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Other › Serious Problem with Neu 1521 Motor
01-16-2009 06:40 AM  9 years agoPost 41
specialtydevice

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New Rochelle , ny- USA

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Neu Motors do 50 to 60 grand rpms, the 1500 series that is

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01-16-2009 05:41 PM  9 years agoPost 42
kenneysme

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blgs. mt.

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Your right the 1515 has great power

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01-16-2009 07:45 PM  9 years agoPost 43
QueeQueg

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West Texas

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Neu Motors do 50 to 60 grand rpms, the 1500 series that is
With a planetary gearbox which doesn't put the kind of side loads on it that a spur gear does.

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01-16-2009 07:50 PM  9 years agoPost 44
HeliCSR

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Hesperia, Ca, US

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When you guys are snapping shafts, that is during HARD 3D right???
I mean has anyone snapped a shaft just flying around in circles?

Also maybe MR Neu, got a lot of shafts for that motor that had maybe more that 15% carbon in it, which will make the shaft brittle.

Kind of a welders knowlage there.

And to be fair to the other side, maybe your flying the heli too hard,
for the a 5mm shaft, and the suggestion of a 6mm shaft is the anwser.

Personally I'd like to know what kind torque in Ft/Lb's these
motors Actro, Neu, Hacker, Scorpian....put out.

I find it pretty amazing that these little motors can snap a 5mm
piece of steel.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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01-16-2009 08:42 PM  9 years agoPost 45
QueeQueg

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West Texas

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These motors can all hit peaks in excess of 4000 watts.

It's also not a continuous stress. It's repeated on again off again hammering especially from 3D

748 watts = 1 hp

4000W / 748 = 5.3HP

A motors torque I believe has to be measured on a Dynomometer but the HP can be figured from the following formula if you know the torque.

Torque x Engine speed) / 5,252 = Horsepower.

Like I said earlier you don't see any industrial motors trying to use such small output shafts for motors with the kind of power these things have. Everybody trys to get the most power out of the minimum mass for RC aircraft BL motors.

It would be nice to be able to run a single stage planetary gearbox of about 10 to 1 if doable directly under the mainshaft.

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01-17-2009 03:09 PM  9 years agoPost 46
specialtydevice

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New Rochelle , ny- USA

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When you guys are snapping shafts, that is during HARD 3D right???
I mean has anyone snapped a shaft just flying around in circles?
----------------------------------------------------------------------

No, Im convinced the shaft is faulty on the 1521. A Trex 600E is a cheap Chinese heli with cheap parts, especially the main gear. Most people fly them because the parts are cheap to fix from a crash. I carry a whole bunch of main gears when i goto the field as its common that the gear strips on hard 3D moves. Both times the shaft broke on the 1521 i was in the act of hovering. Ive done plenty of hard 3D moves with the 1515 (and it has just as much RPM and torque as the 1521) and always the main gear stripped and not the shaft break. In fact Ive had the 1515 for almost a year and no shaft problems. You see, the more winds the motor has, the less voltage (cells) it would take to maintain the rpm/torque. The 1515 is a 2.5d wind motor as the 1521 is a 1.5y wind motor. Therefor, the 1515 will maintain the same rpm/torque on 6s as the 1521 it would take 10s to maintain it. And the reason i went to the 1521, with the same amount of power as the 1515 was flight time. 10s on 1521 flies 3 minutes longer than going 6s with similar power and torque. IT JUST THAT THE 1521 WAS MADE WITH A FAULTY SHAFT THE NEU IS LIEING ABOUT AND NOT FESSING UP TO. So if you buy a 1521 Neu motor, not only will you have to spend $260 for the motor, but $80 to get a good shaft on it, like the one that comes on the 1515. So that brings the cost of the 1521 to $340. Im so glad i went with a 1915 motor on my Estratus that flies with 12s-14s. The shaft on that one is the same that comes on the 1515, but the motor rpm maxes out at 30,000, which is half of the 1500 series. I think Neu goes to these blogs to get feedback from us, the guinee pigs, and makes changes to his motors. But the *#*hole is not fessing up to his mistake of cutting costs and putting cheaper shafts on the 1521. In the repair that they charged me $80, my 1521 came back with a totally different shaft, they one they shouldve used in the first place. They certainly charged enough for the motor and the cheaper shaft that was put in was not justified.

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01-17-2009 04:00 PM  9 years agoPost 47
HeliCSR

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Hesperia, Ca, US

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Then the shaft is defective. They got brittle shafts and did not know it. And looks like they dont care.

No shaft should break duing hover, thats stupid.

Mr Neu, I think owes you a FREE replacement.

I crashed with Hacker C50 motor, no damage, All teeth stripped off
the main gear.

I crashed with Actro, no damage, all teeth stripped off main gear.

These companys that make RC motors, they have to get it thru their
head that we have thousands of dollars rapped up in our helis.

To make a motor that breaks on hover, well they should pay for damage
to our helis.

If fact they should twist test the shafts to see where the breaking point is, in other words they dont have quality assurance.

To say that a shaft breaks on crash, is to say that they dont fly
any helis with their motors in them or they would know better.

Its just like hacker master O 77 ESC, thats designed by someone
who dont even fly it in a heli. Because if they did they would know
as I have tested that the soft start-up as they call it that spun my heli around 90 degrees.

Now they would know this if they tested it in real time.

So the best ESC is a JAZZ, now thats a soft start up.

All I use now is Jazz and Actro, because these people I can tell
fly helis with their stuff in it.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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01-17-2009 04:36 PM  9 years agoPost 48
QueeQueg

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West Texas

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All I use now is Jazz and Actro, because these people I can tell
fly helis with their stuff in it.
I'm not sticking up for neumotors by any means but you should see what happens if you send an actro back. I have and paid dearly for getting some magnets glued back in that were clearly a defect.

Kohler is notorious for blaming everything on the pilot.

Hacker through Aeromodels is too.

My point being I have gotten a few raw deals over the years from different companies and no longer buy their products even after they fix the problems that they overlook on the first go around. I have gotten a bad 1515 and got the run around so I won't buy another regardless, just like I won't buy any of those others as
well.

Kontronics bends over backwards to fix issues.

And on the other hand I have gotten unbelievable customer service from others and will continue to support them as long as I can.

For instance i got an Eagletree FDR that came with a faulty USB cord. I didn't know what the problem was at first but contacted them and they immediately no questions asked shipped a another complete unit to me. When it turned out the FDR was fine but the cord bad they let me keep both units just for the trouble. That's service

Neus are now distributed by Castle Creations who is one of the best customer service companies in the business. They had all kinds of problems with the HV controllers when they came out and went to great lengths to fix them by paying for shipping both ways on the free repairs and replacements. I'm talking about with hundreds or maybe even thousands of controllers. For this reason I'll always buy their products.

I don't know if the shaft on a neu can be replaced by it self like an outrunner or if the whole rotor has to be replaced but if it can 80 bucks is mighty high for a 10 dollar shaft. And even if it can't it's not worth the 80 bucks charged when it generates this kind of negative public feedback which it will inevitably do.

Steve should take a lesson from his distributor.

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01-17-2009 05:28 PM  9 years agoPost 49
kogibankole

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albuquerque/ibadan

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i agree with quequeq 100%

if im not blade bogging youll find me pack puffing

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01-17-2009 05:38 PM  9 years agoPost 50
kenneysme

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blgs. mt.

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Shaft broke @the base of the set screw on a Neu 1515/2.5d,sent it in,hope its a flook shaft cause not many flights on it.
I agree shafts & bearings need to be larger or a carrier bearing on the end of the shaft to handle the torque from 3d flying.

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01-17-2009 05:58 PM  9 years agoPost 51
HeliCSR

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Hesperia, Ca, US

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I have gotton a free replacment from hacker after I few with the motor,
and then landed and heard the bearing spinning.

I sent it in and in 4 days I had a new motor from hacker no hassle.

And I picked Actro because it is the motor of all that I tested that
has the lowest temp rise.

Basically 15 degrees above whatever the air temp is, flying in circles
and hovering 20 degrees rise above air temp.

Hacker motor 40 degrees rise above air temp, even the ET.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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01-17-2009 06:35 PM  9 years agoPost 52
specialtydevice

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New Rochelle , ny- USA

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You guys arent getting it, the shaft broke on hover on two different 1521s Neu I bought one after the other and within the first 2 weeks of having them. Neu is not fessing up to them being faulty or any kind of warrenty. I got one repaired for $80 and it came back with the right shaft. Now I have a second 1521 with a broken shaft. Does anyone want to buy a 2 week old 1521 with a broken shaft?

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Other › Serious Problem with Neu 1521 Motor
01-17-2009 06:38 PM  9 years ago •• Post 53 ••
specialtydevice

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New Rochelle , ny- USA

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And i called Neu in San Diego and they covered it up by saying I mustve crashed for the shaft to break like that and its not covered by warranty. One of the guys I happened to get through to was a shop guy that obviously doesnt handle public relations and leaked out that they were 3rd party shafts that they used on that motor that shouldnt have been used. I bet if i said the guys name Neu would get rid of him...for being honest

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01-17-2009 06:47 PM  9 years agoPost 54
specialtydevice

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New Rochelle , ny- USA

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i wonder if there was another comparable motor to Neu that doesnt f*#@ their customers, i would go with them in a heartbeat and drop Neu. And not Scorpion with their dog outrunner motors. I spent thousands of dollarson my helis and i only put the best on them like the best ESC (Kontronics Powerjazz) and not use those dog ESCs that Neu pushes (Castle). If you buy substandard equipment to save a couple of dollars youll be spending it twice replacing it when it goes out. I originally had an 85 amp Castle with the Neu 1515 beleiving what i read on Neus website and it burned out, green smoke, going to a higher pinion with the same 6s battery. As soon as i went Kontronics it was the best thing i ever did and shouldve did it in the first place. $200 for the 85 amp castle was a waiste. I go Neu becauseimlead to beleive its the best, im finding out otherwise

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01-17-2009 07:02 PM  9 years agoPost 55
specialtydevice

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New Rochelle , ny- USA

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and the Scorpion i have as a replacement is a 4025-890 KV

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01-17-2009 07:05 PM  9 years agoPost 56
specialtydevice

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New Rochelle , ny- USA

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in hard 3d its the main gear that strips, not the shaft breaking!!! Theyre trying to tell me the cheap plastic main gear from Align is stronger than the metal shaft??

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01-17-2009 07:09 PM  9 years agoPost 57
kogibankole

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albuquerque/ibadan

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i was thinking the same thing, but i feel that there are many teeth to spread the stress out on the main gear so it might hold up longer than the shaft that drives it

if im not blade bogging youll find me pack puffing

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01-17-2009 07:51 PM  9 years agoPost 58
QueeQueg

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West Texas

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I've stripped the main gear, spun the pinion, broken 5mm shafts and trashed bearings all on helis with a bunch of different brands. The only way I've ever broken airplane motors is crashing or overamping them.

Even though I still have a couple neus they're in planes now where they work great. and my Actro is in a box although it does run the coolest of any motor I know as pointed out above. It has a loose noisy bearing and I don't feel like sending it back in I'll fix sometime myself.

right now I'm using scorpions because they're simple to work on yourself. They have good power and are reasonable. I do replace the bearings before I ever fly them with some better quality Japanese bearings and repack them with synthetic grease every 50 to 100 flights. They have an 8mm shaft with a 6mm output that I haven't broken.

SD if your scorpion is a dog you have a bad setup or a bad motor.

I don't see any big difference in power between the HK 4035 the 1915 or 32-3 I have or had I sold the neu to an airplane guy. They're all strong. I get very similar FDR readings from each motor using the same packs and heli.

helis just work the piss out of a motor. And unless you're willing to accept a 2 pound motor $hit happens.

In your case though I would be pissed breaking two shafts in succession just hovering. That's not right.

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01-17-2009 07:59 PM  9 years agoPost 59
Ronald Thomas

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Gainesville, Fl, USA

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and the Scorpion i have as a replacement is a 4025-890 KV
And that is the reason you say the Scorpion is a "dog"!! You need the 4035 which is what everybody uses in 600mm machines and up. Of course you thought the Scorpion was a dog, you were using a 500-550mm blades heli motor in a 600mm machine.
That was a lot of bad talk and you are using the wrong motor
Get the right motor, install it, spool up and HOLD ON!!!!.......Ron
BTW they come with 6mm shafts

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

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01-17-2009 08:02 PM  9 years agoPost 60
HeliCSR

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Hesperia, Ca, US

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As I said before the Shafts were brittle and defective.
No 5mm shaft should break in a hover.

Thats what I think.

SD why dont you get a kontronics motor, the other guy said they bend over backwards for customer support.

I fly and then I fly some more.
If it don't glitch then I won't crash.

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