Li-Poly powered Hornet  
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All Forums >> RC Helicopters >> Electric RC Helis >> Li-Poly powered Hornet
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Li-Poly powered Hornet - 1/15/2003 11:01:03 PM   
tp777fo



Posts: 847
Joined: 2/25/2002
From: Schertz, TX, USA
Status: offline 		Anyone tried Li-Poly batteries on a hornet? Looking at 2-880mah or 3 880 mah cel pack. Worried that 2 wouldnt have enough voltage (9.5 at full charge) and 3 would be too much (13.5v at full charge. Any input?

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Tom Perry
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Li-Poly powered Hornet - 1/15/2003 11:46:39 PM   
WeatherB


 

Posts: 2
Joined: 11/22/2002
From: Toronto, ON,
Status: offline 		Hey,
The 3 Lithium-Poly would give a voltage of 10.4 Volts, not 13 Volts. The 2 Lithium-Poly would give a voltage of 7.2... Everyone is having really good luck with the 3 cells 1020

(in reply to tp777fo)
       Post #: 2

Li-Poly powered Hornet - 1/23/2003 10:52:53 PM   
LSA_Vinnie


 

Posts: 6
Joined: 1/13/2003
From: Finland
Status: offline 		We are using only Lithium-Polymer cells by [URL=http://kokam.koreasme.com/]Kokam[/URL]. Cells we use have capacity of 1020 mAh.[URL=http://kokam.koreasme.com/viewproduct_1_e.html]Specs[/URL] can be found from [URL=http://kokam.koreasme.com/]Kokam[/URL]. Use any search engines for local dealer.

For normal setup of Hornet CP 2 cells is just fine. If you have brushless motor, go for 3 cells - 2 isn't enough. If you are having such a high voltages (and they are correct) I really don't know what cells do you have. Never seen Lithium cells with that high voltages - are you sure your loader if fine? When loading Li cells, current and voltage are critical, be sure to use loader which is made for Li cells. They are expensive, but Li can easily result injury if blown.

WeatherB: you are talking about nominal voltages, which are kind of a minimum voltages if the cells are fine. When you load your 3.7 V (Kokam's nominal voltage, some use 3.6 V), the voltage should be limited to 4.2 V when loaded. That makes 8.4 V for full battery of 2 lithium cells. And for pack of three it would be around 12.6 V.

(in reply to tp777fo)
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Li-Poly powered Hornet - 1/24/2003 11:36:41 AM   
Scotth


 

Posts: 31
Joined: 11/12/2002
From: Long Beach, CA,
Status: offline 		What kind of Hornet? FP? CP? What kind of motor? For a CP Hornet that really goes, a Hacker B20-22s, Phoenix 10 controller, and 3 1020 Kokams in series are perfect.
A CP Hornet with the stock 300 pulls too much current for the the li-polys, unless in some parallel configuration for the 1020's.
FP fliers are getting good performance with a 2 series, 2 parallel pack of the 1020's. Check the Hornet BBS for all the details.
Scott

(in reply to tp777fo)
       Post #: 4

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