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Other than the big cat to build I have all my boats and heli's running for the first time all at once. My SV was running a CC80 watercooled and Fiegao 8xl powered by 3s 20c 2p with a m43 carbon prop. INSANE speeds but I swelled a lipo and scorched the CC80. Now I am running hxt120 watercooled 8xl and 2s 15c 2p batterys. What I wonder is if it will draw that many amps since it will be 7.4v less? so does decreasing voltage also decrease amp draw? Also I could reduce prop size but being less load wont that increase amp draw at a point? Thanks for any help and advise.
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I dont know if im 100% right on this but it should be less amp draw with using the same prop. When you are decreasing your voltage then your amp draw will also drop but you can counteract it if you use a larger prop.If you drop the size of your prop then it will be less current. I think. tell me if im wrong.Last edited by mike a.; 10-02-2007, 07:45 PM. -
thats exactly what I wanted to hear if correct. however I am cautious again because the temps were too hot to handle using that prop. I know the amp draw killed my batts cause they were only 2100Mah = only 62amp constant.Comment
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I think your running to close to the max continuous current of the cells. Some of the ratings are not correct. I have been following the race guys and running at 70% of the max rating with good results.Steven Vaccaro
Where Racing on a Budget is a Reality!Comment
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Mike the 12-16c s2 Polly Rc packs Mr Hill has at Battlepack are ok to run in a s4-2p configuration. I got away with it for a few months in my stock sv on a k45 prop. Steve had mentiond to me once they where under rated in mah. I was pulling 40 to 60 constant out of them. Keep in mind I had a stock setup. You need to calculate your draw and go from there.Comment
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Mich,
If you increase voltage, the same motor with the same prop will draw more amp, just because you will spin the prop faster,
The problem is that if you decrease voltage, your boat will certainly move slower because the amount of power is smaller than at higher voltage
I don't want to go too deap in detail but if your setup drain 80amp under 11.1V (23132rpm) this means you are pulling 888Watts, if you go down to 7.4V (15421rpm) your amp draw will certainly drop down below 50amp so the power will be around 400Watts
Will this amount of power at this given RPM be enough? that's the question!Comment
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kiss mine
If you want to cover your assets you can kiss mine !
hahaha.
Sorry i just had to. any way back on topic:)
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Yeah Eyekandy I wouldnt expect anything less from ya! just kiddin. Thanks for the advise gents. always appreciated. I have an idea where to re-start tuning this one now.Comment
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Ok, since we are on voltage/battery talk, can anyone help me with this. If you run 2 2s 15c 3200Mah lipo's in parallel will amp supply raise at all or will it still be the same as just one? Basicly id like to just buy four packs run two parallel on each side. the run those in series. jeez can that even be done?Comment
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the amp supply will be raised because you are doubling your Mah.
so it will become a 2s 15C @ 6400 mah
so you will have a total of "103.5" ampsComment
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You can draw 48 amps constant out of those packs @ 15c. Parallel them and you can pull 70 to 80 amps with out a problem. I would suggest you not plan on pulling 96 amps constant out of them. You need to account for any discrepancies in the ratings, witch can be conmen with lower cost/c packs.Comment
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NICE!. thanks eyekandy! but what a messs the wiring will be. That will be nice and safe all around. I am hoping to only draw around 60amps.Comment
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lol Taylor you beat me to it. As you can see I am more conservative with my advice. I don't want a " HEY you said I can" commin back on me
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yeah sjfe i dont wanna swell anymore packs or blow esc's. those packs were only on sale till today. darn 42.00 each. now they are 79.Comment
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Yeah i said it in "quotes" the amp draw. You are correct pulling at much is just stupid.
A good practice is to pull have of the advertised C rating out of the packs.
just to be on the safe side.
And its not to messy. it is done as regular practice ( lets not debate 1p 2p)Comment
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