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RE: Kokam Raises the Bar - again! - 5/13/2004 3:41 PM   
Greg Covey



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Status: offline 		NOW SHIPPING: Kokam 2000mAh 15C and 2100mAh 20C discharge rate battery packs. That's right, the new cells from Kokam are now available. Extreme current capabilities of up to 40 amps in one pack. Forget about wiring packs in parallel. Now you can get the required capacity and discharge rate for most R/C applications in a single battery pack!

CHECK IT OUT AT FMADIRECT.COM!

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RE: Kokam Raises the Bar - again! - 5/13/2004 9:56 PM   
Greg Covey



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Status: offline 		My Super-charged Flubber with the Lehner 1020/15 motor got a face-lift last night in an attempt to improve the in-flight orientation. Hopefully, the extra white on the top side will allow me to track it better.

A close-up of my 3-cell Kokam 2AH (20C) pack shows that I cut pieces of the plastic holder side out for a better fit and air flow.

The pack was just barely warm after 10-15 minutes of heavy aerobatics and 3D maneuvers.

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RE: Kokam Raises the Bar - again! - 5/13/2004 10:47 PM   
3dandpatternflyer



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My guess is that Model Motors in the Czech Republic raised their prices and it just trickled down to us. Hobby Lobby is the exclusive US distributor for the motors but you can purchase them at many places like Atlanta Hobbies, New Creations, and NorthEast Sailplanes to mention a few.


AXI motors MUCH cheaper from www.parkflyermotors.comwww.parkflyermotors.com

most of them $20 cheaper

HL doesn't want any customers anymore.....


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RE: Kokam Raises the Bar - again! - 5/13/2004 11:20 PM   
RCadmin



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RE: Kokam Raises the Bar - again! - 5/13/2004 11:38 PM   
Matt Kirsch



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I suspect that PFMs prices are for motors brought in before the dollar went to pot on the world market. These aren't high-demand items, and it's entirely likely that he's had them for a while. As soon as they're gone, there's a good chance that he'll probably raise his prices to be more in line with the rest of the vendors. It's either that or sell them at a loss. Bill Birmingham is running his shop to make money.

Hobby Lobby raised prices because they motors cost more to import now that the dollar has tanked worldwide.

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RE: Kokam Raises the Bar - again! - 5/14/2004 5:11 AM   
3dandpatternflyer



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Hobby Lobby raised prices because they motors cost more to import now that the dollar has tanked worldwide.


I guess everything cost more to import to HL. Almost every plane went up $10, jeti speed controls, all motors!!

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RE: Kokam Raises the Bar - again! - 5/14/2004 6:47 AM   
Matt Kirsch



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Status: offline 		Umm, yeah. That's what happens when the US Dollar loses 25% of its value on the world market. The price of IMPORTED goods goes up drastically, and Hobby Lobby imports most of their goods.

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RE: Kokam Raises the Bar - again! - 5/14/2004 10:57 AM   
Henke Torphammar



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Status: offline 		Hi guys

good to see someone is making 20C cont cells, the battery industries are going in the right direction... but I don´t like these cells

they are heavy, the wrong shape, and the preice is´t helping either.

Also I can´t really see what 20C cont is good for?! as 20C equals 3min flights. I would rather use a 10C cont cell with burtst capability to 20C as it is lighter cheaper and better shaped.

but I guess 20C discharge means 4C charge (thinking I charge 5-10C cells with 2C) which is good. so this cell almost behaves like a nicd.

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RE: Kokam Raises the Bar - again! - 5/14/2004 4:04 PM   
Sprink



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Status: offline 		Henke, as you say, 10-12C is all you need for most types of flying, that is giving a good duration. However it is always good to operate well within the operating limits, running a 20C battery at only 10C will ensure a longer life, and even better duration.

Thing with Lipo is that it is new technology. By the end of the year 10C - 20C will be standard, and the developments will be in production (getting the cost down) and weight.

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RE: Kokam Raises the Bar - again! - 5/14/2004 5:50 PM   
Matt Kirsch



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Status: offline 		Henke,

To the best of my knowledge, there are no LiPoly cells out there that are designed for 2C charge.

Still 2C charge really has limited usefulness. You're still limited to 4.2 Volts/cell as the maximum voltage the cells can be charged to. A 2C charge would only knock a few minutes off the total charge time. Going to 4C would knock even less off.

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RE: Kokam Raises the Bar - again! - 5/15/2004 1:49 AM   
Henke Torphammar



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True, none of the existing cells are rated over 1C charge. how ever I think the new cells that keep high voltage discharging can hold "low" volgate charging better.

charging the old 1200 Etecs at 3A you can get in almost 1100mAh before the charger has dropped to 1C probably not good for the cells in the long run, but they have not changed shape or started to smell so far.

the goal must be constant voltage charging... put on as much current until 4.2v is reached (at once).

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Kokam 2AH 15C Packs - 5/31/2004 6:52 PM   
Greg Covey



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Status: offline 		I found even a better fit for my Fliton Flubber than the 9oz, 3-cell Kokam 2.1AH (20C) pack.

Here is the new 6oz. Kokam 2AH (15C) 3-cell pack next to a 4oz. 3-cell 1500HD pack. The 2AH pack can deliver 30amps continuous and is a more favorable size for smaller, high-powered aircraft.

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RE: Kokam Raises the Bar - again! - 6/2/2004 8:08 PM   
P-51B



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quote:

ORIGINAL: 3dandpatternflyer

quote:

My guess is that Model Motors in the Czech Republic raised their prices and it just trickled down to us. Hobby Lobby is the exclusive US distributor for the motors but you can purchase them at many places like Atlanta Hobbies, New Creations, and NorthEast Sailplanes to mention a few.


AXI motors MUCH cheaper from www.parkflyermotors.comwww.parkflyermotors.com

most of them $20 cheaper

HL doesn't want any customers anymore.....



O.K, I just went and looked, it looks like about a $2.00 difference in the 2212 series, about $6.00 for the 2820/12 (parkflyers didndn't have the 2820/10 listed), and about $20.00 for the 4120 series motors.

I don't think one series being about $20.00 cheaper qualifies as "most".

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RE: Kokam Raises the Bar - again! - 6/2/2004 8:22 PM   
ChuckAuger



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Status: offline 		HL will beat any advertised price by 15% ( I think), but it's still nice to buy from the little guys.


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RE: Kokam Raises the Bar - again! - 6/8/2004 11:14 PM   
Greg Covey



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Status: offline 		Two of these 2-cell Kokam (15C) 2AH packs in series will power an AXI 4130/14 motor at 30amps continuous.

The two packs are connected in series using a section of the Kokam Series Connector Module.

For details, check out my "Fun World EP" thread in the 3D Flying forum.

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RE: Kokam Raises the Bar - again! - 6/9/2004 9:37 PM   
Greg Covey



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Status: offline 		The series connector joins the two packs as a single 4-cell pack.

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RE: Kokam Raises the Bar - again! - 6/9/2004 10:24 PM   
bassmanh



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Status: offline 		greg,

cani also use these cells with my 4120 ? amps were at about 45 with the 2400 scr nicads . let me know please as i am thinking about changing to lipo`s for my corsair for weight saving and longer flight times.


mitch

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RE: Kokam Raises the Bar - again! - 6/10/2004 5:45 PM   
Greg Covey



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For either cell, the 15C 2AH or the 20C 2.1AH, to would parallel at least two. For the 4120 motor, a 4s2p configuration is fantastic! This is what I am using in my AXI-powered, Graupner Extra 300S. Check out the two videos I just posted in the Glow Conversion forum.

For a 4130 motor, you want a 6s2p configuration of either cell type.

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RE: Kokam Raises the Bar - again! - 6/23/2004 10:55 PM   
Greg Covey



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Status: offline 		See how the 4-cell pack (shown above) of Kokam (15C) 2AH cells powers the AXI 4120 motor in my Fun World EP from World Models.

For further details, check out my thread in the Electric 3D Flying forum.

Fun World EP video (6.5meg)

Fun World EP thread

< Message edited by Greg Covey -- 6/24/2004 4:25:19 PM >

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RE: Kokam Raises the Bar - again! - 6/25/2004 12:24 AM   
Greg Covey



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Status: offline 		Here is another example using a single 3-cell Kokam (15C) 2AH pack.

"Super" Slinger Video (6.5meg)


"Super" Slinger thread

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RE: Kokam Raises the Bar - again! - 6/26/2004 1:04 PM   
Paul Turbine Jet Man


 

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Status: offline 		20 C i dont think so.

Plus the weight is twice as much as the Thunder Power packs 2100 3s 126 grams 24-26 Amps constant. I would much prefer two Thunder Powers in parallel than this So called 20 C.

I might be wrong but it sounds a bit like a gimmick to me.

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RE: Kokam Raises the Bar - again! - 6/27/2004 8:19 PM   
Greg Covey



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Status: offline 		Hi Paul,

It's understandable that news takes a bit longer to reach South Australia.

The 20C cells have been around for a while now and were tested by several of the best trusted names in the business, namely Red Scholefield and Don Srull.

The advantage of these cells was stated earlier in the thread. In addition, it was already discussed that it is not the best fit for everyone and there are many scenarios that do not need the higher current delivery.

In the future, please look at alternative products as another possible solution to benefit your e-flight needs and not as a competition where one solution fits all applications.

< Message edited by Greg Covey -- 6/27/2004 12:24:08 PM >

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RE: Kokam Raises the Bar - again! - 6/28/2004 5:26 AM   
Paul Turbine Jet Man


 

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Status: offline 		Thats fair enough.

No hard feelings i will stick to thunder power in my $1000 + jets and enjoy the performance they provide me

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