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Other › Serious Problem with Neu 1521 Motor
01-14-2009 11:54 PM  9 years agoPost 21
sneu

rrApprentice

San Diego

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As I said that is the shaft that has been used since June of last year. There is a earlier version shaft that is different from that drawing and is is no longer used.

Steve Neu

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01-14-2009 11:59 PM  9 years agoPost 22
specialtydevice

rrVeteran

New Rochelle , ny- USA

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likei said, check tomorrow for a picture of the shaft thats much deeper cut than that picture, I bought both motors from Amainhobbies.com, does that ring a bell? And why am i being charged for the repairs

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01-15-2009 12:25 AM  9 years agoPost 23
specialtydevice

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New Rochelle , ny- USA

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charged $55 to repair the broken shaft. Thats half the price of a Scorpion 10s motor that i bought as a replacement.

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01-15-2009 12:28 AM  9 years agoPost 24
specialtydevice

rrVeteran

New Rochelle , ny- USA

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and why does the 1515 shaft not break? Nor does the 1915 shaft break either? Thats because you guys dont notch the shaft on these motors.

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01-15-2009 12:38 AM  9 years agoPost 25
Quandumphone

rrApprentice

Yuma, AZ

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My 1515 shaft is notched and I have had very good dealings with NEU.

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01-15-2009 01:06 AM  9 years agoPost 26
sneu

rrApprentice

San Diego

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"and why does the 1515 shaft not break? Nor does the 1915 shaft break either? Thats because you guys dont notch the shaft on these motors."

Hard to know why given the fact that the shafts are common to the different size motors--just cut to different lengths. Keep in mind that with the larger motors like the 1521 you can have very large side loads given the fact that the motor can produce upwards of 4-5 hp when doing hard 3D. You have to transfer all that power through a 5mm shaft that usually does not have any support beyond that the motor bearing gives it. It would help if the helicopter had a support for the shaft past the pinion gear--a few do and don't have this problem. A larger shaft can help--but that limits pinion gear choices. We will work to improve things but i think that there is no magic that will fix the problem. We build a more powerful stronger motor then people push them even harder and find new ways to break things

Steve Neu

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01-15-2009 04:08 PM  9 years agoPost 27
specialtydevice

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New Rochelle , ny- USA

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i just received my 1521 motor repair today and the shaft, after i explained on the work order that the original one was shaved 1/3 of the way in, came preshaved exactly what Mr Neus drawing detailed. AND I WAS CHARGED $80 FOR THE REPAIR!!!. the shaft is a little long and needs to be shortened, like on the 1515 and the 1915 whick is no problem. Why is the shaft different than the 2 original ones i purchased and why did i get charged so much on a repair of a motor i spent nearly $300 for??? I bought the motors on http://www.amainhobbies.com. Was there a bad batch that was unloaded to them in which 3rd party shafts were used? Is there something Mr Neu is not telling us?? This new shaft looks like it was shaved in the shop by them as i can see the milling work done on the shaft as the other one looked like it was premade with the shaving 1/3 of the way. Was the original one made from weaker material? Looks like you did the milling work on this you selves inhouse. AND AS FAR AS IM CONCERNED ABOUT THE SECOND MOTOR WITH THE BROKEN SHAFT, I SENT IT IN AND YOU GUYS CAN KEEP IT! IM NOT PAYING ANOTHER $80 TO REPAIR A MOTOR I SPENT NEARLY $300 FOR THAT YOU GUYS FAIL TO ACKNOWLEDGE THE FLAW! I SEE THAT YOU GUYS DONT CARE ABOUT YOUR CUSTOMERS

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01-15-2009 05:30 PM  9 years agoPost 28
specialtydevice

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New Rochelle , ny- USA

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Response to Mr Neu
I just wanted to say thank you for showing a concern and posting responses to this issue. I see that you log on and go directly to this thread. In a consumer based business its always the customers that make a business and not every owner goes on here and posts responses. I still think your product is the best quality as opposed to other motors like Scorpion for instance. Its just that one particular motor, 1521, has a major flaw and the other models that i have used are outstanding and thats why i stick with Neu Motors

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01-15-2009 05:35 PM  9 years agoPost 29
specialtydevice

rrVeteran

New Rochelle , ny- USA

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Maybe you didnt know about the faulty shafts in the 1521s that were sold from amainhobbies but i think it to be unfair that i get charged $80 for the repair and i still am not paying for the second fix just for the simple reason of it being not right and ill eat the $265 cost of the motor rather than to pay another $80 as a matter of principal

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01-15-2009 05:46 PM  9 years agoPost 30
sneu

rrApprentice

San Diego

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We do try to be fair and reasonable with our customers and take care of problems. $80 to is a reasonable price for replacing the rotor and bearings. It usually takes about a hour of time to do the job and test it. We don't make money on repairs. The rotor is a costly item to make --there are quite a few steps in the process to assemble and balance. Is a hour of shop time plus a expensive rotor worth $80? We only try to recover our costs.

If you don't want the second motor fixed please send a e-mail to our repair department and they will return it to you or scrap it.

FYI the earlier shaft did not have a notch that was 1/3 of the way through. We changed the notch design at the request of the car customers that wanted to have the longer flat vs the earlier version where it was near the center of the exposed length.

Steve Neu

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01-15-2009 05:49 PM  9 years agoPost 31
specialtydevice

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New Rochelle , ny- USA

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and you spoke about there not being another shaft support on this heli setup and its true on the Trex 600E as opposed to the Estratus setup. But when designing a motor you must consider the application where your motors will be used and of course you are aware that the Align Trex is the best selling heli. The 1515 on the Trex setup with no shaft support above the pinion, the shaft never breaks as it is a different shaft that comes not shaved and extra long and i believe it is of a different material, which Ive used for nearly a year with no problems. only issue is the 4 minute flight time which was the reason i went to the 1521 on the Trex. Obviously there is a shaft problem on this motor as it lasts 2 weeks on 2 different 1521s until it breaks on mid flight.

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01-15-2009 05:56 PM  9 years agoPost 32
specialtydevice

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New Rochelle , ny- USA

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We do try to be fair and reasonable with our customers and take care of problems. $80 to is a reasonable price for replacing the rotor and bearings. It usually takes about a hour of time to do the job and test it. We don't make money on repairs. The rotor is a costly item to make --there are quite a few steps in the process to assemble and balance. Is a hour of shop time plus a expensive rotor worth $80? We only try to recover our costs.
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I understand there are costs to fix the motor, but whos fault is it? the consumer? You must be made aware of these issues as it is us, the customers, that are the ones who use the product and if a faulty shaft was used why is it us that bears the cost of the repair? Isnt it the manufacturer that used these 3rd party shafts in the first place and i i think it was done because it was cheaper to do? When Chevrolet had all those recalls on faulty cars wasnt it them that ate the costs of the repairs instead of hitting the customer?

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01-15-2009 06:27 PM  9 years agoPost 33
QueeQueg

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West Texas

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A 6mm sahft only eliminates the smallest pinions. For instance an 8t Module 1 is to small for a 6mm bore a 9t is available. It's also real hard on the plastic gear since only one tooth is in contact at a time.

A 6mm shaft is at least 20% stronger. problably more.

The side load is extreme as pointed out at 5HP.

I've seen and read about snapped shafts on a pretty much all motors so it's not just a Neu thing. Maybe the just have more power

I personlly snapped one on a Actro and it snapped right at the bearing below the flat.

80 bucks would have been cheap getting that one fixed.

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01-15-2009 07:23 PM  9 years agoPost 34
specialtydevice

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New Rochelle , ny- USA

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so why doesnt the 1515 motor with a 5mm shaft that doesnt come preshaved so deeply never snap??

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01-15-2009 07:31 PM  9 years agoPost 35
QueeQueg

rrVeteran

West Texas

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Yours may not have but they can and do. It also doesn't have as much torque as the 21

Ever see a 4HP Tecumseh with a 5mm shaft.

You've got a pinion thats trying it best to climb out of the main gear and all that force is going against the shaft.

I tried a 5mm shaft from scorpion to use a 5mm pinion I already had. It snapped on the first flight. I got a 6mm pinion and put the original shaft back with over a 100 flights on it.

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01-16-2009 12:17 AM  9 years agoPost 36
sneu

rrApprentice

San Diego

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Here are some pictures of what may well be the root cause of many problems with the shafts. We see this mostly in helicopters --it is called "fretting" and causes damage like you see in the pictures. actually common in high speed equipment with high loads. It is a form of corrosion and is difficult to control. Fretting can lead to small cracks which may cause the shaft to snap.

We are looking at ways to try and reduce this problem.

PHOTO]/fastphoto/27961/Shaft_Fretting.jpg[/PHOTO]

Steve Neu

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01-16-2009 01:44 AM  9 years agoPost 37
specialtydevice

rrVeteran

New Rochelle , ny- USA

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but is "fretting" possible in a motor no older than 2 weeks? Because both 1521s lasted that long at the most. The second one broke on the second day i took up the Trex 600E

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01-16-2009 02:54 AM  9 years agoPost 38
QueeQueg

rrVeteran

West Texas

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The scorpion i snapped the shaft on had that exact same symptom.

The Actro i snapped looked like a broken candy cane. It had many flights on it.

like is said earlier SD the 5mm scorpion did that about 3 minutes into it's first flight.

Thanks for the info Steve

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01-16-2009 03:30 AM  9 years agoPost 39
Ronald Thomas

rrMaster

Gainesville, Fl, USA

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How about a 6mm shaft?????? I seriously doubt ou would break one of those I don't know what Scorpion motor you bought (as you are yet to provide an exact model number) but if you have a 4035 series motor, I am sure it will NOT be a "dog" if you set it up properly. I have two scorpion motors, both with 6mm shafts, one in my Logo 600 (4035-630KV on 10s) and one in my Trex 700 (4035 500KV on 12s) Crazy power

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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01-16-2009 03:40 AM  9 years agoPost 40
QueeQueg

rrVeteran

West Texas

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yep scorpions are awesome

thats why they make you buy the 5mm shaft separate. because they know your going to snap it if you really 3d it.

It's the same with the bearings on all these heli motors. the stress their under is nutz. 20 to 30 grand rpms and 5hp. no wonder they break.

look at the size of these things on industrial motors. you wouldn't even get off the ground if the builders used indestructable parts

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