LiPoly Voltage Queries
11-28-2002, 05:31 PM
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LiPoly Voltage Queries
Hi all, just before I begin I'm new on this board so bear with me.....
I'm an engineer researching micro unmanned air vehicles in the UK and am very interested in LiPoly technology. The trouble is, I have no experiance in elecrically powered RC aircraft.
The aircraft I'm looking into will be a classical design that has an MTOW of 0.4Kg and a span of 37cm
If anyone out there could answer a few of my questions, I be really gratefull:-
1. Are there any motors that are in exsistance that will run with a single LiPoly (say a KOKAM 3270) that have an LVC and BEC that is appropriate for 3.7V ? (the aircraft is a slow low performance design that will be launched mid flight from a larger UAV)
2. Would two KOKAM 3270's run together to provide the current and voltage requirements for an ASTRO 020 (the 020 requires approx 7V and 10-20A) and has a BEC @5V.? (again, bear in mind the aircraft is a slow and low performance - I need endurance and not speed)
3. Can the LiPoly batteries be charged in paralell and if so, can anyone recommend a charger that will do the job and is as idiot proof as possible?
4. If the astro 020 is not appropriate, can anyone recommend a motor that may be better suited to both LiPoly's and what I'm doing?
Thanks again,
Paul Haworth
I'm an engineer researching micro unmanned air vehicles in the UK and am very interested in LiPoly technology. The trouble is, I have no experiance in elecrically powered RC aircraft.
The aircraft I'm looking into will be a classical design that has an MTOW of 0.4Kg and a span of 37cm
If anyone out there could answer a few of my questions, I be really gratefull:-
1. Are there any motors that are in exsistance that will run with a single LiPoly (say a KOKAM 3270) that have an LVC and BEC that is appropriate for 3.7V ? (the aircraft is a slow low performance design that will be launched mid flight from a larger UAV)
2. Would two KOKAM 3270's run together to provide the current and voltage requirements for an ASTRO 020 (the 020 requires approx 7V and 10-20A) and has a BEC @5V.? (again, bear in mind the aircraft is a slow and low performance - I need endurance and not speed)
3. Can the LiPoly batteries be charged in paralell and if so, can anyone recommend a charger that will do the job and is as idiot proof as possible?
4. If the astro 020 is not appropriate, can anyone recommend a motor that may be better suited to both LiPoly's and what I'm doing?
Thanks again,
Paul Haworth
11-28-2002, 05:59 PM
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LiPoly Voltage Queries
If haven't already done so I would suggest also checking out http://www.ezonemag.com There are a couple of articles over there and the discussion groups have hundreds of threads about Li-poly batteries.
Steve
Steve
11-28-2002, 06:22 PM
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Thanks Steve, have tried trawling the internet for hours, there's so much information, and yet I still don't know If I buy this combination of equiptment if it's going to blow up or work.
11-28-2002, 09:57 PM
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Always a problem when you're on the frontiers of modern technology. The use of Li-poly cells for high current applications is fairly new so people are still trying to see what works. I've only tried the little ones (140mAh) for indoor flying so far and they're great.
When it comes to the bigger stuff there are very few motors and particularly controllers for them yet. Everyone is very used to 1.2V cells so these odd 3.7-4.2V things are confusing. I'd guess you'll need at least 2 cells, possibly 2 or 3 parallel sets of 2 cells, for the current draw you're talking about. NiCd or NiMH will probably be better for what you need.
Steve
When it comes to the bigger stuff there are very few motors and particularly controllers for them yet. Everyone is very used to 1.2V cells so these odd 3.7-4.2V things are confusing. I'd guess you'll need at least 2 cells, possibly 2 or 3 parallel sets of 2 cells, for the current draw you're talking about. NiCd or NiMH will probably be better for what you need.
Steve
