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Old Aug 08, 2012, 08:58 AM
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United States, TX, Grand Prairie
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Originally Posted by PAPE View Post
Here is my phase 3 F16 with CS10

This is a short kinda crappy vid from today, but gives you an idea of what a good balance job will do, the flight is all WOT till the battery drained zippy 2650 4s

the sound is good its verry close to what it sounds in person by the way it was filmed with an Iphone 4s, and it does pick up good sound from the airframe.
..
Nice, what's your setup?

TIA
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Old Aug 08, 2012, 12:44 PM
speeddemon
United States, TX, Whitesboro
Joined Jun 2011
138 Posts
So I just bought a Changesun 10 blade fan today and thinking about a setup that will work with the motors i have availible. First off i have a meteor stock 3000kv motor that im using a 4s and 5 s on. second i have a HK 2800kv motor, then a Blitzrcworks 2300kv motor. What im wanting to know is what would be the best out of these motors that would work good with a 4s and 5s. though i only have 1 5s and 3 4s's... im thinking more towards the 2800 kv with a 4s . Also running with 100amp esc
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Old Aug 08, 2012, 01:09 PM
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Originally Posted by tofast4u View Post
So I just bought a Changesun 10 blade fan today and thinking about a setup that will work with the motors i have availible. First off i have a meteor stock 3000kv motor that im using a 4s and 5 s on. second i have a HK 2800kv motor, then a Blitzrcworks 2300kv motor. What im wanting to know is what would be the best out of these motors that would work good with a 4s and 5s. though i only have 1 5s and 3 4s's... im thinking more towards the 2800 kv with a 4s . Also running with 100amp esc
What's it going in?

Looks like 2800kv on 4s would do good but will burn up on 5s
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Old Aug 08, 2012, 01:33 PM
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Fairborn, OH
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In addition to the KV, what is the length of each motor? Mass and inertia helps spin the high blade count of the ChangeSun 10 blade fan.
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Old Aug 08, 2012, 03:20 PM
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Originally Posted by alexandermh View Post
In addition to the KV, what is the length of each motor? Mass and inertia helps spin the high blade count of the ChangeSun 10 blade fan.
+1

This should be it's on thread in EDF Talk..

I'm finding the higher the mass of the rotor the less thrust UNLESS it has some minimum mass motor "parts" to turn it...all things being equal (such as it has some efficient stators to go along with it)

The Eflight 80mm rotor is one of the most efficient rotors for that size mostly because of it's weight and strength... I've confirmed it gets 5.5lbs of thrust at 1300 watts...I used a smallish 2100kv motor to get the settled thrust.

>12lbs at 3000 watts (2 eflight fans with tapped timing) should be a floor for performance.
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Old Aug 08, 2012, 03:58 PM
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Skunk Water, Rhode Island
Joined Jul 2002
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I was looking for low power set-up for another RBC Skyhawk. My last used the minifan, Kontronic 400-23, and 1800-5s LightMax. This was a great set up, that allowed me to get the Skyhawk in at 30oz. Watt meter readings were 27A@525W. 250W per# is a good power to weight ratio that gave unlimited vertical.

I took the stock CS fan, static balanced the rotor. Attached a small sq of vinyl tape to the inside of the spinner. I kept turning the spinner trying to dynamically balance the unit. I had to move the tape once, to get it very smooth.

The motor I chose is the Mega 16/15/4(2200Kv, equal to the HET 4W) Turnigy Plush 60 on med timing, and 4s 2200 LightMax 40c I'm not able to measure static thrust, But it is more than ample to provide 1-1 thrust for a light jet. I ran two packs through it and got 5 minutes of varied thrtle settings, leaving 25% cap in the batteries. I only use full power in verticals.

My preference, is to have scale performance through light built-up airframes and light power systems. After both successive runs, the motor was very warm. And ESC and batt only warm. So, in certain instances, a short can motor can be used in the CS10.

What really amazed me, with this fan, was how much static thrust was still available at 50% power, on this power. I know most of you are running very high power levels, and thats your thing. But, I feel there may be some looking for a a lighter, lower power, way to fly a jet. And still enjoy the better sound afforded by this fan.

Fuzz
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Last edited by St. Martin; Aug 08, 2012 at 04:05 PM. Reason: wrong watt number on kontronic 5s
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Old Aug 08, 2012, 05:30 PM
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AirX's Avatar
Joined Nov 1999
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Originally Posted by alexandermh View Post
In addition to the KV, what is the length of each motor? Mass and inertia helps spin the high blade count of the ChangeSun 10 blade fan.
Yup, motor mass and external can area define how much heat and how fast that heat is dissipated.
Linking weight to wattage produced gives a good indication what motor will perform longest in any application. A range of 5-10 watts/gram points to a range of motor sizes that will work, ie 650watts/97grams = 6.7watts/gram coefficient which is what an HK L2850-2300 on 4s in the CS70. Lower the coefficient number the lower the heat load, high the number reflects the higher heat load etc.
The weight of the motor equates to its diameter and length so it will help to determine what length motor to get for the anticipated load/heat load of the motor.

Eric B.

PS Dividing the watts you expect by the lower range coefficient of 5 will give the upper weight range of the motor you want to find, dividing the watts again by the higher coefficent number 10 will give the lower weight range of the motor you want to find. for example 650/5=130 and 650/10=65 for the range of 65gram to 130gram motor weight where the lighter motor will not last as long as the heavy motor so the middle might be the best option. I usually take a look at the conditions the motor will have to work in and make my choices to fit my needs.
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Last edited by AirX; Aug 08, 2012 at 07:11 PM. Reason: Spelling, added PS
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Old Aug 08, 2012, 06:11 PM
speeddemon
United States, TX, Whitesboro
Joined Jun 2011
138 Posts
Its a 79mm can length erh7771. and its going in my meteor. 28mm diameter
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Old Aug 08, 2012, 06:13 PM
speeddemon
United States, TX, Whitesboro
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the 2800kv sorry and the 2200 is 72mm long and 28mm diameter
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Old Aug 08, 2012, 06:15 PM
speeddemon
United States, TX, Whitesboro
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So the 2200kv would be good for a 5s due to lower rpm. mabey i should just stick with my 5 blade edf fan unit and live with it lol but i want that turbine sound like everyone says it has
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Old Aug 08, 2012, 06:50 PM
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5S 2300kv (2200kv would still do) CS10... Meteor = awesome sound and good speed.
So for that plane you definitely want to aim for that!!

"72mm long".... better to just tell us the actual motor model.
20mm of the 'length' could just be the tail cone of an outrunner etc.

But anyway, even a 'weakish' 2300kv will drive the CS10 on 5S.
eg The L2855 is a lower end of the typical 28mm motor sizes, and does it totally fine.

For 2200kv you will probably lose close to 0.1Kg thrust compared to a 2300kv
2300kv, 1.45kg bench thrust, about 1.1 Kg to 1.2 Kg area in a Meteor.
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Old Aug 08, 2012, 08:14 PM
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Originally Posted by tofast4u View Post
So the 2200kv would be good for a 5s due to lower rpm. mabey i should just stick with my 5 blade edf fan unit and live with it lol but i want that turbine sound like everyone says it has
2200 would be good on 5s and maybe on 4s if the plane is light enough...take a pic and lets see the motor

Around 2300kv seems to be a sweet spot for the fan on 4, 5 and 6s if your motor is big enough...

Listen to some of the vids, you'll love the sound and the performance is nothing to sneeze out no doubt

Let us know, take vids...

.I lurk for vids....

part of my morning coffee ritual
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Old Aug 08, 2012, 08:23 PM
speeddemon
United States, TX, Whitesboro
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will do, ill have pictures in the mornin! and the 72mm can length is including the shaft.. and its surprising how 100kv makes that much of a difference? wow lol. And i dont really have a video camera except my android haha it takes good enough to atleast hear it and get a good pass or so
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Old Aug 08, 2012, 08:28 PM
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United States, TX, Grand Prairie
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Quote:
Originally Posted by tofast4u View Post
will do, ill have pictures in the mornin! and the 72mm can length is including the shaft.. and its surprising how 100kv makes that much of a difference? wow lol. And i dont really have a video camera except my android haha it takes good enough to atleast hear it and get a good pass or so
If the motor has some head room meaning the windings and magnet are big enough to turn watts into RPM then you can experiment with tappin the timing to get a KV or two of RPM out of the motor....65c packs are worth 1 or 200kv on some setups also.
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Old Aug 08, 2012, 08:31 PM
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Hey, you can't say 2300kv is the 'sweet spot' for 4S, 5S, and 6S.
They are massively different results.
Each cell count has its own 'sweet spot'.

But typically you would want:
4S 2650kv area
5S 2300kv area
6S 2000kv area

I guess I could say these KV's give 'sweet spot' outputs for the current/watts input, in that they are 'medium' current and can use motors of 'medium' ability, for a quite good thrust output that is around the typical need for that aircraft use.

To move up the scales of output power, you use higher KV for that cell count (moving above my list) but the input costs (Amps) goes up faster than output gains, and you will also need a heftier motor. eg HET, Leopard etc. Sort of a scale of more $ per motor to do that higher power job adequately.

As an example. 6S 2000kv is an 'sweet spot' 'easy' level for most motors.
As you go to 2100kv, then 2200kv, the numbers - input and output - are moving up reasonably fast and so will the motor cost and battery capability needs.
Every 100kv is an amount of note to move up in a CS10. By 2200kv you already really want a HET level of motor. (eg 2W30)

And eg 5S
2300kv the 'lowish end' L2855 motor type does fine.
But by 2500kv you want at least a Cyclone 480 level of motor size/ability (and better batteries too of course).

4S... 2300kv is totally useless really. The starting point is 2600kv area.
By 2800kv area you are needing a decent motor type.
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