Well, Mike ...
None of 'em are designed with Stunt in mind, and this is what we have been battling on and off for a while now.
Our abrupt corners stress these outrunners mechanically in ways that most E-folk do not. The Pattern guys share this problem, too.

The jury is still out on the Power 10's though we do not expect any unusual issues.

later,
  Dean

It's easy enough to twist some more pitch into that 13 x 4.5!
Dean

Thanks guys. I also got a pm from a local stunt flyer and excellent builder who has been using the Power 25 for several seasons and reports no troubles at all. As soon as I posted my query I realized "Nobody builds e-motors for stunt, come to think of it." I believe Rudy Taube has pointed out that 3-D RC flyers put stresses on their models that exceed anything we do in stunt (not counting crashes I suppose), with no problems on front or rear mounted motors. But I do see the mechanical benefit of front mounting and the stress reduction that would result.

None of 'em are designed with Stunt in mind, and this is what we have been battling on and off for a while now.
Our abrupt corners stress these outrunners mechanically in ways that most E-folk do not. The Pattern guys share this problem, too.
Dean

Good Morning, Dean
Do you know of actual mechanical (bearings, I suppose) problems caused by p-effect/precession forces in Pattern and/or 3D airplanes? Or C/L stunters, of course?
rgds, Peter Germann

Hi Mike,

E-Flite MOTORS = :-)

As others have said, you should have no problems with the E-Flite motors.

I use mostly Hacker motors, from my little foamies to my 17 lb. planes. But I do have 4 E-Flite motors and I like them. I fly my multiplex Acro Master at my local park (2 blocks away). It weighs 34 oz. and uses the excellent E-Flite 10 with an APC 12 x 6 on Hyperion 3S2200 batteries. I only have about 250 flights on this plane but I am always amazed at the power from this little 10. My plane will go straight up after launch doing rolls OOS. This is one powerful little motor.

FORWARD vs REWARD MOUNT

The above E-Flite 10  is FORWARD mounted and it works well. I have another E-Flite, the 480 in another forward mounted installation, and two other Hackers in a front mount. They all seem to work OK. But my other 6 electric planes are rear mounted, and they seem to be OK too. I have the E-Flite 110 REAR mounted with no problems.

Most of the guys at our large E flying field have their motors rear mounted. Some of these get stressed to the limits and they still work. I have to admit that I have not gathered any real data (# of flights before failure, etc.) from others, but I have not heard of any bearing problems with name brand motors. The turnigy motors are the only ones that seem to have problems. Some fail early (bearings and throwing magnets), but some seem to have a reasonable life span and perform OK.

I like to look to the Pattern guys for the LE in technology and way cool installation stuff. At the AMA Expo here in LA there was a drop dead gorges Pattern plane on display. It had a Hacker motor FORWARD mounted. They said they really put the nose ring/MM in SOLID with a lot of CF reinforcement. It was a beautiful install. They had a large CF spinner with long (about 1 1/2" x 3/16") curved slots cut out all around the spinner. I think there were about 5 of these cutouts. The curves looked like they were well thought out and looked like they would scoop up the air and force it through the very cut out backplate into the motor. The gaps around the prop were very small so the air had nowhere else to go but into the motor for cooling.  They said they tested the motor temps before and after this slot mod. It dropped the motor temps by 25 f. I thought this was a way cool solution. :-)  I wish I had my camera there, a photo would be nice here. Maybe Dean can help us here. ..... BTW, these guys told me Pattern has really gone to E power. So if anyone wants a nice big powerful supercharged YS engine, I'll bet you could get one cheap! ;-)

Below is a photo of my E-Flite 10 powered, 34 oz. Acro Master.

PS: I wrote this while Dean was posting. My reply above is not to Dean's post. ... The reply below is. ;-)

Hi Yoda, (AKA Dean :-)

Yikes! What were you guys doing up at 11,500 RPM? That's down right cruel to our little motors. ;-) You guys just have to get away from your WET "no pitch" props. Maybe this is why we don't see as many motor problems in ERC? We use larger pitch props and keep the RPMs down. 12 x 6, 14 x 7,  17 x 12, etc.

Regards,
Rudy       

Hello Peter,
I suspect that you'll be alright, but if you do have issues, they will happen between 75 and 100 flights; and that is what Bob and i saw two times after dropping into the nine-thousands after "going governed".

Now, i thought that Wolfgang was running either the geared hacker C50  or the new "Q" series outrunner. In any case, if he was running the 60S or 60M series hacker outrunners, it is important to note that they have the third, big-diameter, bearing at the circumference of the bell. This makes a big difference, as it prevents much of the center pylon bend and shaft bend!

In any case, it makes sense that Wolfgang had no problems. Stunt is way more violent to the motor than almost any 3-D ... and I realize that could be argued. 300+ degrees per second pitch rate at running RPM is the culprit.
Please give Wolfgang my regards.

Hi Rudy,
I did say that we ran those RPMs before we figured out how to run on the governor, so that was at full throttle. No ... throttling back was not an option.

take care,
   Dean P.


 

Guys,
I'm looking at the E-flite 32 vs 25 to replace an AXI 2826_10 in a 62oz ship and wondering if there is any significant disadvantage to the 2 bearing set up in the 32? I like the idea of the lower Kv motor to get me a little higher in governor range, I like to run around 9200. I see it was recommended for a couple ships but that was a while back, any new thought before I buy this motor?

Best,          DennisT