Trouble with Neu 1521
 

I was setting the mesh today on my Neu 1521 when I realized the motor can was rotating. Basically the outside of the can with twist a little relative to the front plate. Should I be concerned?

I'm thinking I should......

Probably need to send her in......

It doesn't do this easily, its pretty snug.

If I'm not mistaken, Neu's have screwed on endbells. Simply tighten it down, and you should be fine.

ya they do.

im always worried mine will twist off but it hasnt yet.

I thought the front end bell and the rest of the can were one piece, on the 1515 anyway.

I'm with you Patrick. The front plate of my Neu is one solid piece with the sides of the can. Just the back plate is a separate piece.

o i was thinking an endbell was the end of the motor?

sorry i was wrong then. the rear or my motor screws off.

Well screw it back on and use a couple drops of blue locktight so it doesnt do it again.:sarcastic:

I thought the same as well, with the rear endbell being pressed in.

Lehner endbells are screwed in, though.

Yeah I think the rear is pressed as well, not screwed. I don't think it could be screwed on or off, because the wires wouldn't let it rotate.
Mine came loose a few months ago. My brother noticed it while the motor was out of the car, nothing happened while driving luckily.
I didn't see any threads on the endbell, so I just put some loctite on and pushed it back it. No problems since.

Maybe the 1521's are different? Because what's happening to BashOn's motor sounds pretty strange.

I have a 1521 and the can design looks the same as my 2 1512's. as other have said I believe its one piece and the endbell is pressed on.

I would contact Neu over this; i too think the rear is pressed on, and the front/housing is 1 piece?

I had to dissassemble my Neu 1512 because the bearings were not running smoothly anymore.

http://www.braintrust.at/2007/ds/rc/neu1512_img01.jpg

I also noticed that the endbell almost came loose on a few runs. The endbell is only pressed on. Which is rather dissapointing for a high class motor. The front bell/can is one piece. Some days ago after i had changed the bearings the endbell came loose for good and the rotor brushed against the stator.

http://www.braintrust.at/2007/ds/rc/...gestriffen.jpg
http://www.braintrust.at/2007/ds/rc/...gestriffen.jpg

On the other hand i noticed that on my Neu 1515 (Production date 1/4/2008) Neu Motors changed the design somewhat.

http://www.braintrust.at/2007/ds/rc/neu1515_img02.jpg

The endbell is now glued in and seems to be secured mecanicaly. There are some small marks around the can where the endbell sits. The bearings now are accessible from the outside. So i guess Neu Motors improved the design. The downside (with the new design) is my RC monster cover for the endbell will fall off.

Thanks for sharing othello!

The can of my 1521 is not one peice. Here is a photo of the 1521 and 1527 next to a Lehner 2240. The only thing I don't know if it's screwed or pressed. It might be screwed as mentioned in a post above.

Ah, yes i see, they are different indeed!

Well I'll be damned... The 1521 is different from the 1515 and 1512. I looked at my 1515 and 1512 cuz they were handy, but after seeing lutachs picture I dug my revo out from its winter hibernation and looked at the 1521 that is in it. And it does appear that the 1521 does have a separate front plate. Its not solid one piece like the 1515 and 1512.

So the Neu 1521 and 1527 are built differently since the Neu 1512 and 1515 are built with a front bell/can in one piece. Interesting, i wouldn't have expected this.

This is how my 1512 (and 1515) can looks like.
http://www.braintrust.at/2007/ds/rc/neu1512_img03.jpg

EDIT: jhautz was faster

hi

so we do not really know yet if the 1515 has a screwed backplate?
i have to admit it surprises me that those backplates were just pressed in in some motors.
i hope the frontplates on the those bigger 1520er series are screwed.

bye
rhylsadar

Neu changed the 1521 design, I think, last month. I had one of each. The new Neu uses a one piece front. The end cap is pressed in and held in with 4 roll pins. E-mail Steve Neu and you will get the story.

An end bell loosening itself from the can in a surface model like a car is nothing to worry about too much. In a helicopter or plane it could mean a total loss.

My truggy had no acceleration any more and felt like i had brakes engaged. My eagletree logger recorded the following data.
http://www.braintrust.at/2007/ds/rc/...n_98_graph.gif
You will notice those big amp spikes at the end of the run and a rise in motor temperature.

This improvement in motor design tells me i'm not the only one experiencing this issue. I wonder if the new design will prevent the end bell to come loose again in "minor" crashes or if i should secure it somehow.

Looks like my Neu is the two piece old design. I emailed Steve yesterday so we'll see what he says. Since it is no big deal I guess I won't worry much, but I would prefer to have the one piece front.

hi

if the frontplate is only pressed in it may be a real problem if you are jumping your truck a lot. the dynamics of the dead weight of the motor itself when landing will make that frontplate pop off quite easily like it happens on the feigaos.

bye
rhylsadar

Good point, and I plan on jumping this truck a lot.

Othello, I now have an explanation as to why FLYDMA.com has had a big sale on all their Neu's, some being HALF price!

They don't seem to have the 'new' ones yet however...

I bashed a little yesterday and again this evening. After each time it was loose. I am concerned.

I am going to see what Mr. Neu would charge to change out my housing for the 1 piece design. Maybe I'll be lucky and he'll do it under warranty. I'm pretty scared to jump this truck the way it is. Bashing is what my savage is about and right now I feel like I'd better be gentle.

Here's some Neu news: http://www.neumotors.com/20061222/News.html

I spoke to someone at Neu. She recommended that I use loctite on it and see if that solves the problem. I am going to give it a try, though I honestly would prefer for this not to be an issue for a motor of this price.... She said if it continues to be a problem I can send it in to be fixed.

I'll keep you posted, thanks everyone for the input

@zeropointbug
Flydma cleared their stock (as Neu will sell them directly) and at this price i couldn't resist taking a Neu 1515 (last one on their site) which has now replaced my Neu 1512 in my truggy.

@BashOn
I felt like you did when i first saw my endbell sticking out too far from the can. I instantly had pictures in mind of popped of Feigao endbells. Just glue it before it will pop off and you will have to deal with a grinded rotor. At least Neu Motors seem to have solved this issue with their new version.

I used a thick CA in one of my Feigaos and it worked good. I thought it would be too strong, but I just added a small amout in 4 places. In case you need to replace bearings, all you do is heat it to soften up the CA.

I couldn't resist getting a 1107/1.5D from flydma.com. I got it to compare with a Mega ACn16/15/1. Now I need to find an adapter to fit the normal 540 mounting holes.

Good news
 

Well whoever said the Neu 1521 (old design) has a screw on front bell was correct. I was about to apply some loctite and started twisting. To my pleasant surprise threads started showing. I backed the can out a little, applied some thread lock and tightened it up good. I used blue thread lock. If that doesn't work I'll move to red.

I feel much better knowing that the can screws down.

Yea... and we all know how easy it is to heat up a feigao. Just run it for 5 minutes.:lol:

That was a good one. I meant I used my little torch on the places I used the glue. Heat generated by the motor didn't make it come loose.

I would not use red lock tight on that, for 'whatever' reason you might have to take it apart in the future, red will be 'near' impossible to get off.