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Old Jan 08, 2013, 10:26 PM
Extreme CNC Alloy EDF
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Ok had a look at the new rotors, they have changed the molding and improved here and there, whether its stronger remains to be seen but as I am already getting over 2kg thrust reliably with the CS10 so I am not too worried about the CS12 strength.

I need to send in a new drawing for spinners if I go with this rotor as well, as they have changed the spinner seat, its a little bigger diameter, deeper too which is good. Hub is 1mm bigger diameter, blades look almost identical to me, pitch and size bar the 0.5mm length reduction.

I will balance one up later this week and run it on my 4s and 6s setups to see what the story is. I need to order more spinners for the CS10 so might order 2 lots and do a CS12 spinner as well. The spinners are all diamond cut no polishing needed, they come off the CNC exactly as you guys who have them can see
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Old Jan 09, 2013, 10:13 AM
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Originally Posted by anlucas View Post
The 2x2300kv will pull 80amps between them.

The 2x2800kv will pull 120amps to give you 1lb or so more thrust.

It's up to you and whether your batteries can handle the load.
hello anlucas, thanks for the reply!

may i ask how much thryst does the 2300kv pair creates/?
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Old Jan 09, 2013, 10:18 AM
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Originally Posted by T-BONEZ View Post
hello anlucas, thanks for the reply!

may i ask how much thryst does the 2300kv pair creates/?
Difficult to say what they will give in the F-14 airframe but on the stand with an inlet lip, they can generate around 2.3-2.5lbs each so double that for a pair.
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Old Jan 09, 2013, 11:34 AM
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Originally Posted by anlucas View Post
Difficult to say what they will give in the F-14 airframe but on the stand with an inlet lip, they can generate around 2.3-2.5lbs each so double that for a pair.
Thanks again..

Something just struck my mind...

Will the 2300kv motor on full throttle (let's say 40amps)

Produce the same amount of thrust as compared to:

2800kv Motor on a throttle setting which will give 40amps draw?

I'm thinking if i can cruise around nicely with the 2800kv at 40amps draw and save the 40 - 60 amps range for emergency throttles
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Old Jan 09, 2013, 12:21 PM
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Originally Posted by T-BONEZ View Post
Thanks again..

Something just struck my mind...

Will the 2300kv motor on full throttle (let's say 40amps)

Produce the same amount of thrust as compared to:

2800kv Motor on a throttle setting which will give 40amps draw?

I'm thinking if i can cruise around nicely with the 2800kv at 40amps draw and save the 40 - 60 amps range for emergency throttles
I haven't tried a specific test but theoretically, Yes.

If the motors are spinning at the same RPM and we are talking about almost identical motors bar the winding turns, the energy required should be similar.
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Old Jan 09, 2013, 12:28 PM
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similar, if a bit lower (ESCs less efficient at partial throttle than WOT, higher losses in all wires and lipo (Ohms resistance rises with Amps squared), but similar.

For me, the question would rather be very mundane: Do I have ESCs which cope with 65A, if not how much bigger / heavier are they (for 40A I use cheap 33g Blue Series ESCs from HK, good 65A ESCs coping with high rpm cost a bit more and also weigh a bit more), AND will my lipos be happy at higher amps, Probably if short WOT burst are all there is, good airflow around the lipos and it will be fine.
So, what lipos you intend to use?
...my 2c...
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Old Jan 09, 2013, 01:36 PM
chuck
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and my 2c....... my tests were well under 40 amps on 4's for the2300 w/ good batteries , for whatever reason. not enough power on 4's for me.

and the lower resistance of the higher kv motors (less heat) may offset the losses at part throttle in the esc, fwiw.

chuck.
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Old Jan 09, 2013, 02:11 PM
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Originally Posted by chas650r View Post
and my 2c....... my tests were well under 40 amps on 4's for the2300 w/ good batteries , for whatever reason. not enough power on 4's for me.
I 've measured everything from 33amps to 46amps on these L2855-2300kv motors with various ESC, timing and battery combinations.

Some ESCs like the HK SS 60-70amp showed lower results than the Turnigy Plush (Hobbywing).
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Old Jan 09, 2013, 04:35 PM
chuck
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Originally Posted by anlucas View Post
I 've measured everything from 33amps to 46amps on these L2855-2300kv motors with various ESC, timing and battery combinations.

Some ESCs like the HK SS 60-70amp showed lower results than the Turnigy Plush (Hobbywing).
any idea how the thrust compared?getting a 46 amp draw could be good if the output power is relative. my tests were all in the lower 30's w/ 2 different h/wing esc's and at different timing settings. i may have had a lower than norm kv?

chuck.
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Old Jan 09, 2013, 04:56 PM
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L2855 2300kv on 65c pack

Really like the 2300kv motor

Turnigy L2855-2300kv - 5S - CS 10 Blade Test (2 min 11 sec)
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Old Jan 09, 2013, 05:27 PM
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What was the measuring unit on the scale?
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Old Jan 09, 2013, 05:36 PM
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That will be Kg. Just under 2Kg peak (1.9Kg area)

That fan ran very well!! A great feed from the battery - which you would hope 65C would be! hehe. And a very well balanced fan too!

I tend to use 20, 30, 40C (20C in the Vampire as the airflow restriction drops possible power anyway), but then you only see about 900W area.... not 1100W or more like the 65C there did.
Though you can see by the heats, it isn't going to be a happy camper at that power level long term! And at those power levels you really would need to pay good attention to running it down so the motor cools well before stopping.
They are an amazing value motor series! 2100, 2300, 2800. Best used for max 900W or so areas though - and not over 60A area on any of them (pref 55A or under). (push a 1000W, within the current limit range mentionend, and it can be ok if treated nicely)
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Old Jan 09, 2013, 05:47 PM
chuck
santa barbara, CA
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Quote:
Originally Posted by erh7771 View Post
L2855 2300kv on 65c pack

Really like the 2300kv motor

http://www.youtube.com/watch?v=32i_fNzmPZk
ya , i think on 5's it would be good , the above was 4's comments,
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Old Jan 10, 2013, 12:18 AM
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Quote:
Originally Posted by chas650r View Post
any idea how the thrust compared?getting a 46 amp draw could be good if the output power is relative. my tests were all in the lower 30's w/ 2 different h/wing esc's and at different timing settings. i may have had a lower than norm kv?

chuck.
1.0 to 1.3Kg thrust. 42-46amps(different batteries) came with high timing but very little thrust improvement.

The most efficient is around 40 amps (low timing) for around 1.2Kg peak which settes to 37amps 1-1.1Kg from memory.
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Old Jan 10, 2013, 12:54 AM
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Quote:
Originally Posted by erh7771 View Post
L2855 2300kv on 65c pack

Really like the 2300kv motor
Yeah, I run that test a few months ago just to show what is possible with these low cost motors...

That motor is RIP as of a couple of weeks ago after 4 mins of WOT in my Panther....

It got very hot and slipped on the mount. The bell started rubbing on the motor housing and it ceased....

One more case for a better housing for high power setups.
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