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Dec 16, 2011, 11:06 AM
3DHOG
jcdfrd's Avatar
Quote:
Originally Posted by Odysis
I agree - particularly on RCG, most of us are just here for fun, so have no vested interest.

That said, with the information already out there on the fan, it wouldn't be hard to figure out what he used...
exactly!!....so it isn't really a secret then is it? funny I thought RCG'S was an information sharing site. I can understand him being hush hush until he's figured out his setup and has a product to sell but once you put it on your website for sale well then the cat is out of the bag! I mean really do you have to sign a non-disclosure form when you purchase the fan?...I dont think so. it seems very short sighted on his part. I have no beef with Mark and actually am one of his biggest fans of his products, the 90mm Extreme Alloy Wemo is by far the best value 90mm fan you can buy IMO. I know because I use one. it is killer!! and sounds every bit as good as these fans do. the guy thats going to spend 200 dollars on 70mm PNP fan doesn't care what motor is in it. the guys that are buying 15 dollar fans and 40 dollar motors aren't going to spend 200 dollars on a fan/motor setup so stop shooting yourself in the foot.
ok rant over
could you please reveal the 6s motor you are using (2w25?) and what rpm you are achieving at 65amps to get 4.6lbs of thrust
Last edited by jcdfrd; Dec 16, 2011 at 11:43 AM.
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Dec 16, 2011, 11:32 AM
Mile High EDF
420flyboy's Avatar
Quote:
Originally Posted by ysolomon
It kills me when someone asks "you only have 3.5 minutes of flights with this battery???", not realizing what it means to fly a jet 3 feet above runway at 120mph... You can't do this for more than 3.5 minutes without catching your breath afterwards... Oh, and you can't stop blinking for more than 3.5 minutes... Or, try flying a jet at 120mph 3ft above runway and blink...
Well said

selling my setup
https://www.rcgroups.com/forums/show....php?t=1557304
Last edited by 420flyboy; Dec 16, 2011 at 12:30 PM.
Dec 16, 2011, 12:39 PM
Registered User
balistc1000's Avatar
Quote:
Originally Posted by beachflyer
It would be nice to try a aluminum fan shroud. Dont have one right now. My last shroud I had melted and I am using one I had. I dont think its as quiet as the one that melted. I had short outrunner and it couldnt stand the temp and melted itself and everything connected. I have used inrunners here at beach and found with the humidity its best for me use outrunner to keep heat down in summer.
beachflyer, do you know how many amps you are pulling with the new motor?
Thanks.
Dec 16, 2011, 12:50 PM
RC since 1979!! AMA 112747
beachflyer's Avatar
[QUOTE=turbonut;20154500]use volts under a load(3.5v give or take) times the motor KV..subtract 15 percent and you will be in the ballpark...so more like 39000 if your lucky[/QUOTE

14 volts was under load at 79 amps X 3300= 46200X .85
= 39270 RPM

So 39270 is about what I am turning. I can live with that. My jet is quick, has really good verticle, but not using so much power that I worry about life of battery and motor components.
Dec 16, 2011, 01:44 PM
Hey Ya'll!! Watch THIS!!
Michael Paxton's Avatar
That means I'm getting 42K out of my Eflite 3600 and Plush 60 static!
13.8V X 3600 -15% =42228 (voltage taken AFTER 15 secs...so probably low)
And I know from the sound that it's getting more RPM in flight.
Dec 16, 2011, 02:00 PM
RC since 1979!! AMA 112747
beachflyer's Avatar
Quote:
Originally Posted by Michael Paxton
That means I'm getting 42K out of my Eflite 3600 and Plush 60 static!
13.8V X 3600 -15% =42228 (voltage taken AFTER 15 secs...so probably low)
And I know from the sound that it's getting more RPM in flight.
That has to be tough on your 60 amp controller since I am pulling 78 amps on the ground using 300kv less than you.
Dec 16, 2011, 02:14 PM
Hey Ya'll!! Watch THIS!!
Michael Paxton's Avatar
I think the plush down speeds the out put to keep it in line. But I never hear it.
When I go from half to full before I toss it for take off..The rpms go to full (Whatever that is) and stay there til I let off. And that is around 70 amps. ESC is rated to 80 for 10 secs. But batts are really 62 amps continuous.
So really? I'm over working the entire setup....But it rocks right now! LOL
Dec 16, 2011, 02:35 PM
Registered User
Jacques.Eloff's Avatar
Quote:
Originally Posted by jcdfrd
exactly!!....so it isn't really a secret then is it? funny I thought RCG'S was an information sharing site. I can understand him being hush hush until he's figured out his setup and has a product to sell but once you put it on your website for sale well then the cat is out of the bag! I mean really do you have to sign a non-disclosure form when you purchase the fan?...I dont think so. it seems very short sighted on his part. I have no beef with Mark and actually am one of his biggest fans of his products, the 90mm Extreme Alloy Wemo is by far the best value 90mm fan you can buy IMO. I know because I use one. it is killer!! and sounds every bit as good as these fans do. the guy thats going to spend 200 dollars on 70mm PNP fan doesn't care what motor is in it. the guys that are buying 15 dollar fans and 40 dollar motors aren't going to spend 200 dollars on a fan/motor setup so stop shooting yourself in the foot.
ok rant over
could you please reveal the 6s motor you are using (2w25?) and what rpm you are achieving at 65amps to get 4.6lbs of thrust
I very much doubt it's a 2W-25. KV will be too high for one these highly loaded fans on 6S. It's gotta be the 2W-30 (which has a longer can too!). Mark - tell me I'm right

Think I'm gonna have to order one for myself. I already have one of these CNC housings (with an ARC 28-58-1) and it's awesome just to look at.

Jacques
Dec 16, 2011, 02:35 PM
Pro Hoarder
turbonut's Avatar

give or take some


Sounds like it may be the case..remember I am just using approx 15% loss in the system to get a est...at higher KV it may be more but it allways been a good way to guess at a setup...I lso am going to test the 3600 on my fan..just finnished ballancing the rotor so it will be up next on the test stand

Quote:
Originally Posted by Michael Paxton
That means I'm getting 42K out of my Eflite 3600 and Plush 60 static!
13.8V X 3600 -15% =42228 (voltage taken AFTER 15 secs...so probably low)
And I know from the sound that it's getting more RPM in flight.
Also when you test try to get the volts under load( no guessing) so you can get a better est of rpm as you will be suprized how much batts can sag when loaded hard. I just tested my CS90 12 blade and the batts dropped to low volt cut under the load..esc was set to 3.2v per cell..and they are rated to 40c..but that is what happens when near 3k watts
Dec 16, 2011, 02:43 PM
3DHOG
jcdfrd's Avatar
Quote:
Originally Posted by Jacques.Eloff
I very much doubt it's a 2W-25. KV will be too high for one these highly loaded fans on 6S. It's gotta be the 2W-30 (which has a longer can too!). Mark - tell me I'm right

Think I'm gonna have to order one for myself. I already have one of these CNC housings (with an ARC 28-58-1) and it's awesome just to look at.

Jacques
you may be on to something there
I think your right I missed that one, this means the eflight stock Habu32 6s motor at 2150kv might be perfect fit for this fan on 6s
Last edited by jcdfrd; Dec 16, 2011 at 03:01 PM.
Dec 16, 2011, 02:58 PM
3DHOG
jcdfrd's Avatar
turbo
that is under load,the battery is getting slammed at 3.45vdc per cell after only 15sec and if he could see his rpm it would be at 40k or less. thats whats driving the amps up and battery voltage down

Quote:
13.8V X 3600 -15% =42228 (voltage taken AFTER 15 secs...so probably low)
Dec 16, 2011, 05:25 PM
Mile High EDF
420flyboy's Avatar
Here's a nice aluminum shroud and motor heat sink combo for this fan.
https://www.rcgroups.com/forums/show....php?t=1557301
Dec 16, 2011, 06:17 PM
Registered User
Quote:
Originally Posted by jcdfrd
turbo
that is under load,the battery is getting slammed at 3.45vdc per cell after only 15sec and if he could see his rpm it would be at 40k or less. thats whats driving the amps up and battery voltage down
Woud everyone who has not measured amps, volts and RPM please stop spreading misinformation about this fan. Nobody is spinning this fan at 45000+ RPM with less than 2500 watts. Were talking about 142 amps at 18.4Volts. That is unsustainable in a 28mm motor.

Here are REAL, MEASURED amps, volts, watts, RPM, as recorded by my Castle Ice2HV 120 ESC with a ARC 28-58-1 motor (3180kv):

With Inlet lip:

4s Fresh Charge Peak: 13.7V, 94.5A, 1300W, 37,803 RPM.
After 10 Seconds: 13.3V, 83.8A, 1115W, 35,818 RPM

5S Fresh Charge Peak: 18.4V, 142A, 2610W, 46,320 RPM
After 10 seconds: 17.0V, 130A, 2215W, 43,484 RPM

5S is a Neu Energy 5S 5000 46C

It looks to me like it takes a lot of power to spin this thing in the low 40's RPM. Approximately 3.3 Horsepower to turn it 46K RPM.

These are facts! It takes enormous power (for a 70mm fan) to spin this at over 40,000 RPM.
Dec 16, 2011, 06:39 PM
Bypass Ratio = Infinity
scatsob's Avatar
It would be awesome to have some thrust to go with those tests. Great numbers though, thanks.
Dec 16, 2011, 07:06 PM
3DHOG
jcdfrd's Avatar
Quote:
Originally Posted by rfodor
Woud everyone who has not measured amps, volts and RPM please stop spreading misinformation about this fan. Nobody is spinning this fan at 45000+ RPM with less than 2500 watts. Were talking about 142 amps at 18.4Volts. That is unsustainable in a 28mm motor.

Here are REAL, MEASURED amps, volts, watts, RPM, as recorded by my Castle Ice2HV 120 ESC with a ARC 28-58-1 motor (3180kv):

With Inlet lip:

4s Fresh Charge Peak: 13.7V, 94.5A, 1300W, 37,803 RPM.
After 10 Seconds: 13.3V, 83.8A, 1115W, 35,818 RPM

5S Fresh Charge Peak: 18.4V, 142A, 2610W, 46,320 RPM
After 10 seconds: 17.0V, 130A, 2215W, 43,484 RPM

5S is a Neu Energy 5S 5000 46C

It looks to me like it takes a lot of power to spin this thing in the low 40's RPM. Approximately 3.3 Horsepower to turn it 46K RPM.

These are facts! It takes enormous power (for a 70mm fan) to spin this at over 40,000 RPM.
rfoder
I totally agree with you this is why I said earlier that this fan hits the load wall at 40k, this is what we are seeing also. it is also why I keep asking mark to reveal his motor and rpm #'s claiming 4.6lbs thrust at 65amps on 6s, if true that appears to be decent performance. wasnt sure if you backing up my post or not


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