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Old Dec 10, 2011, 02:49 AM
Lee Liddle
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Carrollton, Tx
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Originally Posted by falcon5 View Post
1700kv will be too much. I have a 1400kv motor in a Stu 90 on 8S and pulling 90 amps and that's at 5000 feet above sea level, I would be over 100 amps a few thousand feet lower. Tell him to try 6S first, he should see around 100 in amp draw with 6S.

True, 6s will be the max is my guess. It may not even work on 6s. My ARC 75-1t is 1680kv and in a Midifan pulls 130a on 8s. With the CS-12 it would probably be over 160a.
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Old Dec 10, 2011, 06:31 AM
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There is 8 mm shaft version on the X-flight now
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Old Dec 10, 2011, 07:11 AM
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Nice. What would ne nicer is if they would offer just the adaptor for $5 fo those of us who already have the fan. Although it is a nice excuse to get another fan.
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Old Dec 10, 2011, 09:54 AM
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Finally got to test the lander shroud this is with the std Lander 1280kv on 10s the data logger is a new one and live mode did not record so did a quick recording without a live screen wot 3.2 kg thrust 131a 4.2 KW at 2 KG thrust 52a 1.9 KW ay 1 KG thrust 37a 1.2 kw the cells had allready had a hiding so recharging and making sure data will record in live.looks like wot will need to be short turbo boost type bursts but plenty of poke still at half stick.
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Old Dec 10, 2011, 09:57 AM
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Forgot to mention those results are with the hawk eflux tube fitted
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Old Dec 10, 2011, 10:18 AM
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Quote:
Originally Posted by Gaz-b View Post
Finally got to test the lander shroud this is with the std Lander 1280kv on 10s the data logger is a new one and live mode did not record so did a quick recording without a live screen wot 3.2 kg thrust 131a 4.2 KW at 2 KG thrust 52a 1.9 KW ay 1 KG thrust 37a 1.2 kw the cells had allready had a hiding so recharging and making sure data will record in live.looks like wot will need to be short turbo boost type bursts but plenty of poke still at half stick.
wot 3.2 kg thrust 131a 4.2 KW
If I remember correctly the wemo does allmost 4,5 kg at 3,5 kW.


That is a disappointing cause I love the sound
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Old Dec 10, 2011, 10:32 AM
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anyone know is this CS 12 blade is balanced?

this rotor needs balance?
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Old Dec 10, 2011, 10:45 AM
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Originally Posted by Samjet View Post
wot 3.2 kg thrust 131a 4.2 KW
If I remember correctly the wemo does allmost 4,5 kg at 3,5 kW.


That is a disappointing cause I love the sound
That's with a thrust tube, I get over 9 pds on high cell count 3000 watts
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Old Dec 10, 2011, 10:47 AM
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Originally Posted by wanaka View Post
anyone know is this CS 12 blade is balanced?

this rotor needs balance?
Centrifugal balance if you have have a long enough motor shaft
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Old Dec 10, 2011, 11:56 AM
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The thing with any multiblade fan is that matching the right motor with the right number of cells is much more complicated than achieving this with a 'normal' fan.
If you look at the CS70 fan, it would appear that relative low kv motors with a slightly higher weight are the way to go. I bet it won't be any different with this one...
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Old Dec 10, 2011, 12:11 PM
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What I cant wait to see is the performance difference when its in the airframe and in unloads with airspeed.
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Old Dec 10, 2011, 12:16 PM
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I think this is going to start a long discussion on this BUT EDF Do Not unload.
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What I cant wait to see is the performance difference when its in the airframe and in unloads with airspeed.
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Old Dec 10, 2011, 12:25 PM
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That kinda defies logic I will see what the logging reports compare the system in the airframe static and flying see if at a given rpm the amps drop or not.
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Old Dec 10, 2011, 12:55 PM
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I'm afraid Billydsrc is right on this one, I have had this discusion before and was proven wrong as I could swear I could hear the fan unloading in the air but it was not to be. our motors will always go to its rpm based on the kv of the motor and voltage given at a cost of amps so as a fan unloads it doesnt go higher rpm it just stays at its kv/dcv/fan load rpm. maybe at a lower amp draw, if load increases too much amps and heat go up and and failure occures.

one of the ways I proved this to my self was to put a keychain cam on my jet and record a flight you can really hear that the motor never does increase rpm during a flight no matter what I did (vertical climb outs,diving) it stayed the same no matter what the external load on the fan was.
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Old Dec 10, 2011, 01:03 PM
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So I am right then it's the decrease in amps I am looking for.
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