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Old Aug 13, 2012, 07:03 PM
Extreme CNC Alloy EDF
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New housing batch has been finished and is being packed right now, will start shipping out in the next day or so. Plenty of 70mm, 90mm, and I adjusted the design on the 64mm housing, now 65mm ID with straight inlet and some small changes to make it easier to install, the outside diameter is close to most plastic 64mm fans we just gain a mm in rotor size.
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Old Aug 16, 2012, 11:20 AM
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Joined Jun 2007
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hello all,

jut askingn is 4s + l2855-2300kv+ cs 70mm 10 blade a good combo?

I'm not looking for any extreme high speed performance , but rather power my f-14 good and easy with 2kg thrust,
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Old Aug 16, 2012, 11:39 AM
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Quote:
Originally Posted by T-BONEZ View Post
hello all,

jut askingn is 4s + l2855-2300kv+ cs 70mm 10 blade a good combo?

I'm not looking for any extreme high speed performance , but rather power my f-14 good and easy with 2kg thrust,
Yeap...

Which version of the F14 60mm or 70mm?

Regards
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Old Aug 16, 2012, 11:42 AM
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mine is the old epf/airpower f-14, 70mm non-swing wing...

i;m looking to try and get 1.2kg++ thrust on the bench each before i mount the on... my plan is going to weigh about 1.8-2kg

also, are the hobbyking 70mm 10blade edf changesun orginals? or imitations?
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Old Aug 16, 2012, 11:45 AM
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Originally Posted by T-BONEZ View Post
mine is the old epf/airpower f-14, 70mm non-swing wing...

i;m looking to try and get 1.2kg++ thrust on the bench each before i mount the on... my plan is going to weigh about 1.8-2kg

also, are the hobbyking 70mm 10blade edf changesun orginals? or imitations?
originals...will sound really nice, have the SM f14...sound like small turbine
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Old Aug 16, 2012, 11:48 AM
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just to ask, will the changesun run fine on my current freewing 70mm 3000kv?

or am i looking at a potential over heat issue?
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Old Aug 16, 2012, 12:23 PM
Graham Dyer
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FWIW, I found this paper while doing some research on duct length: http://southamptonmac.org.uk/doc/EDFpart1.pdf.
It may be of some interest to those using these EDF's. It is quite technical (read brain-bending), fairly old (before brushless and LiPo!) but very relevant and has some interesting calculations, advice and conclusions.
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Old Aug 16, 2012, 12:56 PM
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Originally Posted by T-BONEZ View Post
just to ask, will the changesun run fine on my current freewing 70mm 3000kv?

or am i looking at a potential over heat issue?
post pic
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Old Aug 16, 2012, 01:09 PM
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http://www.tporder.com/list.asp?ProdId=0107

here!
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Old Aug 16, 2012, 01:10 PM
EDF rules... :)
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Quote:
Originally Posted by T-BONEZ View Post
hello all,

jut askingn is 4s + l2855-2300kv+ cs 70mm 10 blade a good combo?

I'm not looking for any extreme high speed performance , but rather power my f-14 good and easy with 2kg thrust,
The L2855-2300 works great on 4s, the thrust is ~1.2Kg, the amps run ~40amps and the battery is able to hold voltage quite well so rpms are fairly stable.

Quote:
just to ask, will the changesun run fine on my current freewing 70mm 3000kv?

or am i looking at a potential over heat issue?
The fan is a bit high for most 3000kv motors and there can be overheat problems from the high amp draw (~ +-90amps IIRC).
After looking at your picture I see the motor weight is 85 grams and it will reside in the motor tube so there will be less airflow over it to remove heat. If it had the offset It might last a little while but I think you would still damage that motor in this fan.

Eric B.
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Last edited by AirX; Aug 16, 2012 at 01:14 PM. Reason: added comment
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Old Aug 16, 2012, 01:29 PM
3DHOG
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Quote:
Originally Posted by pardus View Post
FWIW, I found this paper while doing some research on duct length: http://southamptonmac.org.uk/doc/EDFpart1.pdf.
It may be of some interest to those using these EDF's. It is quite technical (read brain-bending), fairly old (before brushless and LiPo!) but very relevant and has some interesting calculations, advice and conclusions.
Pardus
thats good stuff do you have a link to part 2? if there is a part 2?
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Old Aug 16, 2012, 01:31 PM
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Originally Posted by AirX View Post
The L2855-2300 works great on 4s, the thrust is ~1.2Kg, the amps run ~40amps and the battery is able to hold voltage quite well so rpms are fairly stable.



The fan is a bit high for most 3000kv motors and there can be overheat problems from the high amp draw (~ +-90amps IIRC).
After looking at your picture I see the motor weight is 85 grams and it will reside in the motor tube so there will be less airflow over it to remove heat. If it had the offset It might last a little while but I think you would still damage that motor in this fan.

Eric B.
thanks bro, i'll just stick to the free wing 6 bladers till it needs replacing then... cheers!
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Old Aug 16, 2012, 01:40 PM
EDF rules... :)
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Originally Posted by jcdfrd View Post
Pardus
thats good stuff do you have a link to part 2? if there is a part 2?
KRS Edf 3
http://www.rcgroups.com/forums/showa...mentid=1192118

KRS Edf 1
http://www.rcgroups.com/forums/showa...mentid=1192117

KRS Edf pt2 construction
http://www.rcgroups.com/forums/showa...hmentid=885564

Eric B.
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Last edited by AirX; Aug 16, 2012 at 01:56 PM. Reason: Removed 1-1
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Old Aug 16, 2012, 01:55 PM
3DHOG
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hey thanks Eric
it looks like KRS edf 1 and KRS edf 1-1 are the same document
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Old Aug 16, 2012, 01:59 PM
EDF rules... :)
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Originally Posted by jcdfrd View Post
hey thanks Eric
it looks like KRS edf 1 and KRS edf 1-1 are the same document
Yup your right, i went in and removed it...

Your welcome.
I use a lot of the calculations in my spreadsheets. Klaus is/was the man and I am very greatful to him for taking the time to give us some of his knowlege here on the forum.

Eric B.
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