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Old Jan 29, 2013, 04:26 AM
Registered User
Sydney, Australia
Joined May 2005
167 Posts
Hi Guys,

I was scouring the internet for possible motors for this aircraft with a Kv a bit lower than the 2630 that I am currently running on 5S with a 4.75x4.75 prop. I would like to run a bit bigger prop at a bit lower RPM for hopefully more efficiency.

I came across the EFlite BL32 Ducted Fan Motor, 2150Kv.

Type: Brushless Inrunner
Size: 32-size for Ducted Fans
Bearings or Bushings: Bearings
Wire Gauge: 14 AWG
Voltage: 14.8V - 22.2V
RPM/Volt (Kv): 2150Kv
Resistance (Ri): 0.026Ω
Idle Current (Io): 2.6A @ 20V
Continuous Current: 62A
Maximum Burst Current: 75A
Cells: 4S-6S Li-Po
Speed Control: 80A
Weight: 5.70 oz (162g)
Overall Diameter: 1.10 in (28.0mm)
Shaft Diameter: 0.20 in (5.0mm)
Overall Length: 2.00 in (52.0mm)

So, my question is has anybody run one of these in a plane like this....or even thought about doing it ?? I actually have one in a Habu 32 EDF and it certainly handles the power that they say it will, the bearings seem good, it is pretty reasonably priced for this type of motor etc etc.

Jag
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Old Jan 29, 2013, 03:41 PM
Lloyd Robinson
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USA, MO, St Louis
Joined Jun 2007
780 Posts
If efficiency is what you are after than I wouldn't be considering an Eflite motor. I could be wrong but you just don't see much discussion of those motors in high power applications. Check out the Mega 16/30/2 which is about the same size and Kv and can likely handle a lot more power than that Eflite motor. Just my $0.02.
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Old Feb 06, 2013, 04:34 PM
Crashing into the sky!
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Auckland NZ
Joined Aug 2007
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Quote:
Originally Posted by Arcteryxxx View Post
Would be nice if everyone who has got a setup to recommend posted the specs and backed it up with a video...

Geared drive:
Got a 4400kv Scorpion (HKII 2221-6) mated with a KPG25 5.2 gearbox. Oh man that motor can deliver!.....
Do you have any 3S numbers for this setup?

Im thinking of putting my wasp of a diet, go back to a 3S 1800 setup. The 6s setup is fast as, but I really dont think thats what wasps are about Want to go back to a more flicky hyperactive (ie lightweight) setup.

Tempted to try a 2221-6 5.2:1 on 3S with the rfm 14.5x14s (trimmed to fit)
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Old Feb 06, 2013, 11:27 PM
Livin it UP when Im goin DOWN
Arcteryxxx's Avatar
Norway, Telemark, Skien
Joined Feb 2010
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I can rig a test for you, if you give me a couple of days. eCalc seems to be pretty accurate with the Scorps, so check it out for some pointers.
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Old Feb 07, 2013, 04:57 AM
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Mreyello's Avatar
Deutschland, RP, Niederzissen
Joined Dec 2011
849 Posts
Datas from Andy Reisenauers HP:

3s - 11V - 14,5x14, 7200 rpm,114 Amp.1255 Watt, Schub 5026g, Eta 69,0% max. 5-8 Sek.

This is with 5:1 GB,you will get some lower numbers due to the slighly different gearboxratio.

Eta is a bit low static but will rise when Motor unloads.
If you dont have the KPG in your shelf, maybe the Reisenauer ME NL 5:1 could be an option, you could save another 35-40g, which is almost the weight of 1cell!

Yello
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Last edited by Mreyello; Feb 07, 2013 at 09:41 AM.
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Old Feb 07, 2013, 08:07 AM
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miche's Avatar
Joined Oct 2008
473 Posts
Scorpion 4400kv HKII 2221-6, Reisenauer 5:1 GB, lipo Rhino 3S 1850mah 40C

Static test: @ 1250 meters ASL

- GM prop 9x21.5, current:50amp, rotational vel.: 8125rpm

- AJ AeroModel Prop 10x19, current: 70amp, rotational vel.: 7400rpm


Quote:
Originally Posted by jackosmeister View Post
Do you have any 3S numbers for this setup?

Im thinking of putting my wasp of a diet, go back to a 3S 1800 setup. The 6s setup is fast as, but I really dont think thats what wasps are about Want to go back to a more flicky hyperactive (ie lightweight) setup.

Tempted to try a 2221-6 5.2:1 on 3S with the rfm 14.5x14s (trimmed to fit)
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Old Feb 07, 2013, 03:03 PM
Livin it UP when Im goin DOWN
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Norway, Telemark, Skien
Joined Feb 2010
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My sporting setup is with the 2221-6, KPG5.2, 4S1800 and RFM 10x17. About 100A and 1400W turning the prop at 10400rpm. I use the RFM 12x17 to get real hot and it draws about 135A on 4S.

Graph of the 10x17:
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Old Feb 07, 2013, 05:00 PM
Crashing into the sky!
jackosmeister's Avatar
Auckland NZ
Joined Aug 2007
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Cheers guys.

Am looking in the bits box, have unused kpg25 4.2 here. A Reisenauer would be cool though (really need to try one of those things )

69% eta is pretty heavily loaded.


Maybe I should go lighter. Reisenauer 5.1, 2213-14, that would be ~800W and 60+ grams lighter than a 2221/KPG setup. Lower performance than the bigger motor, but 800W is still going to heaps of fun in a wasp.


Hmmmm
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Old Feb 08, 2013, 02:42 AM
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Mreyello's Avatar
Deutschland, RP, Niederzissen
Joined Dec 2011
849 Posts
Jacko,
If you think about new motor and new gearbox you may also have a look at those Peggy Peppers 2221-with higher KV:
http://www.reisenauer.de/artikeldeta...1525&sprache=2
I also would prefer a 12x17 RFM, at light planes it would give a much better climbrate than the 14,5x14

Yello
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Old Feb 08, 2013, 04:11 AM
Livin it UP when Im goin DOWN
Arcteryxxx's Avatar
Norway, Telemark, Skien
Joined Feb 2010
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Quote:
Originally Posted by jackosmeister View Post
Cheers guys.

Am looking in the bits box, have unused kpg25 4.2 here. A Reisenauer would be cool though (really need to try one of those things )

69% eta is pretty heavily loaded.


Maybe I should go lighter. Reisenauer 5.1, 2213-14, that would be ~800W and 60+ grams lighter than a 2221/KPG setup. Lower performance than the bigger motor, but 800W is still going to heaps of fun in a wasp.


Hmmmm
I wouldn't build it too light either, as the plane is not the most streamlined in the world and looses speed rapidly while gliding. My setup is 990g and I would not have it any lighter than that because of the speed retention issues.
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Old Feb 09, 2013, 06:04 AM
Youtube: TomRi25
Dr.Tom's Avatar
Croatia, City of Zagreb, Zagreb
Joined Aug 2010
693 Posts
is 50mm from LE correct CG for HobbyKing Reverb ?

Thanks

my build is slowly coming to an end...
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Last edited by Dr.Tom; Feb 09, 2013 at 02:56 PM.
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Old Feb 09, 2013, 03:43 PM
Lloyd Robinson
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USA, MO, St Louis
Joined Jun 2007
780 Posts
Looking good! The range seems to be from 50 - 55 mm. I'm at 52 and like it.

Quote:
Originally Posted by Dr.Tom View Post
is 50mm from LE correct CG for HobbyKing Reverb ?

Thanks

my build is slowly coming to an end...
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Old Feb 09, 2013, 04:15 PM
Livin it UP when Im goin DOWN
Arcteryxxx's Avatar
Norway, Telemark, Skien
Joined Feb 2010
4,261 Posts
Nice, Tom! Hope you can report about how those Tgy servos work for you.
I suggest you apply some bright color to the top of the wing. Vinyl tape, paint or whatever doesn't matter, but unless you have the eyes of a Hawk(intentional) you gonna need some bright colors to make the visuals better for orientation.
Maybe it's the old man flying for too long in the snow syndrome, but hey! The all white wing gets lost flying inverted in a cloudy sky. I'm sure you don't want that....
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Old Feb 09, 2013, 10:17 PM
200mph +
sykotic's Avatar
New Zealand, Manawatu-Wanganui, Palmerston North
Joined Sep 2010
930 Posts
Looks good.

Not sure how much (if you have at all) spolierions set up for landing, but you want them 2 or 3 times more up alieron than you are showing in that picture if possible. Helps slow it right down without being unstable at all.

Will fly fine without of course, just means a longer landing run.

+1 on interested to hear about those servos.
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Old Feb 09, 2013, 10:39 PM
Chillaxin dude!
BulletMaster's Avatar
Newcastle, NSW, Australia
Joined Apr 2003
4,786 Posts
Flew the Reverb fitted with Dr MadThrust 2200KV motor and DUP's 4.75 x 6.2 folder today... 5S 1800 Zippy lipo

Section of the graph from the flight:
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