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Old 12-15-2002, 09:01 PM   #76
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Couldn't find a 3PJS thread(or its been inactive for too long) but its quite valid here too

I live in Australia where 75Mhz is Illegal...anyone bought a HK/Other transmitter with a 40 Mhz module wanna swap?

PM me or email me.
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Old 12-15-2002, 10:33 PM   #77
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Default 9 cells in the battery compartment?

Guys;

I looked at my 3PDF and I dont see how you are getting 9 cells in there. I MUST be an awfully tight fit in there. Once you DO get them in there. Do you use servo tape to hold it in place?

Got to hold a 3PK in my hands at the track today. Definately a more solid feel to it than the older radios. Balance felt very nice too. The guy was using to race his Micro RS4.
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Old 12-15-2002, 10:47 PM   #78
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Default Actual battery voltages

Christopherkee;

Not to disagree with your stated bettery voltages but, in actuallity brand new AA alkalines are between 1.58 & 1.61 volts each depending on the brand and freshness. A fully charged NiMh or NiCd will probably be closer to 1.5 volts each for at least 1/2 of it's rated Mah. It's still pretty close when comparing 8 alkalines to 9 rechargables.
Still like see 9 cells in the Futaba's battery compartment. Anyone willing to post a pic or two.
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Old 12-16-2002, 01:46 AM   #79
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bong: yes, mine came w/the tray. if the 3PJ batt tray will fit, you can get it from lils or action hobbies, i think i saw one in their shelves the other day. if you do get the tray and you dont have AA's yet, get 1850mah nimh AA's. theyre relatively inexpensive yet provide very long usage between charges. ive used mine for about 4 whole RC days and it still reads 9.8v
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Old 12-16-2002, 08:04 AM   #80
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I was using the advertised voltage numbers. Says it on the side.

Energizer AA Alkaline E2 = 1.5v 3135mAh
Energizer AA Rechargeable = 1.2v 1600mAh

After recharding my 1600mAh I usually get 1.35v per cell after 5 minutes of cool down. The voltage is higher right off the charger but drops quickly as it cools. Additionaly the first 15 minutes of use will drop the voltage closer to 1.28v - 1.3 per cell.
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Old 12-16-2002, 10:12 AM   #81
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Default Charge rates

Christopherkee;

I'll bet your charging at .5 amps, while I'm charging at 1.0 amps. That would explain the voltage differences. I always read over 1.5volts for BRAND NEW alkalines. When they are ready to be tossed they usually read 1.35volts/cell.
How about some pics of those 9 cells squeezed into the battery comparment?
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Old 12-16-2002, 10:28 AM   #82
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Yah... I find when using the .5 to charge it gives longer runtime. I'll take some pics tonight. Need to borrow a digi cam.
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Old 12-16-2002, 08:11 PM   #83
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Couldn't get a digi cam... Just take 9 AA's and put them side to side... it fits perfect. If you are using a tray it may look to small.. pull the tray out and just lay the batteries in there... You'll see what I mean.
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Old 12-16-2002, 08:23 PM   #84
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Dear Popracer,

The typical configuration for 9 cells to fit in Futaba's radio is as follow:

4 cells, one cell(vertical),4 cells and replace that with KO's radio plug. Just solder everything together like any straight pack.

Here is just a typical diagram of the pack that sells in Hong Kong:

____ Vertical Cell

[] Horiztonal Cell


________[ ]________
________[ ]________
________[ ]________ Right here is the plug for the transmitter.
________[ ]________

Hope this will help you out
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Old 12-17-2002, 03:24 AM   #85
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marvi
yup, am using 1600s previously with my ko and it lasted quite a number of days between charging. if you're on the lookout for new batts, gp has come out with 2000mah batts.
are you going this sat at mang's?
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Old 12-17-2002, 09:37 AM   #86
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Default 9 cell config. for the Futaba's

TRF414M;

I just have to figure where to but the charging tabs. I charge at 1 amp.

Thanks.
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Old 12-17-2002, 11:18 AM   #87
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The connector can handle a one amp charge... I tried it out last night. I used the other end of the extension and clipped onto the bare wires. Left the contoller on with the throttle pulled back to test runtime. You get a longer overall runtime with .6A. Test it out. My 9 cell pack is laid side by side with velcro on the inside to keep it in there tight.



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Last edited by ChristopherKee; 12-17-2002 at 11:41 AM.
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Old 12-17-2002, 06:45 PM   #88
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saw those gp 2000 AAs in ace hardware, a bit expensive compared to sanyos. i hope to be there on sat
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Old 12-17-2002, 07:03 PM   #89
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Default Futaba 9 cell installation

Christopherkee;

That is EXACTLY the way I'm holding my cells (8) in also.

So what your saying is that 9 cells will fit side by side inside the compartment (and the door will still close)?

I cut a Battery bar in half and soldered 1/2 on each end of the pack so I can clip the charger leads on without having to remove the pack from the Transmitter base.
Not too concerned about run time. Can go 2 weekends with two cars and still be about 9.7 volts when I'm done. Usually charge for every weekend anyways as the extra voltage helps the range and adjacent signal rejection.
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Old 12-19-2002, 09:14 AM   #90
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Custom Painted 3PK to share,
Attached Images
File Type: jpg 3pk_limited.jpg (88.3 KB, 137 views)
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