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Old Feb 05, 2013, 03:22 PM
United States, TN, Decatur
Joined Dec 2005
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Maybe in a couple months they will come out with a (nano cpx bl) and have an even smaller brushless tail motor on it. Heh heh. 6mm?
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Old Feb 06, 2013, 12:04 AM
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Quote:
Originally Posted by dwayne loveday View Post
Maybe in a couple months they will come out with a (nano cpx bl) and have an even smaller brushless tail motor on it. Heh heh. 6mm?
hope so
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Old Feb 08, 2013, 01:58 AM
TheyreComingToTakeMeAway!
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USA, ID, Coeur D'Alene
Joined Dec 2003
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there was once a 6mm brushless motor, it was an amp hog from what i recall, maybe if done by Blade it could be higher quality.
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Old Mar 16, 2013, 01:41 AM
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United States, CA, Los Angeles
Joined Mar 2005
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Hey Nitro, any progress on this neat little motor fan combo you are brewing up!
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Old Mar 16, 2013, 04:13 AM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
11,254 Posts
I did try the UM gearbox setup for props along with Valiant at one stage.

I am back focusing on using it in a fan and have decided to try something I have wanted to try for a long time with micro EDF's... here's a little taste...


.
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Old Mar 16, 2013, 07:57 AM
Montreal, QC, CANADA
Joined Aug 2008
821 Posts
belt drive?
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Old Mar 16, 2013, 08:57 PM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
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That's the plan.
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Old Mar 18, 2013, 10:27 PM
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Quote:
Originally Posted by NitroCharged View Post
That's the plan.
pretty.

would it need to be a toothed belt (if at all possible at that size) to minimise slippage at high RPM?
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Old Mar 19, 2013, 12:21 AM
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United States, CO, Westminster
Joined Jul 2011
575 Posts
The toothed belt would add to much resisstence and slow it down more then it would slip and trying to find one this size would be almost impossable. Thats my guess

I had this idea a year ago i have a picture of it in my attachments but i never di anything with it. This will help out alot with those 24mm and under fans
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Old Mar 19, 2013, 05:47 AM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
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I think smooth will be fine for testing Jim.
Chester - I've had this idea for some years too. I also have delayed following it up until now .

So the concept is this(ready for print): We free up an extra 8.66mm˛ of fan area inside the case allowing for that little bit more thrust the motor and mount would otherwise block. I have several sized motor pulleys to find out what load the inrunner can take.
.
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Old Mar 19, 2013, 07:14 AM
Life begins at transition
Australia, VIC, Sale
Joined May 2007
3,593 Posts
Um, NC? Not original research, so don't shoot the messenger, but my texts all recommend more using a hub less then 30% of the fan diameter, even for low pressure fans...
My concern would be the roots of the blades would be stalled (and potentially even in reverse flow) rather than adding anything.

But hey - if it works, you'll certainly have a unique jet!
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Old Mar 19, 2013, 04:51 PM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
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Ody, it's at 26.31% at the moment. If I increase the hub diameter by 0.7mm it will be at 30%. Worth doing you think?
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Old Mar 19, 2013, 06:53 PM
Life begins at transition
Australia, VIC, Sale
Joined May 2007
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Don't really know. I can't find any explanation apart from root stalling for why 30% is the "magic number". The trend of higher pressure - bigger hub is pretty rigid, and it sorta lends itself to the same idea of stalling.

Are you planning on this thing running to the ragged edge, or more of a cruiser? It might do really well until the roots stall, so a good indoor one, but no good at high power?
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Old Mar 20, 2013, 02:23 AM
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United States, OH, Dayton
Joined Apr 2004
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Cool design NC! Maybe you could use those tiny rubber bands from the orthodontist office to act as your pulley?
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Old Mar 20, 2013, 09:02 PM
Team30 Micro EDF
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Adelaide, Australia
Joined Apr 2004
11,254 Posts
Ody - I went for it and adjusted the parts so it's done and uploaded now.

Thanks pdawg. I plan to use o-ring's as they make for good belts on small projects.

If anyone else wants to join in on the experimenting - the parts are here: http://www.shapeways.com/model/98546...ductBox-search

You'll need:
1.5x4.0mm bearings, a 1.5mm shaft for the rotor and a brass end stop(scrounge a 5g HK outrunner for all the parts) and some o-rings.
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