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1S LiPo equivalent to 4 Cell NiMH

Posted: Wed Mar 11, 2009 10:49 pm
by Hail Ming
Just found this product on Novak's website...

http://www.shopatron.com/product/part_number=5474/135.0

due to be released later in March.

With the BRCA annoucement regarded approval of 1S LiPo from April 2009 (see link)

http://www.brca.org/BRCA/elecboard/news ... %20pdf.pdf

This might be what everyone currently running 4 cell NiMH has been waiting for :wink:

What do you reckon?

James

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 12:15 am
by Gazza
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Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 10:24 am
by JamesG
That is for boosting the voltage to your radio gear so that it's running at 6 volts, if you try running your esc and motor through it I doubt it would last very long, those wires are very small.

Image

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 7:43 pm
by Hail Ming
Hi James,

Yes I know...perhaps I should have made myself clearer. The issue with 1S LiPo is the voltage for running the electrics - this gizmo will solve it.

As for the voltage to the motor, that shouldn't be a problem provided the club allows lower turn motors.

For example:

A 5.5T brushless motor kicks out about 420W from a 7.2V pack - now if you recall your Physics lessons at school you'll know that power = voltage x current. For the purpose of this example let's ignore the variation of motor efficiency with voltage and assume the load on the motor is the same - therefore halving the voltage will also halve the power output.

That being the case...210W will be more than enough to run a V12 or 1/12th pan car.

Hence my post...

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 8:50 pm
by JamesG
Ahh I follow now, these could be useful in making the move to the new cell technology then.

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 8:57 pm
by Hail Ming
Exactly... :D

Finding decent 4 cell NiMH packs at a reasonable price is difficult...in comparison LiPos are readily available and cheap.

Just wondering what everyone else thinks...perhaps something for the autumn season.

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 10:52 pm
by Richie
Hi James

If the justification is cost, why don't we just run a 2 cell lipo, these are commonly available, cheap to purchase, and we don't need a booster card.

we can then use existing motors, electrics, etc, etc. Didn't someone once say "lets keep this simple".

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 11:03 pm
by Hail Ming
Hi Rich...

Yes I think that was Gazza... :wink:

Unfortunately I don't think 2S will fit in a pan car...but that might be the way forward for Mardave...certainly would be quick. I remember running the original mini stock outdoors at Coventry GEC Sports Ground with 7.2V packs...great fun.

James

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Thu Mar 12, 2009 11:50 pm
by Gazza
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Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Fri Mar 13, 2009 7:50 am
by Richie
OK the 7.2 1800 lipo's we tried at xmas were cheap and very good but wern't hard cased, we should stay well clear of these, however I did hear I think Bob Burr say that someone has done a hard cased 7.4 lipo for a Carisma. If we can find the size of these they may fit a mardave and that could be a way forward.

Re: 1S LiPo equivalent to 4 Cell NiMH

Posted: Sun Mar 15, 2009 10:44 pm
by Gazza
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