Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Jul 21, 2014, 05:39 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,462 Posts
Nothing wrong with 64mm in 10b or 12b if the 70mm rotor is cut down My 65mm Extreme Alloy fans perform very well, certainly not far behind a cut down wemo PRO in speed at all.
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Sign up now
to remove ads between posts
Old Jul 21, 2014, 07:20 PM
Registered User
Madison, MS
Joined Oct 2006
709 Posts
Looks like Hobbypartz has some 64mm edf's. Not sure of the quality though.

http://www.hobbypartz.com/ductedfan.html
dpowellmeii is offline Find More Posts by dpowellmeii
Reply With Quote
Old Jul 26, 2014, 08:02 PM
Registered User
United States, UT, Saratoga Springs
Joined Mar 2010
451 Posts
Got the whoosh sound! I am using a CS64mm fan, 2600kv motor and 4s 2200 batt. Fan & motor were dynamic balanced.

Sounds great but it is way down on thrust as you can see on the launch. I need to open up the thrust tube, it's at 50mm in this video. What's the recommended size for thrust tube using a CS 64mm fan unit? Do I need to be about 60mm or perhaps more at the tube exit? Thanks. -Justin

(Edit for this video: I would never intentionally land over another plane. The other flyer didn't call out his landing and I was already out of battery and on final when I noticed he was there.)
EF16 4s with Change Sun 64mm fan (2 min 14 sec)
the_walrus is offline Find More Posts by the_walrus
Reply With Quote
Old Jul 26, 2014, 08:06 PM
Registered User
D_FAST's Avatar
Denver CO
Joined Apr 2008
2,033 Posts
57mm is where i found the sweet spot to be.
D_FAST is online now Find More Posts by D_FAST
RCG Plus Member
Latest blog entry: Dassualt Alpha Jet
Reply With Quote
Old Jul 26, 2014, 08:21 PM
Registered User
Madison, MS
Joined Oct 2006
709 Posts
Quote:
Originally Posted by the_walrus View Post
Got the whoosh sound! I am using a CS64mm fan, 2600kv motor and 4s 2200 batt. Fan & motor were dynamic balanced.

Sounds great but it is way down on thrust as you can see on the launch. I need to open up the thrust tube, it's at 50mm in this video. What's the recommended size for thrust tube using a CS 64mm fan unit? Do I need to be about 60mm or perhaps more at the tube exit? Thanks. -Justin

(Edit for this video: I would never intentionally land over another plane. The other flyer didn't call out his landing and I was already out of battery and on final when I noticed he was there.)
https://www.youtube.com/watch?v=QWHEcwr5siM
Whats the i.d. of the 64mm fan shroud and the o.d. of the 64mm fan hub? I've got a spread sheet someone made that will spit out the numbers.

It sounds great.
dpowellmeii is offline Find More Posts by dpowellmeii
Reply With Quote
Old Jul 26, 2014, 08:32 PM
Registered User
Madison, MS
Joined Oct 2006
709 Posts
I'm just guessing at the measurements but here we go...

Fan Shroud Inner diameter* 63
Fan Hub daimeter* 30

Exhaust Diameter (single outlet)
100% FSA 55.39855594
95% FSA 53.99583317
90% FSA 52.55568475
85% FSA 51.07494493
80% FSA 49.54997477
75% FSA 47.97655678
70% FSA 46.34975728
dpowellmeii is offline Find More Posts by dpowellmeii
Reply With Quote
Old Jul 27, 2014, 07:06 AM
Registered User
D_FAST's Avatar
Denver CO
Joined Apr 2008
2,033 Posts
For this particular unit, a CS 64mm 12blade

Fan hub is actually 22.3mm
I.D. is actually 64.3mm

Exhaust Diameter (single outlet)
100% FSA 60.30
95% FSA 58.78
90% FSA 57.21 << Sweet spot
85% FSA 55.60
80% FSA 53.94
75% FSA 52.22
70% FSA 50.45

4s/2700kv/41amps/600watts/thrust 1.9lb

4s/3000kv/70amps/965watts/ thrust 2.62lb

Change Sun 64mm 12 Blade 7 stator on Dons Wicked 2700 (2 min 9 sec)


Change Sun 64mm 12 Blade EDF (1 min 41 sec)
D_FAST is online now Find More Posts by D_FAST
RCG Plus Member
Latest blog entry: Dassualt Alpha Jet
Reply With Quote
Old Jul 27, 2014, 08:31 AM
Registered User
United States, UT, Saratoga Springs
Joined Mar 2010
451 Posts
Awesome, thanks for the info. I'll open it up to 57mm and see how it goes. No wonder my launch was so weak since I'm only at 70% FSA.
the_walrus is offline Find More Posts by the_walrus
Reply With Quote
Old Jul 27, 2014, 08:48 AM
Registered User
Madison, MS
Joined Oct 2006
709 Posts
Quote:
Originally Posted by D_FAST View Post
For this particular unit, a CS 64mm 12blade

Fan hub is actually 22.3mm
I.D. is actually 64.3mm

Exhaust Diameter (single outlet)
100% FSA 60.30
95% FSA 58.78
90% FSA 57.21 << Sweet spot
85% FSA 55.60
80% FSA 53.94
75% FSA 52.22
70% FSA 50.45

4s/2700kv/41amps/600watts/thrust 1.9lb

4s/3000kv/70amps/965watts/ thrust 2.62lb
Thanks, I was just taking a shot in the dark there. I get the same numbers with those measurements as well. I did see some 64mm setups that were using 28mm motors but I guess they were cut down 70mm fans.
dpowellmeii is offline Find More Posts by dpowellmeii
Reply With Quote
Old Jul 27, 2014, 08:49 AM
Registered User
D_FAST's Avatar
Denver CO
Joined Apr 2008
2,033 Posts
Quote:
Originally Posted by the_walrus View Post
Awesome, thanks for the info. I'll open it up to 57mm and see how it goes. No wonder my launch was so weak since I'm only at 70% FSA.
not sure if you can shave enough to get a thrust tube in there.

Ive found by not pinching the tube near the endbell of the outrunner provides better efficiency with these high bladed units.

My (3) 64/12's have 2 piece exhaust tubes

The longer the exhaust tube you can get away with it as it doesnt pinch so much.

Basically pinching it at the endbell, will increase your total watts, but with no gain, except extra heat.
D_FAST is online now Find More Posts by D_FAST
RCG Plus Member
Latest blog entry: Dassualt Alpha Jet
Reply With Quote
Old Jul 27, 2014, 09:16 AM
Tommy Toy the Crazy Boy
United States, AR, Jonesboro
Joined Mar 2013
326 Posts
Quote:
Originally Posted by D_FAST View Post
For this particular unit, a CS 64mm 12blade

Fan hub is actually 22.3mm
I.D. is actually 64.3mm

Exhaust Diameter (single outlet)
100% FSA 60.30
95% FSA 58.78
90% FSA 57.21 << Sweet spot
85% FSA 55.60
80% FSA 53.94
75% FSA 52.22
70% FSA 50.45

4s/2700kv/41amps/600watts/thrust 1.9lb

4s/3000kv/70amps/965watts/ thrust 2.62lb

http://youtu.be/3ArCKHIXu6s

http://youtu.be/OAbPF-m_OCk
I'm new to EDFs, so please forgive my ignorance.

What does CS mean? Is the 64mm the outer diameter of the EDF housing?
What does FSA mean?

Thanks.

BTW: These are on sale again.
tmulligan is offline Find More Posts by tmulligan
Reply With Quote
Old Jul 27, 2014, 10:01 AM
Registered User
Madison, MS
Joined Oct 2006
709 Posts
Quote:
Originally Posted by tmulligan View Post
I'm new to EDFs, so please forgive my ignorance.

What does CS mean? Is the 64mm the outer diameter of the EDF housing?
What does FSA mean?

Thanks.

BTW: These are on sale again.
CS = Changesun, the brand name of the fan.

64mm technically should represent the o.d. of the fan rotor itself. This is not always the case though. Most are pretty close, within a mm or so.

FSA = Fan swept area. The area of the inside volume of the fan shroud minus the area that the fan hub takes up.
dpowellmeii is offline Find More Posts by dpowellmeii
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Help! Phase 3 Hobbypeople F16- build tips? Smokescreen38 Foamy EDFs 89 Jul 03, 2014 05:39 AM
Discussion Phase 3 - Hobbypeople F16 UPGRADES (cont.) Flying Beagle Foamy EDFs 13 Nov 10, 2010 02:54 AM
Discussion Phase 3 - Hobbypeople F16 UPGRADES ducatirdr Foamy EDFs 11482 Nov 09, 2010 10:05 PM
Wanted Phase 3 F16 body dmize Aircraft - Electric - Jets (FS/W) 0 Oct 01, 2010 10:36 PM
Sold Phase 3 f16 arf NorCal Hobbies Aircraft - Electric - Jets (FS/W) 1 Sep 02, 2010 07:30 PM