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Jul 16, 2012, 10:52 PM
jbc
jbc
WHO's your DADDY!!!
jbc's Avatar
I heard Jim's zephyr and was VERY surprised how nice it sounded for a stock hobby king combo (balanced, whooshy and smooth), closest sound I've heard to a CS10
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Jul 17, 2012, 09:16 PM
speeddemon
What battery connector does the Turnigy Brushless ESC 85A w/ 5A SBEC have?
Jul 17, 2012, 11:20 PM
Registered User
Probably none.
Jul 17, 2012, 11:34 PM
Registered User
has anyone thinned the blades on this fan not in thickness but in cord tapering to the tips to have the same sound but in lower power applications?
Jul 18, 2012, 12:28 AM
Registered User
Phew, that blade 'adjusting' would be a tedious task to do!! And quite hard to get them all accurate.
Some form of CNC machine? LOL.

I have to think harder about it, but a quick think I would suspect you may as well leave them as they are and just run a different lower power setup on it anyway.....??

Hmmm... less total area.... less load....prob higher RPM.... probably would be some technical load difference.....
Jul 18, 2012, 12:31 AM
Registered User
anlucas's Avatar
Quote:
Originally Posted by airraptor
has anyone thinned the blades on this fan not in thickness but in cord tapering to the tips to have the same sound but in lower power applications?
I think I may have an answer for you.

I 've got a couple of rotors with one broken blade. I will break another one(opposite) to make them 8 blades. That should give lower power....

I hope to do it over the next 2-3 days.
Jul 18, 2012, 02:12 AM
Big gov never Works
St. Martin's Avatar
......
Last edited by St. Martin; Jul 25, 2012 at 04:27 PM.
Jul 18, 2012, 02:18 AM
Registered User
3 from 5... doesn't sound like it would come out very balanced. Dynamically, or aerodynamically. ??? ( a 4 from a 6 maybe?)
Jul 18, 2012, 02:22 AM
Big gov never Works
St. Martin's Avatar
......
Last edited by St. Martin; Jul 25, 2012 at 04:27 PM.
Jul 18, 2012, 02:50 AM
Registered User
hehe. The rest was fine.

Take two off the CS10.... 8 blades, and might have a good, or bad, side-effect off the "gap" to the output sound.
Even taking off 4 and going to 6 could have its own unique sound compared to 'normal' 6's.
But for lower blade count you either need more RPM to get the same thrust, or just use it for a lower power output (weaker drive system). And I guess there is a bit of upside leeway to RPM in most typical users cases.

I guess there is a chance that doing this idea could give a still nice sound, for that lower torque input needed.
I am not breaking any of my CS10 blades off to find out though!! LOL
Jul 18, 2012, 03:24 AM
Registered User
anlucas's Avatar
Quote:
Originally Posted by PeterVRC
I am not breaking any of my CS10 blades off to find out though!! LOL
Mine are broken by accident. I actually threw them in the bin but retrieved them a few days later after an overnight bright idea on what to do with my high kv motors. Some motors are useless with the 10blade because they draw too high a current. With 2 less blades though or 20% less load - who knows.

If it doesn't workout then fine. But if the sound is not different then I may have found a way to reuse stuff....

That's who gave me the idea.... Knife!

https://www.rcgroups.com/forums/show...postcount=3407
Last edited by anlucas; Jul 18, 2012 at 03:35 AM.
Jul 18, 2012, 04:19 AM
Lee Liddle
Knife Liddle's Avatar
Quote:
Originally Posted by anlucas
Mine are broken by accident. I actually threw them in the bin but retrieved them a few days later after an overnight bright idea on what to do with my high kv motors. Some motors are useless with the 10blade because they draw too high a current. With 2 less blades though or 20% less load - who knows.

If it doesn't workout then fine. But if the sound is not different then I may have found a way to reuse stuff....

That's who gave me the idea.... Knife!

https://www.rcgroups.com/forums/show...postcount=3407
When I ran the 90mm-12 as a 10blade I didn't notice much diff in sound, if any. Unfortunately with the 10 blade you don't have as many options for blade count as with the 12 blade but 8 should work well and sound similar. Maybe you'll be able to hear it in the air. The 70mm-10 is almost silent in some jets.
Jul 18, 2012, 10:53 AM
Registered User
well i was looking to keep all ten blades. I was given two GWS me 262's (dont laugh) lol. i was thinking of using these fans on a low power set up. this way i would have that high edf whine but more of a whoosh. now a lower power will have less rpm which means the whoos will go away and more of the whine will be back. so to get the rpm up with a low power set up is thinner cord wise blades. i think it will be easier then you think. i just need to order some fans and extra rotors to mess with.
Jul 18, 2012, 11:54 AM
EDF rules... :)
AirX's Avatar
Quote:
Originally Posted by airraptor
well i was looking to keep all ten blades. I was given two GWS me 262's (dont laugh) lol. i was thinking of using these fans on a low power set up. this way i would have that high edf whine but more of a whoosh. now a lower power will have less rpm which means the whoos will go away and more of the whine will be back. so to get the rpm up with a low power set up is thinner cord wise blades. i think it will be easier then you think. i just need to order some fans and extra rotors to mess with.
No, the woosh will be less and the whine will be less as rpm goes down. In my tests I have found the fan is much quieter with 3s than 4s in all regimes.

I also think that the fan is not suited to less blades, it already shows a lot of loss at mild changes in outlet area with all the blades present.

Eric B.
Jul 18, 2012, 02:19 PM
scunna
scunna's Avatar
Have you checked this out. Been around for a while, exellent for bancing fans.

bobs workshop EDF fan balancer (0 min 54 sec)


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