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Jul 19, 2012, 04:48 AM
The best in EDF since 2005
Extreme_RC's Avatar
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New Product

Extreme 127mm Alloy Ramtec with the new 5075 inrunner!


Finally I have the new EXTREME 127mm Ramtec fan unit complete with the hot new 5075 inrunner!

Very happy with the end result, ready to install weight including the motor cover is under 1100 grams, and the power output is brilliant! I will get video of it this weekend as its worth seeing the figures in real life.

Basic setup is Extreme CNC Alloy 127mm 6 stator housing with matching Alloy motor cover, custom Ramtec rotor with flat collet adapter hub, and the new 5075 inrunner, 8 poles and huge power handling.

Initial testing today with my old 5000mah 30c packs and AS inlet lip attached, 7-8 seconds WOT after slow spool up:

41.7v / 115A / 4795W / 22,500rpm / 7.7kg thrust!

With some fresh 6000mah 35c packs this is going to hit 8.5kg thrust I reckon, and should hold 8kg.
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Jul 19, 2012, 08:16 AM
Registered User
erh7771's Avatar
NICE!!!

VERY NICE !!

> 17lbs of thrust and doesn't weigh 4lbs

How fast did it dissipate the heat from the inrunner (as if it really matters 5075 is a big boy)

Do you think the inrunner can go 25% more RPM than it has right now?

If so you think we're talking about 25lbs for 6500 watts?

PM'd
Jul 19, 2012, 01:29 PM
1.21 GIGAWATTS!!!
Hmmmmm......
Jul 19, 2012, 05:21 PM
The best in EDF since 2005
Extreme_RC's Avatar
Thread OP
Quote:
Originally Posted by erh7771
NICE!!!
VERY NICE !!
> 17lbs of thrust and doesn't weigh 4lbs
How fast did it dissipate the heat from the inrunner (as if it really matters 5075 is a big boy)
Do you think the inrunner can go 25% more RPM than it has right now?
If so you think we're talking about 25lbs for 6500 watts?
PM'd
No, she weighs 2.4lb, in fact I think its a little under that but I will double check that now its fully assembled, soon as I have done the test stand video.
I am running it with the LIGHTNING 100A ESC too, sitting on the stand behind the fan, it doesnt seem to care whether it runs at 100A or 120A, doesnt get hot with the heatsink in airflow.

My recommended package would be the Platinum PRO 120A HV ESC which is rated to 150A+ short term and is a supoer tough ESC.

There was hardly any heat, I didnt really run it long enough to generate any LOL. I will run it for a good minute or so WOT when I do the extended testing, then shut it down and let it sit while checking temp through the back of the motor cone. The housing pulls heat out fast though, I havent thermal pasted the motor in yet as it was purely a need to test something new I will do that tonight, and finish assemble the fan to its ready for sale stage, then do the video testing.

But from experience with my other setups, the motor will definitely take more power due to the heatsinking and convection properties of the housing. The motor tube walls are 3.5mm thick, the motor case is around 1mm thick so I have a good sinking ratio there, then the convection cooling through the stators and housing is amazing to feel, 3000w 90mm fans running flat out for a minute or two on the stand, then slow them down and feel the housing, the warmth is right through the stators and being pulled out constantly by the airflow, the motors never seem to get hot so the thermal transfer compound is doing its job too.

As for more power, am going to test it on 14s soon as I have a new 14s controller at hand. I imagine up around 160A and yeah, getting close to 25lb would be pretty exciting. If the housing does as well as the smaller ones then the motor may very well survive being run hard most of the flight.
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Jul 19, 2012, 05:27 PM
Fly it like you stole it !
bobbit4447's Avatar
Quote:
Originally Posted by Extreme_RC
Finally I have the new EXTREME 127mm Ramtec fan unit complete with the hot new 5075 inrunner!.
Mark..whats the difference between old/new 5075 ?
Jul 19, 2012, 05:30 PM
Registered User
erh7771's Avatar
Quote:
Originally Posted by Extreme_RC
...As for more power, am going to test it on 14s soon as I have a new 14s controller at hand. I imagine up around 160A and yeah, getting close to 25lb would be pretty exciting. If the housing does as well as the smaller ones then the motor may very well survive being run hard most of the flight.
Cool!

Are you going to run it on the SunRise (HK's YEP) esc on 14s?

Regards
Jul 19, 2012, 05:51 PM
Registered User
Herby_007's Avatar
This new fan is going in my ASM Panther, looks like I wont need to go past half throttle.
Last edited by Herby_007; Jul 19, 2012 at 06:13 PM.
Jul 19, 2012, 06:13 PM
The best in EDF since 2005
Extreme_RC's Avatar
Thread OP
There is no old 5075! LOL, its an all new motor, thats my meaning sorry, new design inrunner, I have been wanting to get away from the outrunner in big fans idea for ages, especially considering my fan was originally designed to be a huge heatsink, now its finally come.

Photos and video will come by Sunday, hopefully I clear last backorders today, its taken 5 days to burn this Flu out. Should not have been testing yesterday but there are more important things than flu to deal with
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Jul 19, 2012, 06:18 PM
world's slowest builder
Air-Jon's Avatar
This sounds amazing! Hopefully this is the lightweight, inexpensive 12s 127mm plug n play system that really meets most expectations. I dont think there is really a competetor if it does....not at this price point. Will you as part of you testing...hook it up to 24Volts and run the thing for about 4-8 hours. This should be a good test of the bearings for typical life of an EDF. Good luck...I want one!
Jul 19, 2012, 09:19 PM
Bypass Ratio = Infinity
scatsob's Avatar
What is the KV and how much will it cost for just the motor? Looking forward to the pictures and video.
Jul 20, 2012, 07:27 AM
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Extreme_RC's Avatar
Thread OP
Ok took a little video today Its cold here, you can see from the voltage drop that the packs are cold and old so please dont comment on voltage, its purely a glimpse at what the fan can do, will run it again on weekend with some 6000 35c packs. I just stuck it in the courtyard behind the workshop so its a bit roughly set up but the figures are accurate!

Extreme RC's 127mm CNC Alloy Ramtec Fan with our new 5075 inrunner! (2 min 44 sec)
Latest blog entry: Extreme RC AUSTRALIA
Jul 20, 2012, 11:38 AM
3DHOG
jcdfrd's Avatar
how about pics of the rotor and motor
Jul 20, 2012, 01:09 PM
Classic jets rule
AIR SALLY's Avatar
nice ...it's all in the inlet ring it sounds good too .have you tried that motor with a dynamax rotor?if it can pull the Ramtec it will like the dynamax even better .
Jul 20, 2012, 02:26 PM
****member
Arngeir Blakseth's Avatar
With a 590kV it will be really nice on 15S with a Dynamax rotor.
Jul 20, 2012, 02:40 PM
Registered User
bri6672's Avatar
Did you change the pitch of the blades?? We have tested the ramtec and found pretty high amps vs thrust... what makes it different other than the motor?


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