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Sp 2 Temp Help . . .
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brushlessron
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Sp 2 Temp Help . . . - 09.04.2007, 06:49 PM

Hey You All BL Mentals :) ,
My name is Ron from Israel ,
Im Reading the forum since 95 almost everyday.
Its very hard 4 me to write in eanglish , but i can read and understand very very good ( thats why i never post....) ,
I need some help from you guys ,
Im the only BL racer in israel !!!! , 1\8 buggy .
My setup is -
Lehner 1940\7 BK 9918 flight power 4900ml gearing - 15/46 , cutoff set
To -3.5V .
The out side tepm is - 45c , batt - 62c ,motor - 75c , controller - 82c . run - time - 14 min ( under very hard race condition ) .
And i need to get 15 min , and 30 min a man ,
NEED TO KNOW HOW TO GET THERE .... !
(I will never ever go back to nitro .... ) TNX ,
Ron .
   
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BrianG
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09.04.2007, 07:02 PM

Hello and welcome!

Just for those who don't know C temps, here are the F readings: outside: 113*F, batt: 143.6*F, motor: 137*F, ESC: 179.6*F.

That said, your temps are kinda high, especially for the batteries. But, it's hard to get low temps in such warm climates. I would gear down a tooth or two. Not only should this help temperatures, it should also increase runtime a little because everything is not running as hard. Of course, top speed will not be as high.

You didn't specify, so I assume you are running 4s on your lipos? You could run 5s instead and reduce the gearing even more. That would help keep your top speed while reducing the load. That should easily get you over 15 minutes.

However, to get 30 minutes plus, you're gonna need higher capacity batteries. Maybe a Maxamps 10Ah 5s pack.
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jnev
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09.04.2007, 08:32 PM

Welcome Ron!! Even an 8000mAH 5s pack should reach 30 minutes pretty easily. A 10,000 pack may be a little excess weight to carry around especially in a 1/8 buggy.


   
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BrianG
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09.04.2007, 09:17 PM

I was going to suggest the 8Ah packs, but he's using FP 4900's right now (which hold up better under load) and can barely squeak 15 minutes. That's an average of 19.6A. At 8Ah, that'll be 24 minutes - a little shy of the 30 minute goal. The 10Ah pack, even though a little heavier should be right around 30 minutes.
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nieles
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09.05.2007, 03:58 AM

Quote:
Originally Posted by brushlessron View Post
cutoff set To -3.5V .
if you set the cutoff so high you will get less runtime than when you set it at 3.1(or 3.0 is also good) it wont help too much but you can try it.
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Tnx 4 the welcome ....
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brushlessron
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Smile Tnx 4 the welcome .... - 09.05.2007, 06:28 PM

BrianG
Yes im using 4 cell , no Maxamps 4 me ...
But i have 6cell v power , do you think the BK will handell it ?
If it will ,
Then what kined of nue motor ?
TNX .
   
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BrianG
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09.05.2007, 06:36 PM

Since the 9918 can handle 18 cells, which is 21.6v, it should be able to handle 6s (22.2v). Actually, depending on how old it is, it might even be equivalent to a 9920, which can handle 24v.

However, the BK ESCs only run 2 pole motors; the Neus are 4 pole. So, Neus won't work for you.

You might be ok to run that 1940/7 on 21.6v, but it would be kinda high rpms at 49k rpm. That's about 10k rpm more than most would run their motors, but they are higher quality so it might be ok. I would wait to see what others say about this...
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brushlessron
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09.05.2007, 07:01 PM

Iv ordered from mike , 12 tooth pinon .
Guess im on the list with the rest of you guys ,
For a deasant controller to arive.
   
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BrianG
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09.05.2007, 07:03 PM

If you don't use reverse, the MGM is a top-notch controller...
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brushlessron
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09.05.2007, 07:08 PM

Wich model can handel 6 pole , how many cell ?
   
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jnev
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09.05.2007, 07:40 PM

It is the MGM Compro 160. Can run 18 cells or 6s lipo. Seems to run stone cold for most with it as well.


   
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