Any experience with Neu Motor 19-Series direct drive large Props?

[eJets]

Hi,

Does anybody has experience using a Neu Motor 19-Series (without gear) spinning a 20 to 22 Inch Prop?

I am not sure the 5mm Shaft and the ball bearings will withstand 3D-Acro on a 2kW-setup (peak)...

does anybody has experience on that?

thanks for your help/opinion.
eJets

[flyingtanks]

No direct experience but I know a guy who flies the AeroWorks Yak .90-1.20 with the Neu inrunner (pretty sure its a 19). He says it works great, is light, and stays cool. That's an 11lb plane with probably at least an 18" prop. Might be a 20".

[eJets]

Hi flyingtanks,

that sounds great - any chance to find out more details about? thanks!!

eJets

[Mike Palko]

The 19XX series is available with a 6mm shaft and larger bearings if requested upon ordering.

Mike

[Jeffery]

I asked about doing a 19XX with 8mm shaft since I just don't see swinging a large prop on a 5mm shaft. This was the response:

To do just one would be costly. It requires a new case housing and rotor end caps. If there were a application that would support the making of new parts in reasonable lots it could be done. By reasonable I would want a application where I would sell at least 200-300 in a year.

[Tipover]

I don't understand how they can be called outrunner killers if we can't swing an outrunner sized prop without killing them ;)

Kevin

[twest]

I don't understand how they can be called outrunner killers if we can't swing an outrunner sized prop without killing them ;)

Kevin
The largest neu 19xx motor weighs 14 oz. That puts it in the same weight class as, say, an e-flight 60 motor, which turns a 16 prop on 6s lithium. The fact that the 19 motors can turn large props up to 2000 watts is a testament to their design. Simply put, Steve needs to design some larger 8-pole direct inrunners that fit into the 2000+ watt, 20 inch prop category.

[Tipover]

As an example, my Hacker A50 16L is a 270kv/1500w motor. It’s happy swinging a 20 x 10 APC on 8s lipo/10s A123, right at 1500w WOT.

So one would assume that in theory the Nue 1912 3Y(also 270kv) would be able to swing the same 20 x 10 prop on the same battery. But, will the 5mm shaft really support that kind of prop load for long term reliability?

Kevin

[desert_flyer]

I agree - the 5mm shaft is risky with props>18in.

[eJets]

thanks for yyour feedback

[alchemique]

Read this post please - http://www.rcgroups.com/forums/showpost.php?p=8429553&postcount=50 :)

5mm is not enough. :]

[JPHen]

I have a 1912 in for service and I inquired about trading it in for a 1915 3y with a 6mm shaft. Will keep everyone updated.

Joe

[Jeffery]

I think the reason they have such small shafts is that they were designed as heli motors to compete with the Actro outrunners, hence the ORK designation.

[JPHen]

I just received my 1915 3y with 6mm shaft reverse mount. I found a thread where Steve Neu says a 6mm shaft should be able to support props from 20-22 inches, since the bearings were pretty stout. I plan on mounting this motor on my TopModel Giles and replacing my Hacker A60 16M using 10-12s and a 20x10 prop. Unfortunately my current Esprit mount for the A60 won't work with my Neu. However, I looked at the A50 mount and it looks like it may do the job (25mm mount spacing).

Since it's a back mount, I plan on reversing the A50 mount and using the rear bearing mount to support the front of the motor. Conveniently, the A50 also has a 6mm shaft, so I think it will work like a charm.


Joe

[AmpAce]

Another interesting motor in this class is the Cyclon 110 outrunner. It won't stand as much current as the Neu, I think it's rated at 2000 watts burst, but has an 8 mm shaft, will turn 20 to 22 inch props, and is about the same weight as the 1915 Neu.

Anyone have any experience with the Cyclon, especially with lower power applications?

AmpAce

[Neil Stainton]

I think using large folding props (available up to 23" dia) would very much reduce the risk of bending a 5mm shaft.

Neil.

[MikeAnderson]

How about a 1912/1y with a 4.2:1 planetary gear drive? That's what I've got for this winter's build of a 1:6.5 scale Spitfire MkIX project. The correctly scaled prop is 20" dia.

The max rated rpm for this motor is 30k, so I could go up to 10S but I'm going to try keeping the weight down with 7S LiPos. I'll be starting off with a 2-bladed APC 20x15E prop but I have my eye on a 4 bladed wooden prop (http://soloprops.com/) after I get all the ground handling and landing issues all sorted out. Oh and it will have the Benedini Merlin sound system too.

MotoCalc thinks the 7S setup will pull 50A at static WOT for a power loading of 100W/lb. The 10S will pull close to 90A but with a completely insane 300 w/lb.