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Old Nov 04, 2011, 05:36 AM
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HobbyKing Mercury Alloy 64mm 4700KV EDF Unit

These have just appeared on the HK website and they look interesting. I wonder if they are going to quieter. From the looks of it they push although i cant be sure. With any luck we might see a 90mm fan.

In conventional ducted fan design, the motor is secured to the stator hub while the fan secured to the motor shaft. During operation, any imperfection in either the motor or fan will cause both the fan and motor to vibrate at a certain resonance frequency. The oscillation can cause the blade tip to rub against the shroud of the duct. Moto-turbine’s 3-bearing system reduces resonance vibration by 90%.

Motor: 2430-4700kv High Performance EDF Brushless
EDF Unit: 64mm
Battery: 7.4v ~ 14.8v (2s ~ 4s Max)
AMP Draw: 76 amp (Max)
Watts: 1140 watts (Max)
Thrust: 1600g
ESC: 40A~80A
Unit Weight: 162g

Test Data:
11.6v (3s) 2600mah / 54amp / 626watt / 1040g Thrust
12.0v (3s) 5200mah / 57amp / 684watt / 1100g Thrust
14.6v (4s) 2600mah / 73amp / 1066watt / 1550g Thrust
15.0v (4s) 5200mah / 76amp / 1140watt / 1600g Thrust


http://www.hobbyking.com/hobbyking/s...it_2s_4s_.html

This one does 5s

http://www.hobbyking.com/hobbyking/s...it_3s_5s_.html

The do look nice though.

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Old Nov 04, 2011, 09:28 AM
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Perth, Australia
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Is it suggesting that it has bearings on both ends? - edit - yes it does, theres a bearing in the tail cone section too.

Even has 4 blades within the motor tube to help pull air through the motor nice..
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Old Nov 04, 2011, 09:48 AM
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United States, TX, Grand Prairie
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Another interesting design feature of this this is the stators in the front and back of the fan.

It gets 4lbs of thrust on 5s, not bad....
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Old Nov 04, 2011, 10:29 AM
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oooo - nice. Could be a real competitor for the lander units if they produce 70mm units and up. Imagine that sort of technology in an 80mm unit running 12s at a modest current - HABU 32 anyone?
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Old Nov 04, 2011, 10:34 AM
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Are they not similar?

http://www.hobbyking.com/hobbyking/s...dproduct=15171

I was eyeing this back ordered item when I noticed the new mercury allow 64mm edf. Other than the colour, the described features are similar? But check the difference in price? 36% premium for that gun metal look?

Ok the mercury will go 5s, and it has a higher thrust? Err 36% premium?

A second point is the front stator doesn't seem to guide airflow onto the foils. Looks more like spar support than functional stators to me.
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Old Nov 04, 2011, 01:55 PM
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It seems to be from epf hobbies:
http://epf.com.tw/goods.php?id=125

They dont have a 70 and 90mm (yet).
So i gues hk wont get it (soon).
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Old Nov 04, 2011, 04:54 PM
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90mm is to be released this month.

The mercury is more powerful than its predecessor, and has a metal tailcone, the old one was plastic. Also, looks like way more machining in the blades as they're much more complex shape. That's the $30 premium right there.
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Old Nov 04, 2011, 04:58 PM
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this is the EPF Hobby fan that's over on the foamie thread. good to see HK finally got a hold of it. the reason it costs more is because it's metal, not plastic. the whole thing is metal, including the rotor, from what I remember on that thread. there's video of it flying on that thread, if you wanna hear what it sounds like.

Rich
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Old Nov 04, 2011, 05:57 PM
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The previous one also had a metal rotor.
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Old Nov 05, 2011, 01:01 PM
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Check out the HK main page...there is a product video on this EDF.

HobbyKing Daily - Mercury Alloy EDF Unit (1 min 30 sec)
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Old Nov 10, 2011, 03:40 AM
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Netherlands, Zwolle
Joined Jul 2005
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Exciting times to be in small (64-70mm) EDF these days... With the 10 blade CS fan and this one as well.
I'm somewhat surprised though that this fan doesn't get as much attention as I would expect. This seem to be a well-made and balanced unit that puts out impressive numbers.
A 64mm unit that puts out 1,5 kg at reasonable efficiency (i.e. more than 1,2 g/W) should open the door for scale sized inlets/outlet on lets say a 1,2m Panther as long as you keep weight down to 1,5-2kg. Or am I missing something.
Anyone has some real-life experience with this one?
What about the sound of this 8-blade rotor?
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Old Nov 10, 2011, 05:23 AM
You win again gravity!
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I think they're great. I had a couple of the previous mototurbines and these are even better. Truly beautifully machined blades, and perfect balance. And at HK prices, a hell of a lot of fan for the money!
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Old Nov 10, 2011, 09:35 AM
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I have two of them on their way to me now. Will post info/vid's as soon as I get them.
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Old Nov 10, 2011, 09:46 AM
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Would love to hear this thing run at half and full throttle... EPF's own Youtube contributions aren't that clear. At least I didn't hear the typical high pitched edf wyning, but not sure if it is as whooshy as the CS10-70mm.
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Old Nov 10, 2011, 04:07 PM
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according to EPF, the 90mm version should be out in a month and the 70mm will be out in January.
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