I need advice for the right Outrunner on a new 3D plane... - RC Groups
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Nov 25, 2005, 06:00 PM
Wind is the devil.
Argyle's Avatar

I need advice for the right Outrunner on a new 3D plane...

I must admit, I am new, and I am still learning about static thrust vs pitch speed.

I have also never owned an outrunner motor.

The plane I want to put the motor on is a Wild Fly 3D Bipe from Hobby People.

The recommended AUW weight with a 2c 1300mah Lipo is 12ish-14 oz.

I have been looking at the BP21 and the BP9Y, but I cant figure out how they differ aside from prop size (which I assume is linked to the weight of the motors moving parts).

I am obviously attracted to the BP brushless motors because of the price, but I would be willing to spend more for a higher quality product (like a more efficient motor).

Ideally, I want to run on 2c lipos, as I have a few in the 900-1300mah range, and dont want to invest in yet another set of lipos. It seems that the power required for my plane would be a bit anemic with a BP21 and 2c lipo.

Is there an Outrunner that can produce the thrust I need on 2c lipo?

Bear in mind this is my first 3D plane, so the power just needs to be "enough" not insane. If I upgrade to 3c lipo, I can get that performance increase when the time is right.
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Nov 25, 2005, 06:32 PM
Registered User
manuel v's Avatar
Komodo motor KH-278-v2 is a good option.


if you wind a 18T.

APC 11 x 4.7 8.16A 4400 rev 16.6 OZ.

a 17T.
Apc 11 x 4.7 9.A 4500 revs.
Data with old version. KOmodo 278 v1.

Nov 25, 2005, 07:11 PM
Wind is the devil.
Argyle's Avatar
I am a bit intimidated by "build-your-own" brushless motors.

Also, when looking at that chart, I didnt see the performance you listed at 7.4v 2c lipo level.
Last edited by Argyle; Nov 25, 2005 at 07:26 PM.
Nov 25, 2005, 07:23 PM
Registered User
MorrisM's Avatar
Take a look at the AXI 2212/26 with APC10x4.7 on the great motor test. You shoud get 18-20oz thrust on 2S lipo's if the data is accurate.


PS: That plane looks nice... easy to build and very good price.
Nov 25, 2005, 07:34 PM
Wind is the devil.
Argyle's Avatar
That's some good info. The motor you listed looks nice. Heck of alot more expensive than a BP21 though.

How much thrust will I need for 3D moves? 1.25 : 1 ratio of thrust to weight?

I think I need to use the bare minimum thrust, combined with the best pitch speed, so I can fly in some wind. (Wind > Cincinnati)
Last edited by Argyle; Nov 25, 2005 at 07:41 PM.
Nov 25, 2005, 07:48 PM
Registered User
MorrisM's Avatar
2:1 would be better for wild 3d. You might get close with a bigger prop on the Axi, or go with 3S lipo. Another motor that might work is the Hacker A20-22L. Dr Kiwi did some tests on the Hacker, you might find the info if you do a search.
Nov 25, 2005, 07:49 PM
Registered User
manuel v's Avatar

this numbers is personal data.
post here.


rewind this motor are ease,

one DIY motor not is One Motor.
you only rewind with diferent turn and you have other motor.

Last edited by manuel v; Nov 25, 2005 at 11:18 PM.
Nov 25, 2005, 08:01 PM
Registered User
MorrisM's Avatar
The Komodo is a nice motor. If you want to try to Wind your own, it is not too hard. This person had good results.

Last edited by MorrisM; Nov 25, 2005 at 08:13 PM. Reason: typo
Nov 25, 2005, 08:19 PM
Wind is the devil.
Argyle's Avatar
I saw in a thread that it was difficult to wind over an 17T on this motor.

The guy in the last link said he couldnt get over 15T.

I have never wound a motor, will I have a good chance of success?
Nov 25, 2005, 08:24 PM
Wind is the devil.
Argyle's Avatar
BTW Morris, I am glad someone else had a positive opinion of the Wild Fly. I liked it for the exact reasons you mentioned.

For the price, I can destroy a couple learning and not cry myself to sleep at night.
Nov 25, 2005, 08:45 PM
Registered User
MorrisM's Avatar
I have the older komodo, not the V2. Same stator though. I found it easy to get 17 turns. Those that get 21 turns have my respect. 15 turns is a good goal for this motor for the first try.

I have been looking at other options too. The nippy 1812/100 is a step up in power from the Axi. On sale at hobby-lobby too.

I have one of these, but have not run it yet. I plan to put it in a 18oz 3D plane. 35oz thrust on 3S according the the great motor test. You should get 25oz thrust on 2S.

So many motors, not even Dr Kiwi can test them all.

Nov 25, 2005, 08:54 PM
Registered User
manuel v's Avatar

you need only one kit for learn.
even 12t. (very very easy) is OK. for you plane.
low count in wind is for 2 c. 7.4v. with 12 , 13 turn you need 8-9 inch propel.
and 13-15 oz. thrust.

anybody start in zero.
maybe in ebay this motor sales for 34 dlls. complete.

Nov 25, 2005, 10:57 PM
Wind is the devil.
Argyle's Avatar

The thrust data on the Nippy 1812/100 is awesome. Seems like it would give me an extremely wide range of flexibility.

Would that motor require more than the 1300 mah than I had planned? Seems to be the perfect fit, and a nice balance in price between the BP21 and the AXI.

Plus, I can put 3c on it, and turn it into a barn burner (probably rip the poor Wild Fly in half, maybe a small pylon could be the successor eventually!)


I will get one of these motors as my first DIY, but not right now, I am just not confident enough to do one (need to learn more, only been doing RC for about 3 months, and I have ALOT to figure out).

You guys are awesome, I really appreciate the help, and I am happy to have access to graphs for motor information, as the Excel sheet that everyone uses is way over my head at this point.
Nov 26, 2005, 12:16 AM
I have no friends
Take a look at Hobby Lobby's site for the Raven airplane videos. You can find them here:


It is flying on the Nippy 1812/100 in the video at 20oz and a 3s 2100 pack and flys awesome.

I have been looking at that motor for a House of Balsa Chea-Pass I have running on 8 NiMh cells, should be great.
Nov 26, 2005, 05:52 AM
Registered User
MorrisM's Avatar
Hobby Lobby rates the 1812/100 at 18A. That would be a bit much for the 1300mA lipo exept in very short bursts. I would try a 10x4.7 prop first.That should be ok for your 2S1300 if it rated at least 10C. If 20+oz thrust isn't enough, try a bigger prop and use throttle management. There aren't many motors that will give you 20+oz from a 2S 1300 lipo. The axi and nippy are both very efficient motors. Both are more than reccomended for the Wild Fly(HP has the manual on line).

If you don't have a wattmeter or amp meter, you should get one. It can help prevent damage to your power system. I have the Sears clamp on meter for field use. I have the Watts Up meter for motor testing at home.

Good luck with your project

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