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Old Mar 27, 2005, 11:01 AM
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BEaumont Texas
Joined Sep 2004
105 Posts
Tango 45-8 with magnet thrown?

Test hovering my Hawk Sport E-conversion in pod and boom congiuration before final fitment into the 222 Fuselage..Running it with a 6S3P lipo and a Jazz 55-10-32 esc @ 80% . Picked it up into a hover and then set it down to adjust the gyro subtrim, spooled it back up and just when it ramped up to stable RPM ...POW!I thought my tail torque tube snapped or something because the tail blades came to a stop and folded them up.. When the mains spun down I tried to turn the rotor head by hand and it was bound.. Loosened the pinion and everything it free...Removed the motor and the shaft is locked up... I know some of the Tangos were notorious for throwing the magnets and I evidently got one...Good thing I was just spooling it up or this could have cost me a Heli....

Haldor, MotorMike>>>What do I do now????

Rick
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Old Mar 27, 2005, 12:37 PM
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Haldor's Avatar
Stavanger, Norway
Joined Feb 2000
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You send it in to Kontronik Germany, should be warranty repair regardless of age as you'd be at max 20k rpm - well within the rpm range of the older Tango. The newer Tango have ~30k rpm limit.

-Haldor
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Old Mar 27, 2005, 12:49 PM
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BEaumont Texas
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What is the address to send it to and what info do I need to include with it?

Rick
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Old Mar 27, 2005, 01:05 PM
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Stavanger, Norway
Joined Feb 2000
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Hi Rick.

Use:

KONTRONIK GmbH
Etzwiesenstraße 35/1
D-72108 Rottenburg-Hailfingen
Germany

Include details of your setup and contact info/return address.
Turnaround is within 48hrs after recieving the motor.
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Old Mar 27, 2005, 02:02 PM
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BEaumont Texas
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Good deal, will be boxed up and ready to ship tomorrow..

Rick
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Old Mar 28, 2005, 09:53 PM
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BEaumont Texas
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Tango is on it's way to Germany VIA Global Priority

Thanks,
Rick
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Old Apr 06, 2005, 05:24 PM
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NorCal Silicon Valley
Joined Aug 2002
11,778 Posts
uh oh!! I was going to ask a simple question till I saw this. My Tango 45-08 started cogging all of a sudden. I thought at forst maybe something got ingested into the huge holes in the back and stuck to the magnet causeing a slight gravity effect. i's not the bearings or anything either and everything else seems alright. I only spooled it up once in my 750 fan on 7S, but a funny magnet is starting to make sense. In the 40 second test I also kiled my Castle ESC, is it possible the mag cause alot of sudden resistance, or wold it simply fall off in power?


Barry
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Old Apr 07, 2005, 12:03 AM
X-Era Motors
DavidB.'s Avatar
Newport, NC
Joined Jan 2002
2,225 Posts
A dragging/jammed magnet would cause a huge increase in current. So that is prolly what fried the controller. If you wanna sell the tango real cheap, let me know
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Old Apr 07, 2005, 12:17 AM
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NorCal Silicon Valley
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lol dont blame you for trying! But I'll send it in and get it fixed then see if it holds, if it does it again I'll make you a deal! hehe But the more I think about it it makes sense, and i wasnt cranking the ESC more than I have in the past, and the run was very short. And the motor actually hesitated before the ESC thats what made me look to the light on the ESC, thats when it burned. Still cant be sure though

Barry
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Old Apr 07, 2005, 12:18 AM
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NorCal Silicon Valley
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And I take it these are not Kevlar or epoxy wrapped.


Barry
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Old Apr 07, 2005, 09:35 AM
X-Era Motors
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Newport, NC
Joined Jan 2002
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I would hope they are kevlar wrapped. Aveox used to use a very thin stainless steel tube to hold the magnets in, but kevlar row is by far the best.
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Old Apr 07, 2005, 09:59 AM
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United States, CA, San Diego
Joined Dec 1999
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Quote:
Originally Posted by DavidB.
I would hope they are kevlar wrapped. Aveox used to use a very thin stainless steel tube to hold the magnets in, but kevlar row is by far the best.
Unless they have changes lately the Tango is not Kevlar wrapped--the air gap is too little for much material.

FYI carbon is generally a better material for wrapping as it actually becomes tighter as it gets hot--also it has much better strength as it gets hot. The down side to carbon is that it is difficult to get in a small cross section that is easy to handle.

Steve
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Old Apr 07, 2005, 10:12 AM
X-Era Motors
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Newport, NC
Joined Jan 2002
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I would have thought carbon wouldn't have the toughness for this application, but I've been proven wrong. Also, I can't believe they would be worrying about that tiny difference in airgap. I kevlar wrapped one of my rotors, and it decreased the airgap distance by maybe .007in. With a standard motor I could see this causing a problem, but when the total airgap is multiple mm's, I would think the extra insurance would be worth it.
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Old Apr 08, 2005, 03:28 AM
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NorCal Silicon Valley
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didnt look like it was
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Old Apr 08, 2005, 03:44 AM
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Deutschland, Baden-Württemberg, Ebersbach an der Fils
Joined Dec 2001
922 Posts
I do not know one Tango of the newer series (3 years around now) which has thrown it's magnets. Kevlar wrapped is not necessary if you have the correct glue. We let them produce specially for the Tango. We have the limit at 30000 RPM for customers and enough reserve from the max. limit. The problem with the old glue was, that when it gets warm then cold and so on....the old glue is broken.
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