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Electric Stunt => Gettin all AMP'ed up! => Topic started by: jim gilmore on September 30, 2009, 10:19:43 AM
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Ok, I'm building an .10 powered 1/2A pathfinder.
I'm interested in electric at some point and cost is always going to be an issue.
So lets say I wanted to try test stand engine set-up. What all would I need and what would be a low cost setup.
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Check out Dennis Adamisin's post just below.
http://stunthanger.com/smf/index.php?topic=14109.0
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At this point there is incomplete info there to decide what one needs.
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At this point there is incomplete info there to decide what one needs.
I am sure he will fill it in!
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At this point there is incomplete info there to decide what one needs.
...and for that I apologize. I expect to post the complete set-up BUT if I do that now it will be missleading - it ain't right yet!
I have only had the bird out one time, results are promising but inconclusive. Propellor effectiveness was WAY lower than predicted, upsizing the prop pushes me up TWO sizes in battery.
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how about more blades?
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Jim,
What do you want to fly and how do you want to fly it? I have several different options and just need specific info to guide you to what you will need. I flew the X-Wing on a $5 Emax 2805 2800KV using a $8 Tower Pro ESC and $8 Zippy 1300 20C 2S pack. It turns a 5 x 3 Cox 3-blade @ 12-13,000 rpm @ 13 amps. I charge the 2S packs 2 at a time on a Hextronic 8080 charger that cost $27. All this is available through Hobby City.
Now if you put 3S 1100's on this motor, it will turn a 4.7 x 4.7 @ 18-19,000 rpm @ 19 amps. This would make screamin setup for a 1/2 A combat model on either 35' or 42' lines.
Another option is to use a 2040 inrunner with whatever Kv suits your specific needs. They offer them in 2080, 3500, and 4850. I have a 2040 2080 Kv & a 2040 4850Kv. I use the 2080 Kv in a Speed 400 racer on 3S and fly on a 5.5 x 4.5 prop @ 13,000 rpm pulling 12 amps static. I use the 2040 4850Kv motor in a EDF on 3S and it absolutely screams at close to 50,000 rpm. I ran it up on a 4.1 x 4.1 on 3S and it was screaming and pulling 25 amps. Not sure of the rpm but it was around 30,000 by sound.
In-runner by nature will be more efficient, but are a bit heavier in an oz/watt out comparison. The Emax 2805 2800Kv weighs around an oz and complete with battery and ESC you are looking @ 5.5 ozs total ready to put in an airplane.
Archie Adamisin
Muncie, Indiana
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Here are some test numbers and some pictures of the Emax that was tested.
Emax 2805 2800Kv
3S 1050 20C Rhino Li-Poly
APC 5.25 x 4.75 Prop @ 17,500 pulling 17 amps
3S 1050 20C Rhino Li-Poly
Cox 5 x 3 (3) blade prop @ 16,500 pulling 18.5 amps
2S 1300 20C Zippy Li-Poly
Cox 5 x 3 (3) blade prop @ 13,250 pulling 13 amps
Picture shows set-up as pulled from the X-Wing Fighter. It has a Will Hublin FM-0 timer and Tower Pro 18 amp controller.
Archie Adamisin
Muncie, Indiana
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Here are some number for the Turnigy 2040 2080Kv motor on 3S Rhino 1050's
Archie Adamisin
Muncie, Indiana
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Not sure what exactly an X-wing is except for star wars ? Size weight line length ? how about a photo ?
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See this thread.
http://stunthanger.com/smf/index.php?topic=14264.0
Archie Adamisin
Muncie, Indiana