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01-25-2011, 09:17 AM | #41 | |
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Re: A123 With No Regulator
Quote:
you might want to go with a more scientific approach as stall torque would vary with voltage applied to the motor and an eagletree logger is not the most accurate
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01-25-2011, 10:59 AM | #42 |
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Re: A123 With No Regulator
mister moo
well i understood it from the get go, ya explain something here and it is sorta laughed off. i know what ohms law is and a few other formulas too. im not a genius and dont take one to figure out a lot of things. if he could have explained it why didnt he robert |
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01-25-2011, 02:18 PM | #43 | ||
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Re: A123 With No Regulator
Apart from volksman, two others said it well too.
Quote:
Quote:
power (watts) = volts x amps the power needed for a flight is a constant. Therefore if the volts go up, the amps go down. |
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01-25-2011, 04:43 PM | #44 |
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Re: A123 With No Regulator
Haven't read the whole thread, but wanted to share that I've been running 2x 2300mah A123 packs through the Fromeco wolverine to redundant RX connection unregulated perfectly on my 30% Edge 540T this past year. Works amazing! These are the cheaper Power HD 9150's all around, and the 090 on throttle. 6.6V solid with nearly any sort of load.
I also run an 1100mah A123 on my rcexl ignition, with 2 diodes in series on the + line. Works perfectly, and pulls the voltage down to 5.2V while running with much less worry of them ever dying than a standard voltage regulator... I like them because they're safe, 6-15min charges, chargeable in plane, last forever, never lose much mah capacity (even after months of sitting around), lightweight, provide huge current, and I build my own packs for under $11.50each. I see no downside! IMO, A123's (along with lipo's and DL engines) are one of the best things to ever hit this hobby! Egan
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01-25-2011, 05:03 PM | #45 |
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Re: A123 With No Regulator
As an aside, most people aren't aware of this, but rc-exl ignitions that were manufactured before 10/2007 need to worry much more about over-volting their ignition past 6.0V. Any rc-exl ignition manufactured after this date are designed to handle 7.4V without failure.
I spoke with Tired Old Man (TOM) as he's been working on these gas engines and ignitions for more years than most of us have been alive and he let me in on this little secret. Not sure why rc-exl doesn't publish this information, but I trust his experience on this. Now, even I still diode drop the voltage down just for safety-sake and because it's simple and costs me less than $0.10 to do so, so why not I figure. You gain nothing by running voltage over 4.8V, so why bother. All it does is create unnecessary heat and stress. Despite this, it sounds like it's ok to do so, regardless. Just check with your engine manufacturer as they may void the warrenty if you're over the 6.0V "published" spec. Just a tid-bit of info for those of you who didn't know. Egan
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