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Old Jul 13, 2012, 12:48 AM
Extreme CNC Alloy EDF
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Australia
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4s will be very hot as its a torquey motor, I wouldnt be using it on 5s.
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Old Jul 13, 2012, 06:32 AM
EDF rules... :)
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Originally Posted by onefastxp View Post
has any body run this set up before i have a 28-58-1 arc motor with the c.s fan on 5s? they say it can handle little over 80 amps.
Whats the KV and how much does it weigh?

Eric B.
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Old Jul 13, 2012, 06:58 AM
Extreme CNC Alloy EDF
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Its a 3200Kv motor and 155 grams.
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Old Jul 13, 2012, 08:09 AM
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Originally Posted by onefastxp View Post
has any body run this set up before i have a 28-58-1 arc motor with the c.s fan on 5s? they say it can handle little over 80 amps.
That arc motor would most likely be over 100 amps on 4s prolly around 4.5lbs of thrust.

PM'd for a 4 and 5s motor that would be great with CS fan
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Old Jul 13, 2012, 10:49 AM
ROLL, PITCH, YAW
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Originally Posted by jk671 View Post
i like the whole package.... I might be ordering 3... gonna run it with the HET 2w-30 :O so much money!
Yeah, really makes it hard to keep money in your pocket nowadays!! Gonna have to get one of these myself.
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Old Jul 13, 2012, 07:14 PM
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I fried a second L2855-2100kv in a CS10 on 6S today.
So I have decided to assign L2855's as "Not up to the task of 6S in a CS10".
They can work.... and for how long is the luck of whatever you get. But they are notably over-stressed for sure.
Mine were running 1200W or so, and that is obviously too much for them.
For the second one frying I was only flying around at 60% throttle approx.... maybe 2mins after a WOT take-off. So that even shows quite a bit less than 1200W can even be the true area you would want to be under to be safer. eg 1000W is probably even on the limit really.

So for CS10's I will limit L2855's to 5S. Whether using a 2100kv or 2300kv for that. There is no L2855 of a KV rating that is sutable for 6S AND to keep it 1000W, or lower, area. That would need a 1900kv sort of KV rating.

My L2855-2300kv 5S main setup is still going fine, and that is 850W approx. But I actually think even that is about the optimal area keep them aimed for. Maybe a setup (any cell count) allowing 1000W at WOT, but flying mainly at 900W or less.
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Old Jul 13, 2012, 07:20 PM
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My XK2850-2060kv is running very well on 6S, so that is now my number one motor of choice for the CS10 on 6S. Because it is "of HET level" ability, but only $32 (if you can get any), and running at 56A for 1189W and 1.7Kg thrust ongoing, so that is a very good result for the cost.
And it is made to keep doing that power level just fine.

I have to ferret out another good and cheap Outrunner for 6S.....
Cyclone's are that bit too expensive ($44 area). But they are a technically good option. Something under 2300kv... preferably 2200kv, or 2100kv (2150kv being optimal?). I am not sure what they have - if any truly useful/optimal KV as those mentioned.
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Old Jul 13, 2012, 07:32 PM
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For a source of real Leopard motors (seeing HobbyKing seems to be running out of all version they had clones of) here is a link below.
But note, then you are paying double the HK price. Car or boat style doesn't matter.

http://www.helipal.com/leopard-power...rnmju3toldhhi6
[This is just one link... it would be of use for 5S in a CS10. But even that is a bit over specs (2300KV is better)]
http://www.helipal.com/leopard-power...duct-jets.html
But Leopard make far more motors - a far grreater KV range, in every size they make (eg 28mmx50mm, or 60mm) - than listed at this site. The problem is finding WHO sells those all.

Still under a HET price, but there is a small difference.....
HETs have better cooling, so are made more specifically for aircraft (EDF) use.

So for eg. you will have $64 area (Leopard) versus $75 area (HET).... which is over 15% cost difference.
Leopards all with useful 4mm shafts, and high quality materials etc (in both I guess anyway - and I suspect HET and Leopard are either the same manufacturer source anyway, or at least very much the same materials and designs)
You could drill out cooling holes in the end caps if you really wanted to, but they are designed for enclosed running in cars and boats, at their ratings, anyway, so it is really not an issue to leave it as it comes.
And this is part of the reason why you can run HET's etc quite a way over-spec and they will be fine, because with better cooling they can better cope doing that. But run anything over-specs and you are going to pay for it in one way or another anyway. Best is to run things UNDER specs.... if you want it to do that job reliably and last.

And if HobbyKing could ever get their XK series again (Leopards I am sure) then that is the best result possible, as it is then all but half price!!
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Old Jul 13, 2012, 08:09 PM
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United States, TX, Grand Prairie
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Quote:
Originally Posted by PeterVRC View Post
I fried a second L2855-2100kv in a CS10 on 6S today.
So I have decided to assign L2855's as "Not up to the task of 6S in a CS10".
They can work.... and for how long is the luck of whatever you get. But they are notably over-stressed for sure.
Mine were running 1200W or so, and that is obviously too much for them.
For the second one frying I was only flying around at 60% throttle approx.... maybe 2mins after a WOT take-off. So that even shows quite a bit less than 1200W can even be the true area you would want to be under to be safer. eg 1000W is probably even on the limit really.

So for CS10's I will limit L2855's to 5S. Whether using a 2100kv or 2300kv for that. There is no L2855 of a KV rating that is sutable for 6S AND to keep it 1000W, or lower, area. That would need a 1900kv sort of KV rating.

My L2855-2300kv 5S main setup is still going fine, and that is 850W approx. But I actually think even that is about the optimal area keep them aimed for. Maybe a setup (any cell count) allowing 1000W at WOT, but flying mainly at 900W or less.
What was your C rating on your pack?

Regards
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Old Jul 13, 2012, 11:56 PM
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Dual CS10's with L2855-2100's running from one 6S 5800mAH 30C Zippy.
58A each at WOT when in-plane static.
5800 x 30 = 174 Amps... yep, sure thing... divide by TWO more likely.... 87A..... a bit overstressed at 116A

I get 'better' (?) power if I run two batteries on the bench - when I use the Zippy 5800 for 90mm fan tests. eg they need 100A approx... whilst this plane needs 116A WOT.
So seeing the Zippy can't drive a motor that wants something a bit over 100A, it won't be feeding the twin L2855's what they could draw too.
I have bench tested L2855's out to mid 60A's, so they can 'ask' for that (on CS10 loads) if the battery can give it.

So anyway, the battery in this case was somewhat 'good' for the task, but still a shortfall over what a better battery (higher C) would have driven it out to.
You don't want to use an inadequate battery (lower C) as a "power limiter".... it just ruins those batteries quicker.
You want the correct battery, for the job it needs to do.
KV is the correct item to use for power control.
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Old Jul 14, 2012, 12:28 AM
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Greece, Attica, Athens
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Quote:
Originally Posted by PeterVRC View Post
I fried a second L2855-2100kv in a CS10 on 6S today.
So I have decided to assign L2855's as "Not up to the task of 6S in a CS10".
They can work.... and for how long is the luck of whatever you get. But they are notably over-stressed for sure.
Peter, thanks for posting this.

which ESC and what timing where you running?

I am asking because after my first tests with an HK SS ESC I felt that 6S wasn't to be for the 2100kv. They were getting very hot. When I switched to a Turnigy Plush on Low timing - no such problems.

I just have to keep an eye on things after your experience.
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Old Jul 14, 2012, 02:48 AM
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Antarctica
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u can try using HET 2W30 (CS10 fan) with 6S (3300mah).my ARC tech Red Viper..V
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Old Jul 14, 2012, 11:07 AM
"LiPo-Blaster"
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Duluth, GA
Joined Apr 2009
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Nice video viper! Was this an Exceed F/A-18 & what size 6S are you running?
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Old Jul 14, 2012, 12:04 PM
Official Boat Bum
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United States, NV, Reno
Joined Mar 2000
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Hey Tam, with your upgraded housing and the CS70 rotor what sort of thrust figures have you seen? I'm looking at my big airliner build again. And I need something in the 5 pound thrust category minimum - 5.5 would be better... The sound of the CS70 rotor is a bonus but your housing with heat sink and the upgraded adapter would be critical so it could run hassle free and for 8 mins at a time and I'll have 4 of them turning. What do you think?
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Old Jul 14, 2012, 10:03 PM
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Originally Posted by RugFlyer View Post
Nice video viper! Was this an Exceed F/A-18 & what size 6S are you running?
it's a Arc Tech Red Viper... i think it's the same as Exceed...in Asian... Battery size and rating is 6S 3300mah.
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