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Old Jan 18, 2003, 03:08 PM
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Fredrik W's Avatar
Stockholm, Sweden
Joined Jul 2002
1,249 Posts
The Giant Electric Motor Test <= Would you find this interesting??

Iīm currently making a lot of motortests with my motor test bench. With this homemade device, a tacho and a Astro Watt meter I can read; thrust, rpm, current, input watts and voltage. When the data is compiled pitch speed and a sort of efficiency (grams/watt) will be added to the table.

Together with a wardrobe door full of propellers, a drawer full of acku-packs and a box with gearboxes I have what I need to produce a big volume of motor test data.

I have made two production samples for you to view:

Mega, ACn 16/15/4

Model Motors, AXI 2814/12

Do you find this interesting? Is it wort the effort to publish tests like these on the Internet?
If that is the opinion I will make a department on my site dedicated to these motor tests.

The motors that I have tested, or are about to test, is these:

Mega 22/30/3

Mega 22/20/2
Mega 22/20/4

Mega 16/15/2
Mega 16/15/3
Mega 16/15/4
Mega 16/15/5
Mega 16/15/6
Mega 16/15/8

Mega 16/7/7
Mega 16/7/8
Mega 16/7/12

Model Motors, AXI 2814/10
Model Motors, AXI 2814/12
Model Motors, AXI 2820/10
Model Motors, AXI 2820/12

Model Motors, Mini AC 12/15/16
Model Motors, Mini AC 12/15/20

Jeti Phasor 15-3
Jeti Phasor 15-4

After that I will start looking at standard Ferite motors, such as

Speed 280
Speed 400
Speed 500-700

Almost every motor will be tested with one, or more, gearboxes.

This is only the first batch of motors, more motors and motor/prop/gearbox-combinations will be added to the Giant Electric Motor Test on a montly basis.

Hacker, Kontronik and MP Jet motors will also be objects for future testing.

Please, reply to this thread and share your opinions with me!

// Fredrik Wergeland
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Old Jan 18, 2003, 03:40 PM
Registered User
Hopkins, MN
Joined Dec 2002
7 Posts
I, for one, would definately be interested in this. I'm looking to buy a brushless motor, and punching a variety of number through programs looking for the right motor/prop combination can be daunting!

See my post:

So, by looking at your data, I don't see a single prop being used on the Mega 16/15/4 using 8 cells, that looks like it pulls less than 14 amps, too much for my 8 x 1800 NiMh AA cells!

Your chart alone probably just locked me in to the 16/15/5 instead, where I think my battery pack will be much happier.

Thanks for publishing that! (so when are you going to post the 16/15/5 data )

Yes, I think there would be an interest. Much better than the calculators, and much more usefull info then what I was able to find on the mega motors website.

A.K.A. Joseph Warren
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Old Jan 18, 2003, 03:44 PM
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buzzsaw 46's Avatar
Spring Valley. MN
Joined Jun 2000
4,458 Posts
If you are willing to put the time into these tests I would love to have access to them. for the brushless motors you should also list which ESC wass used since there are differances in the advance from one to the next. Thank you for offering this service to all of us
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Old Jan 18, 2003, 05:13 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
21,479 Posts
Good Job, I would be very interested in the data.
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Old Jan 18, 2003, 06:53 PM
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Joined Feb 2001
4,021 Posts
Me too,thanks for your time and effort in gathering the data,bring it on!
Much appreciated.

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Old Jan 18, 2003, 11:16 PM
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Clayton's Avatar
Jackson Hole, Wyoming
Joined Feb 2001
574 Posts
Tossen Tack!
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Old Jan 19, 2003, 10:26 AM
Supersonic Engineering
GordonTarling's Avatar
UK, Greater London, Uxbridge
Joined Mar 2001
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Very useful information! I don't know how you find the time!
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Old Jan 19, 2003, 10:55 AM
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Ben74's Avatar
San Francisco, CA, USA
Joined Jun 2001
2,811 Posts
wow, you have a lot of motors! i'm sure everyone would be interested in seeing your data. it's better than motocalc!
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Old Jan 19, 2003, 11:08 AM
Registered User
Canada, BC, Kelowna
Joined Nov 1999
920 Posts
I would be very interested in your tests.
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Old Jan 19, 2003, 11:56 AM
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Bandikoi's Avatar
United States, FL, West Palm Beach
Joined Jul 2002
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Very good looking and useful charts. Thanks for your time in compiling and posting.
I would like to see more and thanks in advance.

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Old Jan 19, 2003, 04:46 PM
Registered User
Santa Rosa, Northern CA, USA
Joined Oct 1999
2,472 Posts
Hello Fredrik,

Very nice! I am sure that your charts will be valued by many of us.

Have you thought much about the order of the data? I suggest Cells, Effect(Watts), Volts, Current, RPM, Thrust, Pitch speed, Efficiency. You may want to arrange one set of data and see if this makes sense to you.

Happy Landings,

PS: Does any one else agree or am I just used to a certain format?
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Old Jan 20, 2003, 01:08 AM
SAM Elec GrdChmp04,07,10,12,14
Jay Burkart's Avatar
Smithfield, Ky.
Joined Sep 2001
1,094 Posts
Super data


This is an outstanding effort. Great work and a super contribution to E flyers.

As others have sent the formating and easy accesibilityof the data is very important.
Perhaps accessing through some kind of spread sheet access would be useful then searches could be done for not only one particular motor but also comparisons could be possible.

Thanks for a fantastic potential tool.

Jay Burkart
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Old Jan 20, 2003, 04:27 PM
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Fredrik W's Avatar
Stockholm, Sweden
Joined Jul 2002
1,249 Posts
Thanks everyone!

Thanks everyone for you comments and opinions!

The Great Electric Motor Test will go on-line the first week in february, if nothing unexpected happens.

Zwierdo = > I will send a private message to you tomorrow evening.

Buzzsaw => Yes, you are right, the ESC could give about 10% difference on the tests.

hoppy and bipeflyer => There will be plenty of it. Stay tuned!

Clayton => Itīs "Tusen Tack!"

GordonTarling => Yes it sure takes time, on motor- and gearbox combination takes about 1 h 15 min to test, then there is another 20 min to get the numbers in to the computer... BTW. You sell brushless motors, donīt you? Hmmm. I think I will have to get back to you...

Ben74 => I donīown all these motors, (wish I did) but many of them. I have borrowed from friends, and from my local suppliers. Motocalc can deviate alot! Live tests, that is what counts!

Rod and Bandikoi => Thank you for the comments, very appreciated.

Daveairway => That was very interesting! I have arranged the data in the order that I valued them: Thrust greatest interest, placed first, Volts of smallest interest, placed at the end. But maybe I should reconsider that! More opinions whanted here!!!

Jay Burkart => I will use frames on my site for easy navigation from one motor to another. And the Print-button in the upper right corner on each page makes it easy to print your own copy of the table. I dont know Java, PHP, ASP and all other fancy web-building languages. So I canīt make a fancy glancy interactive click here and there site with on-line comparsions of data-tables that the visitor can choose from - but I wish I did!!! Another thing that I wil add is ofcourse information about wich cell Iīm using, brand, type and size. That makes to a lot of difference.

Thank you again everybode for taking time and sharing your opinions with me - and keep īem comming!!!

// Fredrik Wergeland
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Old Jan 20, 2003, 04:43 PM
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KillerAir's Avatar
Stratford Sikorsky, Connecticut, United States
Joined Dec 2001
6,715 Posts
Fredrick, This would be excellent info to have on hand.Threads get lost or forgotten about and with so many asking the same questions over and over it would be great to send them to a library to look up. especially the thrust and rpm's data.

Do you also plan on different cell pack make ups in the data?
This would also prove very valuable.

Great job

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Old Jan 20, 2003, 08:43 PM
Registered User
Hamilton, New Zealand
Joined Nov 2002
266 Posts
Well done Fredrick, this is exactly the kind of accurate physical testing we need. You've chosen the ideal range of props for your tests.

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