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12-11-2004 05:16 AM  13 years agoPost 1
DaBman

rrApprentice

San Diego, Ca.

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Hey Gang, I've been flying my Zoom with a Park 400 4200kv for almost a year now. I was flying tonight with no problem with the exception of low flight times(actually low flight times lately). I went inside to change packs and went back out and when I went to lift off, nothing but a little gear noise. Upon inspection, my whole assembly was seized. I removed the motor and tried running it but only get a little "flutter" and My ESC gets warm very quick. Two questions, One, I'm assuming a gradually failing motor is affecting my flight times and is heating up my packs really bad and two, now that I have to buy a new motor what would you reccomend? My LHS carries Parks and Outrunners. I was very happy with the Park but should I try an Outrunner instead? Please advise. Thanks!

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12-11-2004 06:59 AM  13 years agoPost 2
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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If you have anything else with a brushless controller in it or a buddy with one, try running your motor on it. Keep the first try VERY short, like a second or two, if your Park is fried, then you don't want to risk a different ESC. If it runs on the other ESC, well you know and get the picture.

If you don't have access to a different ESC, then I would guess it is your motor or at least the bearings in it. Can you turn the motor shaft by hand? If not then the bearings are probably trash. If it is not the bearings, then I would think that after almost a year of flying that one of the windings in the motor has given up due to time and heat. If a winding is broke, then the motor will flutter. The flutter is due to the magnetic field not being complete and can't start the motor spinning.

As for the Park 400, I think it is the best 4200Kv for 3 cells out there. I'm not saying the Outrunner is bad or anything. I'm flying a Park 400 and love it! I use my Hacker, Himax motors to make my flight box alittle heavier since I put the P400 in.

BUT, I have not tried the Outrunner!

Don't come off the throttle untill you see your GOD!

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12-11-2004 07:32 AM  13 years agoPost 3
DaBman

rrApprentice

San Diego, Ca.

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Thanks for your reply Blake, I did indeed try turning the motor by hand and it is definately seized. If i can turn it at all, I get a very rough revulotion with a little grit and black crap. Hell, I may just buy another Park, did good buy me and I ran alot of juice and flight time through her.
I don't want to go through all the BS of researching a different motor when, the type I was using worked for me for quite awhile. When I first went brushless I was under the assumption that a brushless motor could not possibly fail. But, as with anything else, there is a life expectatcy. Thanks again!

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12-11-2004 04:11 PM  13 years agoPost 4
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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Me and my buddy have tried and researched about all of the except for the Outrunners. It seems that the Park 400 is about as good as they get for 3 cells. Strange the the cheapest motor is kicking the high dollar motors rear ends. The only thing we have found that is as good is the Chili Pepper, but it is twice the money. Go figure?

Don't come off the throttle untill you see your GOD!

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12-11-2004 07:17 PM  13 years agoPost 5
iron_xl

rrApprentice

Wisconsin

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"I did indeed try turning the motor by hand and it is definately seized. If i can turn it at all, I get a very rough revulotion with a little grit and black crap".
Sounds like you have a shattered magnet.

GRAVITY SUCKS!

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12-12-2004 02:25 AM  13 years agoPost 6
DaBman

rrApprentice

San Diego, Ca.

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Hey Iron, shattered magnet? How could have this happened? I've never dropped the motor. The only thing I could think of that might have shattered the magnet is, because this motor ran super hot(for reasons unknown), I would invert a can of liquid air and spray super cooled liquid on the motor to cool it between flights. Perhaps this fractured the mags over time and the finally went to pieces. It was very abrupt, flying on moment and then on the next pack not even a rotor turn. Could explain the dwindling flight times and batteries getting hotter and hotter.
Your thoughts on this anyone?

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12-12-2004 04:29 AM  13 years agoPost 7
vinrx7

rrVeteran

Americas finest city

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thats exactly what it was like when my brushed motors buned up. Turning the motor by hand was like turning one of those pepper grinders.

STUPID TREE!!!

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12-12-2004 04:48 AM  13 years agoPost 8
turboomni

rrProfessor

East of the Equator

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Do Park 400's get hot? Do they need a heatsink?
Just curious

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12-12-2004 02:17 PM  13 years agoPost 9
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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the Park is about like most of the 400 speed motors and run in the low to mid 100's, so a heatsink will always help.

Don't come off the throttle untill you see your GOD!

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12-13-2004 12:37 AM  13 years agoPost 10
turboomni

rrProfessor

East of the Equator

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Outrunners
A great out runner is the Justgofly 400DH.
KV is 4400. It barely gets warm and is very powerful.
I run this motor and it's just great with many hours on it.

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