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Old Aug 19, 2014, 01:27 PM
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30 mm Fan Test Results

Hi, I thought I'd post my early test results in a new thread. My first thread was about designing and printing out a test stand and custom fans. I've always been fascinated by EDF and micro's in particular so when I saw Meerkat's Hunter thread and his high tech approach I thought I have got to give this a try. I'm a retired Senior Designer from Ford and have years of experience in various CAD programs.
Based on what I've read the HyperFlow fan looked like a good design to start with. My goal is to equal or exceed its performance.

This is my first 'go around' at this this so every step is a new experience.

This is my setup :

SMC 2s 4600mah 70c 'shorty' battery
Neu 7300Kv and 4000Kv motor
Ammo 11500Kv
CC Talon 25 amp ESC

Blades............. A.............. V.............W............... T ...................G/W
___3________4.83 _____7.95____37.8______70__________1.85********* HyperFlow Fan........... ?P/D.........Ammo 11500Kv............2S

___3________2.12______8.11____17.1______42________ __2.45*********HyperFlow Fan............?P/D............7300Kv........2S

___3 _______ 3.27______7.88____25.8______60__________2.32****** *** Version 1 Fan..............1.5 P/D........7300Kv......2S
___5________ 3.68______7.80____28.3______64_________ 2.26
___7________3.84______7.75____ 29.6______62_________ 2.09

___3________ 4.74______7.82_____33.2 _____69________2.07 ********** Version 2 Fan..............2.5 P/D.........7300Kv......2s
___5________5.34 ______7.74_____ 41.6_____ 78_______1.87
___7________5.65_______7.70_____43.2_____80_______ 1.85

___7________3.05_______11.75_____35.4____72_______ _2.03***********Version 2 Fan..............2.5 P/D...........4000Kv.....3S


My next step was to design a version 3. I sent out 7 new designs to print and hopefully I should have them by the end of the week.
Fingers crossed ....
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Last edited by jumo004; Aug 19, 2014 at 02:25 PM.
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Old Aug 19, 2014, 02:28 PM
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This is the link to my test stand thread :

http://www.rcgroups.com/forums/showthread.php?t=2174076
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Old Aug 20, 2014, 03:21 AM
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Nice Barry

Did you take any pics and how did the rotors hold up?
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Old Aug 20, 2014, 09:10 AM
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I'll take some pics of the fans (sorry I only have a camera phone).

The fans held up really well to my surprise, maybe because I'm only running them on 2S ? They require very little clean up and seem to require very little balancing.
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Old Aug 20, 2014, 11:55 AM
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Here's some pics and some CAD screen shots which show the fans in comparison.

The 2.5P/D had better numbers and it's obvious why ...

Still not happy with the performance, got some more stuff to try ...

Thanks.
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Old Aug 21, 2014, 11:58 AM
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Those rotors look great!

I really like how you have overlayed your CAD models to show the difference in P/D. Looking forward to seeing how the new rotors perform.
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Old Aug 21, 2014, 10:42 PM
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I am looking forward to seeing your results! Don't forget the stators, different pitches on the stators can greatly affect the overall fans efficiency.
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Old Aug 22, 2014, 08:17 AM
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I like the coarse pitch....good for speed
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Old Aug 22, 2014, 10:05 AM
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Quote:
Originally Posted by danj31 View Post
I am looking forward to seeing your results! Don't forget the stators, different pitches on the stators can greatly affect the overall fans efficiency.
yea the stators .... another whole new world to explore ... LOL. I have some pipe dreams .... but for now I going to stick with something simple.
These ducted fans are so complicated and involved with math, theory and black art that for me leaves my brain spinning faster then any EDF I've ever seen ... lol.

I'm using the 'shot gun' approach. Throw everything I got at it and see what hits.
It's not very scientific but it allows some fun to be part of the work ..... anyway .... this is what I'm using at the moment ...

btw, any comments or suggestions would be welcome.

Thanks.
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Old Aug 25, 2014, 01:01 PM
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Wanted to try a longer inlet and outlet along with some new design fans.
Everything came in good except the inlet ................

Thanks UPS ...
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