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Old Nov 01, 2012, 11:36 AM
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Flazo's Avatar
USA, NY, Queens
Joined Dec 2006
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you are right

Quote:
Originally Posted by davecrash View Post
That's 4250kv, I don't think so.
what about the ARC-28-58-1?

fred

Recomended Output: 1+ kW
KV: 3180
Weight: 153g
Shaft: 3.2 mm
Poles: 4

This is Dave's answer to the ultimate EDF motor. Built for 70mm EDF fans such as the WeMo 480 and the HET 6904. 5S is safe, anything higher is considered "experimental." Even at 5S, extreme care should be taken; balancing the rotor is vital to your health and safety (as well as the health and safety of the motor and your plane). Please keep all fingers and body parts clear of the fan when this motor is running. If a blade breaks, bad things can happen - BE WARNED! These motors are only recommended for experienced RC enthusiasts who are safety conscious.
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Old Nov 01, 2012, 11:55 AM
Fly now crash later
davecrash's Avatar
Canada, ON, Newmarket
Joined Nov 2006
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Quote:
Originally Posted by flazo View Post
what about the ARC-28-58-1?

fred

Recomended Output: 1+ kW
KV: 3180
Weight: 153g
Shaft: 3.2 mm
Poles: 4
Even that is some serious amp draw on the CS at 6S. A friend of mine just messaged me that he has the BL32 motor BNIB. Looks like I'm going to use that one in my Viper build.
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Old Nov 01, 2012, 12:28 PM
Mile High EDF
United States, CO, Denver
Joined Jul 2011
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Quote:
Originally Posted by davecrash View Post
Even that is some serious amp draw on the CS at 6S. A friend of mine just messaged me that he has the BL32 motor BNIB. Looks like I'm going to use that one in my Viper build.
I used that motor with Tams 5mm adaptor and spinner , that eflite motor is a good motor , on 6s I got around 70amps on the bench.

I'm putting that HK 70mm 10 blade alloy unit on 6s in my HK viperjet that's being delivered today.
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Old Nov 01, 2012, 12:52 PM
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Are there yet available reverse-rotation CS 70mm fans?
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Old Nov 01, 2012, 04:43 PM
Extreme CNC Alloy EDF
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Australia
Joined Mar 2006
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Quote:
Originally Posted by flazo View Post
what about the ARC-28-58-1?
This would be a 4 cell motor, maybe 5 if you didnt care about amp draw

The HET 1W40 is imho a better choice though, in back to back 6s tests with the Wemo fan the 1W40 is pushing 2.8kg thrust at 2060w, the 2858 does 2.5kg at 1880w.

In the CS fan the 1W40 would be a great 4s motor, maybe even 5s for the adventurous
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Old Nov 01, 2012, 05:16 PM
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The BL32 is 'almost' a nice 6S motor for the CS10....
Great specs.... 5mm shaft.... good quality and price for that.
But at 2150kv it won't quite get used to its maximum capability. If it was 2300kv it would.
It will be "under utilised" (eg more strength and build capability, that it won't reach in a CS10), which I guess will give you a longer life-span at least.

The HET 2W30 at 2200kv, is running a pretty good out put level, but it also would do that bit better if it was 2300kv. But at 2200kv it is marginally more output that a BL32 - because of its bit higher KV and that it is much the same build and capability motor, so it will drive the CS10 effectively at 2200kv.

Both those motors could drive a CS10 at 2300kv effectively. (due to their build/strength)

Ideally there would be some good level of build 2300kv motor, and the 2200kv's can be left for 'high power', and 2300kv for 'very high power', choices.

At the other end of the scale is the L2855-2100kv.... it can NOT drive a CS10 'effectively', because it is not a strong enough build to cope wit that task properly. It is well over-stressed by then.
And if you want a 2300kv to try..... hehe.... use a L2855-2300kv on 6S. For the 2 seconds that will last....

I am pretty sure that Leopard does have a 2300kv motor, of that HET and BL32 build level.
2860 size.... so it is really even a bit more capable than those (or at least equal).
The problem with a lot of the Leopards that are useful for CS10/CS12, is that they MAKE them, but no one SELLS them! They only sell Boat/Car suited KV levels, and don't stock the rest. It is like trying to find hens teeth!!

Here:
Leopard have a 2860-2260kv... but try finding where to buy one!! At 2260kv it is another bit of a step above the HET 2200kv.
http://www.leopardhobby.com/product/...ionID=01020204
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Old Nov 01, 2012, 05:21 PM
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Quote:
Originally Posted by PeterVRC View Post
The BL32 is 'almost' a nice 6S motor for the CS10....
Great specs.... 5mm shaft.... good quality and price for that.
But at 2150kv it won't quite get used to its maximum capability. If it was 2300kv it would.
It will be "under utilised" (eg more strength and build capability, that it won't reach in a CS10), which I guess will give you a longer life-span at least.
I have every intention of going 7S at some point with this setup.
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Old Nov 01, 2012, 05:27 PM
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Well if you plan on that, then lower KV is more useful for when you do move up.
And the 5mm shaft is a nice bonus.
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Old Nov 01, 2012, 06:00 PM
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This was almost a good source....
http://www.offshoreelectrics.com/pro...?prod=leo-2860

They don't sell the 2260kv, sheesh
$59 is a good price.


Or....

2040kv (6S mild) and 2260kv (6s wilder).... but in the version that has the motor lead 'block' on the end side - at least in his pics. (there are 'wire out the end' versions)
http://shop.rcboatbitz.com.au/index....ex&cPath=47_24
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Old Nov 01, 2012, 06:23 PM
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Quote:
Originally Posted by PeterVRC View Post
Well if you plan on that, then lower KV is more useful for when you do move up.
And the 5mm shaft is a nice bonus.
The HET 2W-30 was my first choice, but a friend just happened to have the BL32.
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Old Nov 01, 2012, 08:14 PM
chuck
santa barbara, CA
Joined May 2009
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Quote:
Originally Posted by davecrash View Post
The more I read the more I don't see the L2855 2100kv lasting any kind of time on 6S. Bench test today on 5S 2650mah 30C turnigy lipo gives me about 1:1 thrust in the Phase3 F-16. This will do for the maiden flight but I'm leaning towards the HET motors. most likely the 2W-30 and maybe the 3W-25. anybody want to trade for a BNIB 2W-20.
ya , a < 100 gram motor at 1600 watts = smoke. most likely wont even make a very good heater
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Old Nov 02, 2012, 12:40 AM
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Quote:
Originally Posted by chas650r View Post
ya , a < 100 gram motor at 1600 watts = smoke. most likely wont even make a very good heater
Not if it's an outrunner, plenty people running the 2100kv on 6s...don't use 65c packs...extra .25 - .50 volt hurts stuff...a lot of stuff.
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Old Nov 02, 2012, 12:51 AM
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But my two (in a row) 2100kv's blew up on 30C even....
And at 55A-56A area you need 30C to get to that Amp level. (need that level of IR for it all to balance out to that volt/current level). It would have been about 21v x 55A = 1150W area.

20C might do something like 52A (20.4v x 52A = 1060W, safe)..... 40C towards 60A (21.3v x 55A = 1278W, ouch..... 65C, hmmmm, 66A+ ?? (21.6v x 66A = 1420W, instant smoke!)
Just guesstimated V/A numbers, in the ballpark.

So it would seem to me that 30C is the max to be safe with... if even that.
I just wouldn't even use them on 6S..... (again)
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Old Nov 02, 2012, 12:56 AM
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I think Peter's electrical numbers are on the ballpark.

Thrust figures may be different due to the different test stands. I don't think it's likely that we will ever get to get comparable results between all the different test stands.
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Old Nov 02, 2012, 01:03 AM
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You would HOPE that if everyone used vertical stands they would have to be the same??

Digital 'quite good accuracy' - even from any kitchen variety digital scale unit
No friction losses
Nothing left for people to mess up accuracy with! LOL
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