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Old Jun 08, 2009, 08:04 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
near Nijmegen, Netherlands
Joined Feb 2001
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Quote:
Originally Posted by NX-687
I have to ask , Why did you terminate Delta , when I have heard a rumor or read somewhere that star is better for torque ,
You can get identical motors with star and delta, by changing the number of winds by factor 1.8.
No circulating parasitical currents in star (due to slight differences in the phases and magnets).

Vriendelijke groeten Ron
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Last edited by Ron van Sommeren; Jun 09, 2009 at 05:48 AM.
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Old Jun 09, 2009, 03:18 AM
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Thanks Ron

FWIW I just did a small motor for a big prop and terminated Wye and I like its characteristics better than the delta , so far , flight testing further,, may prove otherwise but I dont think so

Its a 12 tooth, similar to the RW, I got effectively more turns on with thicker wire than the delta connection and with less parasytical currents like Ron has mentioned it feels good and strong , I will start some testing with equipment .,,,, its kind of interesting
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Old Jun 09, 2009, 04:21 AM
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Can this motor be used for a pusher wing? and with what kind of winding?
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Old Jun 09, 2009, 06:15 AM
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Yes

Quote:
Originally Posted by ed_khan
Can this motor be used for a pusher wing? and with what kind of winding?
See post No28 , Manuels comments on winds and prop

Runs great as pulling or pushing motor
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Old Jun 12, 2009, 10:58 AM
Dave North
timocharis's Avatar
USA, CA, San Jose
Joined Apr 2004
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Couple of interesting winds

Sometimes the overlarge (register?) bumps on the stators are mounted facing toward the can, which crowds the wires and creates a logical limit on how much you can safely pack in. I've been experimenting with various approaches and here's the latest:

Tgy 16T 26awg ABC Delta Kv 1882 Io = 0.73 Rm = 0.114
GWS 8040 DD Rhino 610 2S
9623 rpm @ 7.32v/9.93a
Badcock: 471 grams 16.6 oz/thrust 77.8% Efficient
DriveCalc: 518 grams 18.3 oz/thrust 80.6% Efficient
Not too shabby!

Then again, other times you don't have to deal with that kind of thing, so you can just keep going:

Tgy 21T 26g ABC Delta Kv 1435 Io = 0.61 Rm = 0.150
GWS 8040 Rhino 460 3S
10610 rpm @ 10.49v/9.10a
Badcock: 577 grams 20.4 oz/thrust 80.3% Efficient
DriveCalc: 636 grams 22.4 oz/thrust 82.5% Efficient
Woohoo!


Dave
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Old Jun 12, 2009, 05:50 PM
tree scavenger
USA, OH, Cincinnati
Joined Sep 2006
585 Posts
Tgy 21 turn

yeahh...Babie!

can i just bid on that now?
...knowin how ya hate that gawd-awful noise, and slightly diminished throttle finesse n all,,, it'd be my pleasure to relieve you of that burden Dave
say a buck a turn!? Shipped!?
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Old Jun 12, 2009, 06:04 PM
Dave North
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USA, CA, San Jose
Joined Apr 2004
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Uh uh. Nope. This one's special. It's gonna go for $1.1428571 per turn. Though I'm idly considering that it's worth even $1.1904761 per turn.

Dave
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Old Jun 14, 2009, 12:16 AM
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First class data

Quote:
Originally Posted by timocharis
Sometimes the overlarge (register?) bumps on the stators are mounted facing toward the can, which crowds the wires and creates a logical limit on how much you can safely pack in. I've been experimenting with various approaches and here's the latest:

Tgy 16T 26awg ABC Delta Kv 1882 Io = 0.73 Rm = 0.114
GWS 8040 DD Rhino 610 2S
9623 rpm @ 7.32v/9.93a
Badcock: 471 grams 16.6 oz/thrust 77.8% Efficient
DriveCalc: 518 grams 18.3 oz/thrust 80.6% Efficient
Not too shabby!

Then again, other times you don't have to deal with that kind of thing, so you can just keep going:

Tgy 21T 26g ABC Delta Kv 1435 Io = 0.61 Rm = 0.150
GWS 8040 Rhino 460 3S
10610 rpm @ 10.49v/9.10a
Badcock: 577 grams 20.4 oz/thrust 80.3% Efficient
DriveCalc: 636 grams 22.4 oz/thrust 82.5% Efficient
Woohoo!


Dave
It really takes this motor out of the slofly class and puts it into a power bracket , whatever that means ???

It means that this motor is now too powerful for slofly type models around 7 Ozs
And we need to trade power for weight and move down to the 19 grams type motors at HC to get amore floaty feel from the sloflys,
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Old Jun 14, 2009, 12:48 AM
Dave North
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USA, CA, San Jose
Joined Apr 2004
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Quote:
Originally Posted by NX-687
It means that this motor is now too powerful for slofly type models around 7 Ozs And we need to trade power for weight and move down to the 19 grams type motors at HC to get amore floaty feel from the sloflys,
Well, less power is easy to manage!

So far, my experiments with the 19-gram variants indicate they bog badly with an 8" prop. But if you dig the 7035, they can do a creditable job.


Dave
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Old Jun 18, 2009, 01:32 PM
I can fix that.
United States, PA, Mountain Top
Joined May 2006
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What would be the best wind to turn a GWS 9x4.7 on a 2S 350 or 2s 480 pack? Most of the winds I have seen are for 3S. I know the 1500Kv stock will turn it enough for a 5-6oz 3D foamy on those packs, but I would like to rewind it for the best efficiency. I am used to winding my own Customcdr motors, but since they are no more, I figure the rewound HC motors are the next best alternative.

Thanks,

-Ken
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Old Jun 18, 2009, 02:39 PM
Dave North
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USA, CA, San Jose
Joined Apr 2004
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Quote:
Originally Posted by solomonx
What would be the best wind to turn a GWS 9x4.7 on a 2S 350 or 2s 480 pack? Most of the winds I have seen are for 3S. I know the 1500Kv stock will turn it enough for a 5-6oz 3D foamy on those packs, but I would like to rewind it for the best efficiency.
Probably a 13-turn wye on dLRK or a 12-turn ABC. The 13-turn ABC was a little soft on the 9050. I'd probably go ABC on that quest due to the naturally lower Kv and resultant higher torque.
Quote:
I am used to winding my own Customcdr motors, but since they are no more, I figure the rewound HC motors are the next best alternative.
In my testing, these are not the next best alternative. They're better than the ccdr.


Dave
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Old Jun 18, 2009, 03:03 PM
I can fix that.
United States, PA, Mountain Top
Joined May 2006
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Quote:
Originally Posted by timocharis
Probably a 13-turn wye on dLRK or a 12-turn ABC. The 13-turn ABC was a little soft on the 9050. I'd probably go ABC on that quest due to the naturally lower Kv and resultant higher torque.In my testing, these are not the next best alternative. They're better than the ccdr.

Dave
Thanks Dave!

I'll try the 12T ABC and give that a shot as soon as my motors arrive. Better than ccdr is great!

-Ken
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Old Jun 22, 2009, 06:26 AM
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Dave

Quote:
Originally Posted by timocharis
Well, less power is easy to manage!

So far, my experiments with the 19-gram variants indicate they bog badly with an 8" prop. But if you dig the 7035, they can do a creditable job.


Dave
Speaking of 19 gram motors , Ive seen a video of a 3D Hobby shop guy with a 19 grammer with a 9x4.7 on and a 360 2S Rhino , and his yak is just spectacular, the indoor guys and others , will just use big props , because it gives a better close in flight and hover , a 7x3.5 would tend to give a puny hover , kind of screamy and bad
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Old Jun 22, 2009, 07:50 AM
I can fix that.
United States, PA, Mountain Top
Joined May 2006
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Quote:
Originally Posted by NX-687
Speaking of 19 gram motors , Ive seen a video of a 3D Hobby shop guy with a 19 grammer with a 9x4.7 on and a 360 2S Rhino , and his yak is just spectacular, the indoor guys and others , will just use big props , because it gives a better close in flight and hover , a 7x3.5 would tend to give a puny hover , kind of screamy and bad
Are you sure it is the 19 gram`r? I think the video was Ben flying. That setup is the reason I asked my questions and is the setup I want to duplicate. I do believe he is using the blue'n'red wonders with the 9x4.7 and 2s360 rhino. I asked about that setup and was told he was using 1500kv 2730 blue'n'red motor. I just wanted to rewind it with much thicker wire than stock.

-Ken
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Old Jun 23, 2009, 12:43 AM
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Hi

Quote:
Originally Posted by solomonx
Are you sure it is the 19 gram`r? I think the video was Ben flying. That setup is the reason I asked my questions and is the setup I want to duplicate. I do believe he is using the blue'n'red wonders with the 9x4.7 and 2s360 rhino. I asked about that setup and was told he was using 1500kv 2730 blue'n'red motor. I just wanted to rewind it with much thicker wire than stock.

-Ken
I spoke to Ben and he said that it was a Justgofly 2204
Thats amazing performance on a 9x4,7 ., but dont forget the model has to be hellishly light
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