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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  
 
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.

 
			 
			
					
				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... 
 
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... 
 
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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