Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Jan 01, 2013, 06:51 PM
midiman007 is offline
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That's really nice! What's the AUW w/gopro? Great scenery! Looks REALLY cold!
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Old Jan 01, 2013, 07:42 PM
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AUW with GoPro, FPV and 2200 mAh 3S battery: 674 grams

Actually it wasn't that cold. Around -4 degrees Celsius. Creeps down to -25 when it is really cold up in these mountains.

And today the weather was truly spectacular:
Spectacular Mini Octo WInter Flight (0 min 0 sec)
Old Jan 01, 2013, 08:56 PM
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Some more really good stuff. What a place to fly!

I'm planning a build using those motors. Do you like them?

Kenny
Old Jan 02, 2013, 05:27 AM
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The motors behave better than suspected @ 3S on this small octo. They have the usual weak spot where the wires enters the bell, but can be strengthened with some epoxy. Still, one of them have died because of a bad connection at that exact spot. Even with epoxy.

They're also vibrating quite a bit but I've made some of them better by balancing them.

And the jury is still out on the question of how long they will last @ 3S...
Old Jan 02, 2013, 02:27 PM
brontide is offline
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Stop me before I build again!
If you were not starting with a box of parts would you have chosen the 1811?

Thinking of something similar with the Sk3 2118 2750kV

http://www.hobbyking.com/hobbyking/s...dProduct=18133

Glad to see I'm not the only one using overlapped arms for the base structure. Super strong and super simple to build.
Old Jan 02, 2013, 04:00 PM
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Quote:
Originally Posted by brontide View Post
If you were not starting with a box of parts would you have chosen the 1811?

Thinking of something similar with the Sk3 2118 2750kV

http://www.hobbyking.com/hobbyking/s...dProduct=18133

Glad to see I'm not the only one using overlapped arms for the base structure. Super strong and super simple to build.
The Sk3 looks great. More powerful, slightly heavier, specced for 3S. Apart from the prop-saver. I hate those. Vibrations and slack... Any chance of another way to mount the props on that one?

But with those motors I would have built something slightly bigger with room for 5" three blade props.
Old Jan 02, 2013, 04:07 PM
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Stop me before I build again!
With 5" props you are starting to inch up the ladder, no way it would have worked on a 260mm frame. They also make the sk3 in a 3100kV variety, unfortunately I don't think it's possible to remove the prop saver.
Old Jan 02, 2013, 05:37 PM
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Yes. With 5" you would have to build it bigger. Quite a bit, actually. For the 4" props it seems like the 1811 copes well on 3S. And the Sk3 is 17 g each compared to 12 g each for the 1811. Giving you 40 g extra weight with the Sk3 on an octo.

Must admit that I have no idea if the Sk3 will give you more lift because of the bigger size for this small configuration.
Old Jan 02, 2013, 06:11 PM
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Once you get small its hit and miss with the calculators as well. I'll see if there is any good information on the blue wonder that I believe are the brand name of the 1811's.


Nm, those are the 24g turnigy not the 11g 1811.
Old Jan 03, 2013, 02:24 AM
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Hello! Nice build. I have ran that motor with no prop at 16V to test behaviour when the motor spins faster than the code has time to keep up with. There is a rev limiter to prevent loss, so it should be fine if a prop falls off. It's pretty cheap, but it works.
Old Jan 03, 2013, 11:13 AM
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That is pretty cool. I am amazed that such a small octocopter could carry a Gopro
Old Jan 08, 2013, 11:18 PM
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I really want to build one of these. Can anyone link a 4" prop that I can use for building this octo? Thanks!
Old Jan 09, 2013, 02:22 PM
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Quote:
Originally Posted by ver2go View Post
I really want to build one of these. Can anyone link a 4" prop that I can use for building this octo? Thanks!
I would like to know as well. Plus, the only Turnigy 1811 2900kv motor I can find is only rated for 2S. :|
Old Jan 09, 2013, 02:38 PM
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I'm pretty sure those are the correct motors. There is mention of they seem to be working fine on a 3S, but not sure of the life of the motors in doing so.

Quote:
Originally Posted by 5th View Post
I would like to know as well. Plus, the only Turnigy 1811 2900kv motor I can find is only rated for 2S. :|
Old Jan 09, 2013, 02:59 PM
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Stop me before I build again!
Since they can run on 3s ( others have done it, so the wiring will hold up ), you just have to be careful with prop size since you are already pushing the little motor pretty hard, the props should be small enough that it doesn't cause too much amperage, too much heat, too much stress on the bearings, or too much vibration.

I'm going to be trying one myself. Trying to decide between a traditional octo or a X8 at this point. If I go X8 I will probably do 5030 props.


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