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Old Aug 16, 2012, 02:42 PM
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United States, TX, Grand Prairie
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Originally Posted by T-BONEZ View Post
That'll be fine, HK sells one with the same bell size but the thrust is marginal relative to 2800kv

I've flow the HK one...same KV...was the first fan in an LX F16...flow it fine

On 4s a little over 3.5lbs at around 70 amps..
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Old Aug 16, 2012, 08:57 PM
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United States, GA, Alpharetta
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Neu 1112/1Y 3500KV

Had a chance to fly my old (real old, over 100 flights) foam HABU with a CS10 and Neu 1112/1y 3500KV inrunner on 4S 5300 35C batteries. I went full throttle for take off and climb out and then to 2/3 throttle for the remainder of the flights. The two Turnigy Nano batteries lasted 3 minutes and went into LVC (power reduction).... landed safely. The Gens Ace 25C 5300 went the full 3:40 with no LVC. It had good power for a rapid climb out. It wasnt as fast as the Sapac MB1 on 5S but it wasn't slow either. The only problem was....... I couldn't hear it. It was absolutely the sound of silence. Not even a whoosh. But, I don't have my hearing aids as they were sent to the manufacyurer for recon.( I'm not deaf though, just high frequency hearing loss). It was really quiet! It is perfectly balanced, not a trace of vibration at any throttle position. This is a 4mm shaft Neu motor.
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Old Aug 17, 2012, 12:57 AM
Graham Dyer
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Johannesburg, South Africa
Joined Jul 2003
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Originally Posted by AirX View Post
Yup your right, i went in and removed it...

Your welcome.
I use a lot of the calculations in my spreadsheets. Klaus is/was the man and I am very greatful to him for taking the time to give us some of his knowlege here on the forum.

Eric B.
I would LOVE to know what Klaus thinks of the Changesun 10 blade...
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Old Aug 17, 2012, 02:09 PM
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I got some new numbers for the down sized CS90 posted in post 4716. using the 4074B 1400Kv motor I got 2.6kg at 2.1KW on 8 cell, still need to balance it a bit better then I will try to go for 9 and 10 cell
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Old Aug 19, 2012, 06:18 AM
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Got some new number today, with the same setup but with 10 cell's I got 3.6 Kg of thrust at at 3.5 Kw...not to bad for a 70mm fan. This was just a experiment to see if I could pull it of. But I guess I need to se it in action.
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Old Aug 19, 2012, 08:03 AM
advanced n00b
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United States, NE, Omaha
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Originally Posted by frank40 View Post
Got some new number today, with the same setup but with 10 cell's I got 3.6 Kg and thrust at at 3.5 Kw...not so bad for a 70mm fan. This was just a experiment to see if I could pull it of. But I guess I need to se it in action.
how many amps?
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Old Aug 19, 2012, 08:20 AM
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It pulled 100Amp's
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Old Aug 19, 2012, 08:35 AM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Originally Posted by frank40 View Post
Got some new number today, with the same setup but with 10 cell's I got 3.6 Kg of thrust at at 3.5 Kw...not to bad for a 70mm fan. This was just a experiment to see if I could pull it of. But I guess I need to se it in action.
That's actually a huge amount of thrust for a 70mm. It also indicates over 300mph for the efflux speed. That's very good. What was the sound like?
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Old Aug 19, 2012, 08:36 AM
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not bad!
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Old Aug 19, 2012, 08:49 AM
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United States, GA, Alpharetta
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Originally Posted by frank40 View Post
Got some new number today, with the same setup but with 10 cell's I got 3.6 Kg of thrust at at 3.5 Kw...not to bad for a 70mm fan. This was just a experiment to see if I could pull it of. But I guess I need to se it in action.
How many RPM? It had to be very high...... at least 50,000 RPM. I'm surprised the rotor didn't explode.
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Old Aug 19, 2012, 09:15 AM
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Originally Posted by Knife Liddle View Post
That's actually a huge amount of thrust for a 70mm. It also indicates over 300mph for the efflux speed. That's very good. What was the sound like?
LOUD!!!!! and it moves a Lott of air, It's sound relay god but I do have one small point at low rpm. where it resonate a bit , it could be the test stand not sure. Of curse the sound changes when installed in a duct, but time will tell. Acutely I am a bit impressed by this fan, as I mentioned it was just an experiment and it seems like it worked.

I don't have a "rpm meter" so I don't know. I think the stress on the blades are smaller than you think due to it a´has Ben cut down, they are very ridged build compeered to other a 70mm.

And thanks you Knife Liddle for inspired me.
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Old Aug 19, 2012, 09:33 AM
Lee Liddle
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Carrollton, Tx
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Originally Posted by rfodor View Post
How many RPM? It had to be very high...... at least 50,000 RPM. I'm surprised the rotor didn't explode.

Calculated from the kv and the voltage it would be somewhere near 45k. I agree that the cut down blades don`t have as much stress on them at the base, so that`s probably why it stays together. I think the centrifical force is what breaks the 90mm blades.
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Old Aug 19, 2012, 09:34 AM
Lee Liddle
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No problem. Feel free to post on my experimental 70mm thread if you would like.
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Old Aug 19, 2012, 11:37 AM
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United States, GA, Alpharetta
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I would sure like to see it repeated on another test stand for verification. That kind of thrust and eflux could dominate the 70mm fans. More thrust and eflux than the 90mm on 6S, 1500KV at 30,000 RPM. Only problem is high watts require big/heavy batteries for a 70mm size jet. Maybe in a twin 70mm.
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Old Aug 19, 2012, 11:48 AM
RAVI KOTHARI
Bombay,India
Joined Nov 2005
257 Posts
flew my cs fan in a dynam meteor on a het rc 2w25 with a 4s 4000 40C pack,
much better performance than the 25C packs.
drew 60 amps and climbs straight up.
i just love this fan.
power hungry it is, but just sounds so goooooood......................
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