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Old May 18, 2012, 11:11 PM
Kamikaze Ace
Glacier Girl's Avatar
USA, FL, Lakeland
Joined Jan 2010
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Mark, yeah Concept X, I saw your bird in the old thread on it. Inspired me to buy one.
I even added the fences like yours.

And I plan on pushing the limits on it, 6S/1700 watts of stupidness out of one of those 2855's.

My club has a speed run set up for this years meet. She's my entry. Go or blow.
I massaged the intakes coated em in poly to glass like, and bored out the rear fuse to fit the CS with the lip on it with a 59mm exhaust.
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Old May 18, 2012, 11:29 PM
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Greece, Attica, Athens
Joined May 2011
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Quote:
Originally Posted by THESANDMAN View Post
i only have 4s batteries at the moment 4s 2500 30c gen ace batteries to be exact
what motor do you guys/girls recomend ,2855/2800kv or the 2855/2300 or the 2855/2100 or any other motor that will give me the same performance or better.
better would be nice.
On 4S: I would go with the L2855-2800kv out of the above 3.
The HET 2W-25 is an option if cost is not important to you.

For significantly better performance you will need to go to either 5S batteries or larger 4S 3300-4000mah batteries.

The L2855-2300kv is good on 5S.

On 4S with larger batteries, the Cyclone Power 3300kv.
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Last edited by anlucas; May 18, 2012 at 11:36 PM.
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Old May 19, 2012, 01:13 AM
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Madison, MS
Joined Oct 2006
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Quote:
Originally Posted by THESANDMAN View Post
i just purchased the a new nitroplanes f18 with the retracts the AUW is 39oz i stated new since i have another one which is a ARF its my beater and iit runs stock . ive never clocked the speed ,but i quess it to be around 75~80mph .i get around 5minute fight time using one of those minutes to land .
so my question to you Gurus is
i only have 4s batteries at the moment 4s 2500 30c gen ace batteries to be exact
what motor do you guys/girls recomend ,2855/2800kv or the 2855/2300 or the 2855/2100 or any other motor that will give me the same performance or better.
better would be nice.
Quote:
Originally Posted by Glacier Girl View Post
DO a search here in the DF forum for the CS fan spec thread. Has lists of a lot of motors and combos and how they performed.

The 2100 on 4S pulls around 35 amps, 500 watts, 2 3/4+ thrust.
the 2300 was around 40 amps, 600 watts, and little closer to 3 pounds thrust, if I remember correctly.

Can't remember what the 2800 pulled, but with your packs, unless you parallel a pair the amp draw on the 2800 would be too much.
Here is the spreadsheet that Anlucas posted with test data from several motors including the 3 listed above.

Bear in mind, these numbers are on a test stand with the inlet lip on and no exhaust ducting. The static thrust numbers for the L2855-2100 dropped by an average of 55% with the intake lip off. I got Anlucas to run the numbers for me after I had done some testing with this motor and fan in my Phase 3 F-16. Once installed the static thrust numbers come back up by an average of about 8oz. I don't there is anyway that someone would see these test numbers in an airframe unless its in a pylon wing mount using the intake lip. I'll have to agree with Anlucas, go with the L2855-2800 out of the 3 you listed and you should get pretty good results. Just make sure you have nice smooth exhaust ducting and the right diameter.

http://www.rcgroups.com/forums/showp...postcount=1844

http://www.rcgroups.com/forums/showp...postcount=3694
http://www.rcgroups.com/forums/showp...postcount=3754
http://www.rcgroups.com/forums/showp...postcount=3759
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Old May 19, 2012, 04:56 AM
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Australia, VIC, Melbourne
Joined Nov 2006
11,239 Posts
L2855-2800 4S 54A 1.35Kg 770W
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Old May 19, 2012, 05:26 AM
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Antarctica
Joined Apr 2012
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Quote:
Originally Posted by anlucas View Post
On 4S: I would go with the L2855-2800kv out of the above 3.
The HET 2W-25 is an option if cost is not important to you.

For significantly better performance you will need to go to either 5S batteries or larger 4S 3300-4000mah batteries.

The L2855-2300kv is good on 5S.

On 4S with larger batteries, the Cyclone Power 3300kv.
Bench-tested. Real time measurements taken: For Sharing purposes...SAVED me LOTS of money with the CS 10 blade unit priced at $16 bucks!! compared to those expensive setup... and the WOOOOSSSHHHH sound is just FANTASTIC!!!!

For my HET 2w25 with cs 10 blade at 4S : ###### 56A / 810W #######

For my HET 2w18 with cs 10 blade at 4S : ##### 85A/1185W ######


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Old May 19, 2012, 05:38 AM
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Australia, VIC, Melbourne
Joined Nov 2006
11,239 Posts
Viper, you didn't list thrust results so the rest of the info doesn't help a lot.
The L2855-2800 gives similar numbers to that HET 2W25, but I expect the HET output/thrust is better. It would want to be for $57 more!

L2855 + fan = $29
HET + fan = $86
I am sure the HET is "better"..... probably better motor life, balance, output thrust, and at a bit lower Amps too.
But it cost a lot in increased dollar % to have that. (300% the cost of an L2855!)

So far I just keep resisting the HET...... LOL (even though I want to SEE one and test it, to experience it myself, hehe).
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Old May 19, 2012, 05:45 AM
How close are those trees?
Goody63's Avatar
Perth, Western Australia
Joined Apr 2008
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Quote:
Originally Posted by PeterVRC View Post
Viper, you didn't list thrust results so the rest of the info doesn't help a lot.
The L2855-2800 gives similar numbers to that HET 2W25, but I expect the HET output/thrust is better. It would want to be for $57 more!

L2855 + fan = $29
HET + fan = $86
I am sure the HET is "better"..... probably better motor life, balance, output thrust, and at a bit lower Amps too.
But it cost a lot in increased dollar % to have that. (300% the cost of an L2855!)

So far I just keep resisting the HET...... LOL (even though I want to SEE one and test it, to experience it myself, hehe).
Pete adding to what you mentioned about 'balance', the HETs are just so smooth (dynamically balanced) straight out of the box.

My dynamic balancer struggles to register a HET before mounting the rotor.
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Old May 19, 2012, 05:48 AM
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Antarctica
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Quote:
Originally Posted by PeterVRC View Post
Viper, you didn't list thrust results so the rest of the info doesn't help a lot.
The L2855-2800 gives similar numbers to that HET 2W25, but I expect the HET output/thrust is better. It would want to be for $57 more!

L2855 + fan = $29
HET + fan = $86
I am sure the HET is "better"..... probably better motor life, balance, output thrust, and at a bit lower Amps too.
But it cost a lot in increased dollar % to have that. (300% the cost of an L2855!)

So far I just keep resisting the HET...... LOL (even though I want to SEE one and test it, to experience it myself, hehe).
oopppss.. missed out the thrust.

2w18 - 1.5 kg without intake lip and 1.7Kg with intake lip...in my F22...fly like a racer...
2w25 - 1.46- 1.5kg with intake lip...using a weak lipo...

Looks like 2W25 is more efficient.
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Old May 19, 2012, 05:53 AM
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THESANDMAN's Avatar
United States, NY, New York
Joined Oct 2010
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Quote:
Originally Posted by Glacier Girl View Post
DO a search here in the DF forum for the CS fan spec thread. Has lists of a lot of motors and combos and how they performed.

The 2100 on 4S pulls around 35 amps, 500 watts, 2 3/4+ thrust.
the 2300 was around 40 amps, 600 watts, and little closer to 3 pounds thrust, if I remember correctly.

Can't remember what the 2800 pulled, but with your packs, unless you parallel a pair the amp draw on the 2800 would be too much.
thanks for the input, i have read through every page , but it gets a little confusing for me since this is all new to me . (not the flying ) the understanding of how power system works.
i usually have a more experienced pilot at my club recomend me a good power system set up but all of us are into prop planes , and i also want to learn my self i cant continue to rely on them for help
thanks again
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Old May 19, 2012, 10:20 AM
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United States, TX, Grand Prairie
Joined Nov 2005
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CP 480 2500kv with 65c 6s 3300 Nano's

109 amps, 23.6 volts, 6lbs 2oz thrust peak....volts held stead !

If you're going to run that motor with 6s I wouldn't do it with > 40c Nanos...tried the same pack on another plane and amps went up 20pts on it also...I didn't think the amps would rise that much on a volt

The CP motor I burnt was on a 65c nano, surprised it held up that long
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Old May 19, 2012, 10:21 AM
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United States, TX, Grand Prairie
Joined Nov 2005
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Quote:
Originally Posted by viperviper View Post
...

Blades look like they're slightly above shroud rim, smoother air with the rotor as deep in shroud as possible... more thrust possibly
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Old May 19, 2012, 11:38 AM
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USA, NY, New Hampton
Joined Jan 2005
692 Posts
Quote:
Originally Posted by erh7771 View Post
Blades look like they're slightly above shroud rim, smoother air with the rotor as deep in shroud as possible... more thrust possibly
Mine was like that also, I took the adapter in my lathe and drilled it a little deeper, I guess you could also cut down the motor shaft a little.
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Old May 19, 2012, 03:42 PM
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AirX's Avatar
Joined Nov 1999
13,635 Posts
Quote:
Originally Posted by erh7771 View Post
CP 480 2500kv with 65c 6s 3300 Nano's

109 amps, 23.6 volts, 6lbs 2oz thrust peak....volts held stead !

If you're going to run that motor with 6s I wouldn't do it with > 40c Nanos...tried the same pack on another plane and amps went up 20pts on it also...I didn't think the amps would rise that much on a volt

The CP motor I burnt was on a 65c nano, surprised it held up that long
erh7771,

40c works really well for me in my Wemotec 90mm. It holds voltage for a lot longer on the discharge curve than 30c/20c etc.

If you have enough capacity it will deliver well more current than a motor this small can handle.

The motor will try to turn the rpm of its kv (rpm/volt). If the load is high then the battery will supply current till the kv is satisfied, the power is watts = amps X volts which is a balance between the amps and volts. When current rises voltage drops, if the battery is capable of a lot of capacity or low resistance it will sustain higher current values.
Since your motor is drawing such high amperage it is out of a good efficiency rang and producing a lot of heat, just needs a longer motor to produce a stronger magnetic field which will lower the current needed to make the same power or better. High heat like that will weaken the motor mount and something will fail or you need to go to an aluminium shroud to help disipate the heat.

Cheers,
Eric B.
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Old May 19, 2012, 08:29 PM
"LiPo-Blaster"
RugFlyer's Avatar
Duluth, GA
Joined Apr 2009
932 Posts
Quote:
Originally Posted by viperviper View Post
oopppss.. missed out the thrust.

2w18 - 1.5 kg without intake lip and 1.7Kg with intake lip...in my F22...fly like a racer...
2w25 - 1.46- 1.5kg with intake lip...using a weak lipo...

Looks like 2W25 is more efficient.
Any numbers with the 2W-25/CS-10 on 5S yet? Seems it would be a doable since its 2720KV and is pulling 50-55 Amps on 4S. It's also rated at 70Amps and up to 6S.

Quote:
Originally Posted by Goody63 View Post
Probably been mentioned before but I basically one of the CS housings by over-tightning the motor mounting screws in my J-11B tonight.

I was fitting a couple of new 2855 2300kv's (for a 5S setup) and noticed one of the motors wasn't straight in the housing.

Closer investigation revealed that when I had been tightening the grub screws the plastic around the mounting holes had deformed and pushed back towards the motor. This has caused the motor to mount off centre (and rub on the housing).

The fact that I had been cooking the original HK 2800KV motors on 4S in the housings may have also had something to do with it?

So now I've got to wait for HK to get the CS Fans back in stock unless someone else knows a good supply spot (or even better, somewhere you can just buy the housing)?
Goody, good to see you're working on the J11B, mine should be here Monday!
Speaking of the CS Housing mounting holes, I use 3mm washers with all four mounting screws and it centers the motor and has worked fine in my housing's.

-Rick
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Last edited by RugFlyer; May 19, 2012 at 08:40 PM.
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Old May 19, 2012, 09:57 PM
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Thomas Nelson's Avatar
Calgary, Alberta, Canada
Joined Sep 2002
2,903 Posts
Hi Eric

Yeah, erh7771 is actually using a Cyclone Power unit which has the motor on a stand-off, well back of the motor mount. This places the motor away from the mount and in the airflow, which is probably why this 145 gram motor can handle that crazy amount of power without nuking itself or melting the mount. In fact, this is the same kind of power my 330 gram HET (also 6S) sees when spinning my 90mm CS12 setup.

tn

Quote:
Originally Posted by AirX View Post
erh7771,

40c works really well for me in my Wemotec 90mm. It holds voltage for a lot longer on the discharge curve than 30c/20c etc.

If you have enough capacity it will deliver well more current than a motor this small can handle.

The motor will try to turn the rpm of its kv (rpm/volt). If the load is high then the battery will supply current till the kv is satisfied, the power is watts = amps X volts which is a balance between the amps and volts. When current rises voltage drops, if the battery is capable of a lot of capacity or low resistance it will sustain higher current values.
Since your motor is drawing such high amperage it is out of a good efficiency rang and producing a lot of heat, just needs a longer motor to produce a stronger magnetic field which will lower the current needed to make the same power or better. High heat like that will weaken the motor mount and something will fail or you need to go to an aluminium shroud to help disipate the heat.

Cheers,
Eric B.
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