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Home✈️Aircraft🚁Helicoptere-Century Radikal E640 - Swift 16 NX › Swift 16 setup and battery questions
04-23-2009 03:21 PM  10 years ago
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mxerman

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Montgomery, AL USA

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Swift 16 setup and battery questions
OK I am thinking about a Swift 16. I am an old plank flyer but only been flying helis for about a month. I have a TRex 450 and can hover real well. Forward flight is just beginning... Lets just say I wont be doing any 3D soon. I have been flying electric planes and my TRex with 3S about 2000mah lipos. I have a bunch of them. I also have some 4s 2300 A123 packs and a couple of 2s A123 packs. I would like to setup the swift so I can use them if possible. I know that a 6s series lipo would work but 2000mah is not going to fly long. Do you think that I could get a motor that would give enough head speed on 3s in parallel so I would have 4000mah. Or how about the A123's. What motor, speed control, pinion, etc... You see where I'm going with this? What do you think. Thanks, mxerman...
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04-23-2009 04:52 PM  10 years ago
imnxtc

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BC.Canada

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The biggest problem with using A123 packs is their voltage drop when used at the relative high workload of turning a 520mm rotor at reasonable rpm.

They will only deliver 2.8V (not their advertised 3.3V nominal rating) when driving such a rotor. On the other hand a 25C type LiPo will deliver the rated 3.7V per cell.

So your 6S A123 pack will only deliver 16.8V until it has been run long enough to drain about 1900mah. So it would perform about the same as a 2500mah 4S lipo of 25C. And it would be a lot heavier. In both cases you would heave relatively short flights even if you are geared to turn at a relatively low 1500 or so rotor speed.

Of course making up a 6S/2P pack of A123, will give you double the flight time, you will still have a relatively low voltage.

Of course you could use 8 or 10 A123's in series, using a HV ESC and a lower KV(500 to 900)motor designed for higher voltages in order to develop the same watts (about 400) to fly it. The extra weight is a considerations, but the relative larger disc of the Swift handles the weight quite well.
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04-24-2009 08:03 PM  10 years ago
Pistol Pete

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Seffner, FL

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For starters you will be very pleased with going to any larger electric heli.

Unfortunately your batts are not large enought to get a worth while flight...maybe three minutes depending on overall setup. They will be great for setup before placing blades on.

Im getting about 10 minutes of mild acro out of a 5S FLIGTMAX 15C 5000ma using the 80% rule or 4000mA (from hobbyking) but treating them like 10C with occasional peaks at 45Amps using stock 520 blades.

Head Speed = 1650rpm.
~~Enjoying the hobby one flight at a time~~
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04-24-2009 09:08 PM  10 years ago
wrathofkhan

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LA, CA - US

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For power to weight ratio lipos are your best bet. I have flown the Swift 16, with 4s-6s over the past couple of years (with different pinion/motor combination).

For about year and half, I have converted exclusively to a123 (10s) setup. My reason for shifting over was 1. safety, 2. durability and 3. price (although these days you can pick up lipos at a very reasonable price).

The 10s I have is quite powerful, but only lasts about 5 minutes. Flight time does suffer when you use a123s, and that might be a big disadvantage for a new heli pilot since he/she needs more stick time to get over the initial hump/s of the learning curve.

cheers, Khan
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04-24-2009 09:18 PM  10 years ago
CompyMike

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sacramento, ca

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But the A123 pack will charge back up alot faster than a Lipo right? So you would be ready to go out to the flight line alot quicker. You would probably need 3 to 4 lipo packs to get that kind of turn around.
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04-24-2009 09:24 PM  10 years ago
wrathofkhan

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LA, CA - US

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ya, i forgot to mention the other big advantage of the a123s, fast charging ....

problem for me is that, i have a schulze charger (max at 3.7amps for 10s), and a xtrema charger (4amps max on 10s). so, it still takes about 30-40 minutes to fully charge at the field. the other issue is that the power supply at my field is not that good, it can not really supply power to both chargers at the same time - charging 10s setup. we end up using the generator

BUT, on my little trex with 3s setup - the a123s are really working out well. i can fast charge two packs at a time (using both chargers) - within 10 minutes. i have four 3s packs. i can pretty much fly continuously - charge two packs, while i fly the other two, by the time i am done with the first two packs - the other two packs are ready to go (people at the field don't like it too much though ... lol)

khan
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