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Old Jul 24, 2012, 04:11 AM
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The SK3 3300 does not fit in the CS shroud. The stand-off is to short. You have to cut ~6mm from the back of the shroud for it to fit.
I run a Kv3300 (rewound Turnigy 2226) on 3 cells and it pulls 55A with the 10 blade.

If the SK3 can handle 85A, IT (the SK3!) maybe would work with 4 cells?
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Last edited by MagnusEl; Jul 24, 2012 at 09:32 AM. Reason: clarifying details...
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Old Jul 24, 2012, 04:31 AM
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Quote:
Originally Posted by MagnusEl View Post
The SK3 3300 does not fit in the CS shroud. The stand-off is to short. You have to cut ~6mm from the back of the shroud for it to fit.
I run a Kv3300 (rewound Turnigy 2226) on 3 cells and it pulls 55A with the 10 blade. If the SK3 can handle 85A it maybe would work with 4 cells?
I have to check again but I am 90% certain that I run the SK3 3516-3300kv in a stock CS shroud.

It can handle 80Amps+ because it has a stand-off and the bell is in the airstream.

The L2226 will not have a chance.
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Old Jul 24, 2012, 05:33 AM
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4 cells and 2800kv is already 57A area. By 3300kv you would be getting to very high Amps!
It seems to cost approx 10A per 200kv - not that it will be linear, and probably would be worse than linear. So I expect it would go over 80A. Maybe 85A to 90A area.

800W capable (approx).... you are pushing 1200W by a bit into 80A's
It will probably fry just like a L2855 on 6S. Though not impossible you could be lucky. It is just not anywhere near technically up to the task.
If it was 3100kv (or even 3000 really) it would be more suited.

Better off in a low blade count fan.
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Old Jul 24, 2012, 06:36 AM
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I have two motor/fan set ups to choose from for my new ExceedRC F-18. I have a bl15 and delta v (3200kv) and the CS 10 blade with the HK L2855...either way i planning on running 4s...anyone can you provide me with some insight on what to expect when i start running my tests with the watt meter later this week. I have an 80amp ESC at the moment and don't really expect the CS to work out. This is just a gut feeling i have from what i have been reading. I am definitely no expert though. This is only my second EDF and first that is a kit. Thanks guys. I appreciate any help or knowledge you are willing to share
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Old Jul 24, 2012, 06:56 AM
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If you are referring to the L2855-2800kv then you should expect around 60amps.

My guess is that you will see similar thrust number between the 2.
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Old Jul 24, 2012, 07:19 AM
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Its actually the 2100 kv rated at 900w
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Old Jul 24, 2012, 07:35 AM
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Its actually the 2100 kv rated at 900w
It will not do much on 4S. On 5S it will be good. Use it on 6S but with smaller 6S batteries - say 2650mah 25c or 35C.
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Old Jul 24, 2012, 07:47 AM
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okay...well i have been debating on whether i should go with 4s or bigger so that may help me make up my mind. i would like to use the CS but if the batteries cost too much i may stick with 4s. Thanks for the tips!
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Old Jul 24, 2012, 08:50 AM
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...The L2226 will not have a chance.
It's ok, I ran it off 4s for a little under 4lbs of thrust peak at high 70-ish amps, it did get hot but didn't take forever to cool down so no real heat soak throughout windings.

The mounting plate is too big for the stock CS fan shroud, I put mine in one of the older wemo knock off fans from HK....worked nice enough but wasn't putting out 100% of what mag field could put out on the cell count even with up'd timing.

The same motor with the 5usd T-50 fan HK sells would do 3lbs of thrust settled on 4s\60 amps and 4lbs of thrust settled on 5s\70 amps and could run with the extra half volt from a 65c pack without burning laminate...15usd...I still have some of those motor, one is in a wind rider F35

That was my favorite budget combo till the CS10 came around.
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Old Jul 24, 2012, 08:55 AM
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It's ok, I ran it off 4s for a little under 4lbs of thrust peak at high 70-ish amps, it did get hot but didn't take forever to cool down so no real heat soak throughout windings.
e, Yes - but has rewound it to 3300kv so it will pull much more than that.
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Old Jul 24, 2012, 08:58 AM
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...But then again why do that the L2855-2300kv on 5S does better....
I theorize that it has the best SIZED mag field for that series of motors where as the 2100 is prolly operating at 95% of what it can do in turning watts to RPM the 2300kv is around 80% of what it can do turning watts to RPMs with the CS 10 with a 2700 watt constant pack.

The 2300kv has enough head room on the mag field to take the extra half volt from a 65c pack also with a tap up in timing if the esc doesn't get hot...I haven't tested this yet but 4lbs with tapped up timing and high c Packs doesn't seem out of the question.

The nice thing about the 2100ikv motor is it's using almost 100% of it's capability at 3300mah 40c...that's squeezing every RPM to watt that can be had for that sized magnetic field. I bet if it could be put into airflow that it could handle a higher C pack because the volume of forced air could keep the winding laminates from melting but still not put out more RPMs....I like squeezing the motor safely cause I hate to think I am leaving some CFM of air on the bench per watt....

Sacrilege = driving a Dodge Viper and not taking it out of 4 gear

The 2300kv is the best of the L series budget motors....I just don't like odd cell packs....that's just me
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Old Jul 24, 2012, 09:52 AM
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Well, I do not intend to run my 2226 with 4 cells (for the moment at least), I just suggested that if the SK3 can take 85A, it, (the SK3!) maybe could be run on 4 cells, since it has the same Kv as my rewired 2226, that pulls 55A @ 3 cells...

The mountingplate is not too big for CS shroud,(though it is a very tight fit), but the motor tube in the shroud is to long, I just meassured it with caliper and it is 6mm to long....


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Originally Posted by PeterVRC View Post
Better off in a low blade count fan.
Probably right Peter.
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Old Jul 24, 2012, 10:03 AM
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Yes I had tried my SK3 in the CS10 housing and the motor housing is too long. But there are some other housings you can still run the CS10 rotor in that are shorter and fine. eg Freewing... which HK sell as no name. I would not cut down a CS10 housing as they are flimsy as they come already!
But as already mentioned... I would not even bother using the SK3 with a CS10 rotor.

The L2855-2800 on 4S gives 1.35Kg thrust for 56A. Approx the area as Anlucas mentioned.
If you used a 2300kv... or 2100kv, as you have that.... you can imagine the thrust. LOL
Maybe 0.7Kg for 2100kv on 4S. hehe
But it would last forever......
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Old Jul 24, 2012, 11:43 AM
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Quote:
Originally Posted by PeterVRC View Post
But there are some other housings you can still run the CS10 rotor in that are shorter and fine. eg Freewing... which HK sell as no name.
Peter,

Are you talking about this one?

http://www.hobbyking.com/hobbyking/s...inch_68mm.html

If so it doesn't work for a couple of reasons, but the biggest reason is the motor housing is too short so the motor would just hang instead of being supported by the lip.

I wish HK would start ripping off the aluminum housing designs and selling the housings only for ubber cheap. It's coming I'm sure just not soon enough.

Steve
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Old Jul 24, 2012, 05:56 PM
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I would think it was this one. I have too many types from them and not sure which is which - but this looks right:

http://www.hobbyking.com/hobbyking/s...inch_70mm.html

You could put your own 'neck' to support it. I never even thought about that.... but I would just use some wood. Probably a plywood (3mm or 4mm) disc, cut in half to allow it to be joined. Or maybe even a pair of those from 2.5mm, and cross them at 90deg to be a stronger end result. Glue them onto the motor extension and they can just wedge (slightly) into the housing hole.
Or maybe even more elaborate.... 19mm pine, machined (saw, file, drill) to form the same idea but being 19mm long for more support. Sort of ending up like KnifeLiddle's way of mounting a bigger outrunner.
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