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Old Jun 08, 2011, 01:16 PM
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Originally Posted by GGoodrum View Post
Actually, they have it exactly backwards. It is always better to have the battery leads as short as possible, and add length to the motor wires, if need be. In fact, with most ESCs, if you have to extend the stock battery leads at all, you should add caps, to the ESC end.

This became readily apparent to me about 4-5 years ago, when I was helping a guy do an RC-controlled blimp. This thing was fairly large (the bag was 20 feet long...), and had four motors that were spaced 6-8 feet apart. Initially, we had the ESCs co-located with the motors, and ran long battery wires back to the packs. This never worked, and we ended up frying several controllers. Finally, we tried moving the ESCs close to the packs, and ran 6-foot wires out to the motors and the problems went away.

-- Gary
Thats probably why I fried the one ESC.
Thanks
Rob
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Old Jun 08, 2011, 01:23 PM
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Ironbridge (UK)
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Originally Posted by robone View Post
Thats probably why I fried the one ESC.
Thanks
Rob
I dont think so imho
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Old Jun 08, 2011, 01:23 PM
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Originally Posted by zirt57 View Post
Where did you get the price list? Please post!

- Jeff
I'll email it to you as I'm not sure they want it out just yet. You can PM me
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Old Jun 08, 2011, 01:27 PM
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Quote:
Originally Posted by GGoodrum View Post
Actually, they have it exactly backwards. It is always better to have the battery leads as short as possible, and add length to the motor wires, if need be. In fact, with most ESCs, if you have to extend the stock battery leads at all, you should add caps, to the ESC end.

This became readily apparent to me about 4-5 years ago, when I was helping a guy do an RC-controlled blimp. This thing was fairly large (the bag was 20 feet long...), and had four motors that were spaced 6-8 feet apart. Initially, we had the ESCs co-located with the motors, and ran long battery wires back to the packs. This never worked, and we ended up frying several controllers. Finally, we tried moving the ESCs close to the packs, and ran 6-foot wires out to the motors and the problems went away.

-- Gary
+1 On this

Battery wires as short as possible, but ok to extend motor wires. I had this very same thing a few years ago for my EDF's where the ducted fan motor is at the back and the batteries are at the front.
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Old Jun 08, 2011, 01:28 PM
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Originally Posted by zirt57 View Post
XAircraft X450 ESCs.

- Jeff
Jeff

If I used the TURNIGY Plush 18amp Speed Controller orHobbyking SS Series 18-20A ESC , would that be okay. Its a lot cheaper. $12 vs $23

Rob
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Old Jun 08, 2011, 01:34 PM
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Old Jun 08, 2011, 01:41 PM
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For multi-copter use, I don't think we'll come near the 30" battery lead length. Even the 16" motor lead would be hard to exceed in most cases. For my hex, I think I'll just measure things out and extended whichever set of leads is the simpliest. Either way I won't exceed either length. So...what's the cell limit of the XAircraft ESCs?
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Old Jun 08, 2011, 01:47 PM
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Originally Posted by zirt57 View Post
You should be able to. You will have to program it so I would suggest getting the programming card (a lot easier). There are some settings you will have to do in the XAircraft configuration for the FC. Check the first page of this thread as Jingchen posted a link to how to do this.

- Jeff
I saw that, but does that only apply if you are using another ESC and the X650 motors?

Just checked and the "Output 1- 4 change to 3-4ms" is not possible now. So (not having done this before) I assume that this could be changed in the programming card, if required or maybe not necessary because different motor?

Rob
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Old Jun 08, 2011, 01:54 PM
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Old Jun 08, 2011, 02:25 PM
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Well, I can't replicate the problem I had with the motor so I'm going to pretend it never happened ;-)

Nick
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Old Jun 08, 2011, 02:37 PM
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Originally Posted by zirt57 View Post
It applies to ESCs other than XAircrafts. You should still be able to use X650 motors or even aftermarket motors. I haven't used different ESCs myself but others here have.

- Jeff
This is my proposed setup for the X650 X8:
All costs ignoring postage etc.

8xDT700 motors - $88
8xTURNIGY Plush 18amp Speed Controller - $95
Total Cost $183
Larger thrust per motor (or am I wrong)

or

4xX650 motors - $132
5xX450 ESC - $115
Total Cost - $247
I already have the other parts.

Sounds like a no brainer to me. Saving in my money = 30 cups of coffee at Starbucks. Problem....Just to get the FC to talk to the Turnigy ESC's.

So, needing help....what changes have to be made to the settings:
1. ESC start Throttle should be changed to over 1000us?
2. Anything else

Rob
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Old Jun 08, 2011, 02:49 PM
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Originally Posted by topgearuk View Post
+1 On this

Battery wires as short as possible, but ok to extend motor wires. I had this very same thing a few years ago for my EDF's where the ducted fan motor is at the back and the batteries are at the front.
So the positioning of the ESC on the X450 is wrong. The ESC should be mounted on the plates? and near the battery.

Does it really make that a big difference?
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Old Jun 08, 2011, 02:50 PM
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Quote:
Originally Posted by robone View Post
This is my proposed setup for the X650 X8:
All costs ignoring postage etc.

8xDT700 motors - $88
8xTURNIGY Plush 18amp Speed Controller - $95
Total Cost $183
Larger thrust per motor (or am I wrong)

or

4xX650 motors - $132
5xX450 ESC - $115
Total Cost - $247
I already have the other parts.

Sounds like a no brainer to me. Saving in my money = 30 cups of coffee at Starbucks. Problem....Just to get the FC to talk to the Turnigy ESC's.

So, needing help....what changes have to be made to the settings:
1. ESC start Throttle should be changed to over 1000us?
2. Anything else

Rob
Rob give andy (sid3ways) a shout he has similar problems to get the motors running with the HK Blueserries ESC. maybe he can help

edit
Changed the esc start timing canot tell you the values as i dont have a usb cable to hook up and and look now.
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Old Jun 08, 2011, 03:06 PM
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Just did some tests, so for those interested

x8
8x x650 motors
2 x x650 esc boards
mkTR camera mount
OSD and video downlink
Canon t2i w/16mm zenitar lens
AUW 3600 grams

at 50% throttle pulling about 20 amps for each side. Top motors pulling 20, bottom motors pulling 20. This is about the same as when I was running it as an x4 at about 1800 grams (obviously only 4 motors pulling 20 amps)

Cheers,

nick
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Old Jun 08, 2011, 03:10 PM
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