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What can I expect?

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Old 10-22-2004, 05:39 PM
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Crazyrcer
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Default What can I expect?

I'm thinking about converting a Hobbico Avistar or SuperStar to brushless. Would an AXI 4120/14 on 12 GP3300 be enough to fly it? What kindof runtime should I expect? What kidof performance should I expect?

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Old 10-22-2004, 09:41 PM
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jonnyjetprop
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Default RE: What can I expect?

Let me answer this two ways.

I had an avistar that used a Jeti Phasor 30-3, a thunder power 3s4p battery, and an apc 11x5.5 prop. This combo was putting out about 420 watts. It flew the plane well at about 3/4 throttle. I'm an experienced pilot. (I won't mention the tree that hit the model, but that's another story) I was looking for sport areobatics and I was satisfied. No one would mistake this for an extra 300 either.

What kind of performance are you looking for? Training? Aerobatics?

I don't know the weight of the plane, but I know that it was at least 5 lbs. I did fly it a couple of times on a 10 cell 3300 gp pack. This added weight did affect the performance.

As for the AXI, I don't have any real life data, but the manufacturer gives us this data:

http://www.modelmotors.cz/index.php?id=en&nc=produkty_vypis&kategorie=m_neodym_ac&id_rady=axi_41&id_produktu=axi_4120_14&nazev_rady=Series%20AXI%2041&hmotnost_rady=(320%20-%20409%20g)

12 cells

12x8 28.6A 373 watts
13x8 30.8A 397 watts
12x9 30.8A 397 watts
13x11 37.7A 472 watts
14x9.5 43.5A 526 watts
14x10 49.5A 581 watts

I'd go with the 13x11 prop. This would give you better performance than I got. The first three props would not be my first choice, but you could try them latter. The last two I'd shy away from because they are pulling too many amps. The motor is rated for 40 amps continuous, although others would use it and use throttle management to keep the amp draw in line.

How long will it run. 3300 mah is 3.3 amps per 60 minutes, 33 amps for 6 minutes, or 66 amps for 3 minutes. This means at 40 amps (full throttle) you'd get just about 5 minutes or about 7 or 8 just cruising around.

Hope this helps.

John
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Old 10-23-2004, 11:06 AM
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StephenT
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Default RE: What can I expect?

crazyracer


JJP has given you the best advice for a Avistar conversion. I did nearly the same thing 2 years ago with the JETI 30-3 motor and 10 or 12 cells. I also gearboxed it. If you gearbox the JETI 2:1 w/a Greatplanes electrifly GB for $12.99 from Tower (5 mm pinion extra), and use 12 cells your Amps are less and you fun lasts longer. The JETI motor is limited to a 2:1 gear ratio. I agree it doesn't look like a Extra 300????
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