is to stay below 60 C temp. during the charge process, wotherwise you kill the cells.

Regards,

Joo

They also work great in a Graupner Cumulus 2000 motor glider with a geared 480.
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Old May 23, 2001, 07:03 PM
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Chicagoland
Joined Feb 2000
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Don't bother. You will be much happier with 1100AAU cells. Unless the goal is 20 minute flight times the NiCd cells will give you much more power at any given current. The flight time isn't that much shorter and you should get 9 minutes or more. I wouldn't go over 12A with these cells though.

Greg
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Old May 23, 2001, 10:16 PM
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Austin, Texas USA
Joined Mar 2001
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I use these cells in an 8 pack for Speed 400/480 where continuous is around 10 or 12 amps. They work well in a Zagi and Terry that I fly them in, and I have a mostly finished Cumulus 2000 that I can't wait to get them in. Many use them in Zagis around here.
And actually, the 1100AAU cells have a pretty high internal resistence, and lose about .1 volt a cell at 10 amps. So an 8 cell pack almost loses a whole cells' worth of voltage. Granted the NIMH do this also, but sport 1600 mah capacity.
I also put them in my Transmitter. If I forget to charge, so what. They last 3 times as long as the stock nicads.
We sell 8 cell packs of the Sanyo 1600 NIMH right now on sale for $24 with quality silicone leads.

Shawn
Eflightpower.com

[This message has been edited by sf_247 (edited 05-23-2001).]
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Old May 23, 2001, 11:42 PM
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Sean, try a pack of the 1100AAU. You will be very surprised at how much more power you will get. Internal resistance of the 1600NiMH is about .022 Ohm and the 1100AAU is about .016 by my tests. Yes is does show up as a voltage loss for a given current. It also shows up as a current drop for a given motor and prop combo. Switching to the NiCd pack not only increases voltage, but also current. The result is much more power than you think.

There are no other cells to choose from in this category. Using weak cells will just not give you a chance to experience what electric models are really capable of. Flying for 10 minutes isn't really a feat anymore. Doing it with power to spare is.

You don't have to worry about charging the NiCd cells. They will also last longer than the NiMH cells.

Greg
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Old May 25, 2001, 06:42 PM
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WC,WS,WC
Joined Dec 1999
713 Posts
Did someone really tested and measured the voltage of those 8x1600 NimHs at 10A's draw, instead of gessing it?
PT
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Old May 26, 2001, 12:00 AM
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Austin, Texas USA
Joined Mar 2001
848 Posts
PTLdom - Here you go.

<img src="http://www.eflightpower.com/media/tests/600AE_vs_San1600.gif" width="510" height="539">

Shawn
Eflightpower.com
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