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Jun 18, 2012, 05:50 PM
Registered User
The smaller blades of a CS10 would be a lot more susceptible (and have) 'micro vibrations' flexing them, compared to the quite huge and hefty Wemo type. So even though the 10 blade's blade is lighter, and probably ends up the same "overall strength per blade per G" (hard to explain that aspect) that flex aspect would be the real killer helping the rotor explode sooner.

Also look at the moulding quality - or lack of - for the 10 blade. They need notable cleaning up of the moulding edges, or else there will be even much worse turbulence per blade causing flex. So for their very high end use you would want to be making a very clean, "perfect", blade. And then, you can't even balance them individually so unlikley to ever get true 'balance perfection' to remove all the 'non perfect blade created flex' possible.
But Changesun don't care.... why make 100% effort when you can do it quick and cheap and still does a great job for the majority of their market? And getting that last end of perfection, versus what they have done, would take multiple times the effort.... not just another 30% or whatever on top of what they do now, but 300% more effort or whatever.

Meanwhile, it is a far simpler job for the Wemo type rotor design.... thus they are very likely to be a way better rotor to get their highest possible RPM from. It is just a far far simpler cleaner design. Even supplied at a higher level of manufacture and finish too.
But I bet if Wemo made the efforts for a high blade count fan then they would do it 'properly' too. At $100 per fan.... not $15. And they probably have thought about it... and written it off as a waste of time I expect. (not enough market, too costly etc).

All in all it doesn't seem that important to be able to use a 70mm fan, with huge power, where a 90mm fits fine anyway. That is more of a costly, academic pursuit.
It would be interesting to see a detailed enough chart/curve, but I suspect output result is still a close match between Watts to Thrust between 70mm and 90mm anyway - or even in the larger fans favour.
Hmmm... better have a Watts per Thrust per Cost (including motor and batteries needed in that) chart....
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Jun 18, 2012, 06:24 PM
"LiPo-Blaster"
RugFlyer's Avatar
Quote:
Originally Posted by Extreme_RC
The wemotec Minifan rotor is a very different construction, GRP based molding not this carbon impregnated stuff. I already asked the factory about molding the 10 blader in a GRP material, time will tell if it is done.

I run the Minifan rotor at 56K+ with the old ARC2858 setup, and with the new 1W40 its running at 63K without issue, of course balance must be perfect. When I did destructive testing I had to take it well over 70K to explode it, saw over 3.5kg thrust on the stand before it blew, and it took 2 runs to blow it, very tough rotor.
Wow!
Jun 18, 2012, 07:41 PM
Suspended Account
Tam,

I was wondering if you could sell me some stators for your fans. I tried to reverse engineer your fan so I can copy it and then sell it off as my own, but was unable to salvage the stators since they break when I try to remove them since they are glued in to strong.
Jun 18, 2012, 08:37 PM
Registered User
Lol
(and ask what glue it is too)
Jun 18, 2012, 09:22 PM
Registered User
Got a few flights in on the HET 2w-30 with Extreme shaft adapter/spinner and my new 4000mah 6S nanotech. Power went way up over the old L2855 2300kv setup. Got 74amps and 1680watts, battery was 85% full.

The plush 60 is still hanging in, although it is starting to get fairly warm, and the motor came in at 190 degrees. Three minute flight used up 3000mah!
Jun 18, 2012, 10:01 PM
Registered User
ZACATTACK's Avatar
Quote:
Originally Posted by Super Matt
Tam,

I was wondering if you could sell me some stators for your fans. I tried to reverse engineer your fan so I can copy it and then sell it off as my own, but was unable to salvage the stators since they break when I try to remove them since they are glued in to strong.
Yeah.. Yeah.... send him the blueprints too Tam...obviously he cant design something with his own imagination so he has too copy designs of other hard working people...very creative..keep up the good work work Super Matt..you sound like a very intelligent guy!! Please post up some more great ideas we can all learn from..very creative!!
Jun 18, 2012, 10:29 PM
Registered User
Tamjets's Avatar
LOL....come to my shop and use my tool too.
Jun 18, 2012, 11:26 PM
Registered User
I suspect you missed the sarcasm and underlying reason of that 'stator post'.... not that I know it, but it seems only one possible reason. And who is Matt.... (or who is he really).
Jun 19, 2012, 05:46 AM
Aka: Tom Jenkins
ApexAero's Avatar
Thats like nicely asking Tam or E-Jets for permission to copy their product and them politely saying no...Matt was 6 of 12 out of the 13 total
Jun 19, 2012, 06:50 AM
Registered User
SKYRYDER1000's Avatar
Quote:
Originally Posted by Tamjets
Send to my shop.
Next week I can balance them.
This is a short week and I be on vacation with family.
No problem Tam. I will hold off until next week. Enjoy your vacation..
Jun 19, 2012, 07:25 AM
Registered User
Quote:
Originally Posted by nighthawk0077
Got a few flights in on the HET 2w-30 with Extreme shaft adapter/spinner and my new 4000mah 6S nanotech. Power went way up over the old L2855 2300kv setup. Got 74amps and 1680watts, battery was 85% full.

The plush 60 is still hanging in, although it is starting to get fairly warm, and the motor came in at 190 degrees. Three minute flight used up 3000mah!
hi, May i know what the AUW of your aircraft? and what is the thrust the 2W-30 produced?
Jun 19, 2012, 01:18 PM
Suspended Account
Quote:
Originally Posted by Tamjets
LOL....come to my shop and use my tool too.
I have Barry for that. Hahahaaa
Jun 19, 2012, 01:20 PM
I'm slow but I'm expensive
Ken Lilja's Avatar
All kidding aside, is there any on line or other information on stator design? I did a search on RC Groups and came up empty. Maybe I wasn't asking the right question. I am the kind of person that sometimes like to take the difficult path and roll my own.
Ken
Last edited by Ken Lilja; Jun 19, 2012 at 01:33 PM.
Jun 19, 2012, 01:32 PM
I'm slow but I'm expensive
Ken Lilja's Avatar
Does anyone know offhand how many poles the Cyclone Power 480-2500 and 480-2800 have? (for rpm measurement) I understand that it is equal to the number of magnets, or is it equal to the number of gaps between than magnets? I think that I would need to remove the back fairing to see the magnets.
Thanks,
Ken
Jun 19, 2012, 02:36 PM
Registered User
Tamjets's Avatar
Here is the video rotor give up.
Last night I ran another one in the shop to make sure that rotor give up over 46k rpm.
Sure enough it fail right after 46k plus.
So three out of three fail over 46k rpm.
It seen working flawless at 44.5k rpm for many flight we did.

Tam's F-100 2nd flight (0 min 41 sec)


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