Wingnut need your help

[Soclarke]

Hey Wingnut,

Well we've been flying these 3D Pro's around for a while now but we keep having failures with these stock motors. Were you ever successful getting your setup with the Axi running? If so do you think you can post your setup. If it works well I think that's what we'll switch to.

[Neil]

Hello Soclarke,

First off the Axi has been flying now for about a month and a half in mine with no issues to report, running gov mode high on CC10. More power and less amps. I to went through the stock motor failing twice the magnets let go.

As for the Axi selection I went with the 2208-20, I also tested with the 2208-26 trying to keep consumption down to a minimum but I found that the 2208-26 is better suited to a 4s setup on the 3D Pro.

On 3s the 2208-20 bolts right in and brings the kv up high enough to use smaller pinions than what was needed with the -26, if you use a great planes 18 tooth 0.5 mod pinion( P/N GPMG0851 you will not need to do anything to fit the 2208-20 in. You will need to put a washer or two between the motor and the frame to act as a spacer, this gets the Great Planes gear high enough to mate up fully with the spur. You could grind down the base of the pinion closest to the motor to get it to come up a bit further on the shaft, but the washers work fine and less headache.
With this setup 2208-20 and 18 tooth 0.5 mod, by memory I'm running about 2400 RPM at the head and drawing about 3.5 amps no load and 10 amps full pitch @ 11 degrees. In flight I seldom see full pitch.

I will have to retest but I think a 20 tooth pinion will work better and lower your current consumption a bit, I think the motor is more efficient at the lower RPM that you get from the larger 20 tooth pinion and you can run a higher head speed.If you can only find a 48 pitch pinion you will need to file down the motor mount spacers between the frame halves a bit.If you find an 0.5 mod 20 tooth it might fit in with no mods but would be close, I'll let you know when I get one.
When I say file down the motor mount I mean you would want to make a flat spot on the sides of the motor mount spacers that go between the frame halves, this will open them up enough for a larger pinion to fit in. The height would stay the same, just file a flat spot on the rounded sides top and bottom where they flare out and then the pinion should fit in.
I have run both 48 pitch and 0.5 mod pinions, the only thing I can find is the mesh is a little smoother when running a proper 0.5 mod and there is a little less gear noise.
I have hooked up my meter and run both 48 pitch and 0.5 mod 18 tooth pinions and the numbers stay the same, and after several hours of use there is no excessive wear on the gears, so a little more noise seems to be the biggest issue. The 48 pitch Robinson Racing pinions that I have tried have worked well, also they don't require spacers under the motor.
When I was running the 20 tooth and 2800RPM at the head (overkill but fun) the 3D Pro would shoot up so fast from the ground that your neck would hurt, it sounded like a tie-fighter. To top it off I could not hear the motor bog at all. I would challenge any gasser out there to a vertical drag race, pink slips on the table (but don't expect me to give up my chopper if I loose):D

You should also check out Century's new outrunner for it. Drops right in, pinions are a little easier to come across and Century sells them for that motor so Richard would be able to stock them with the motor.
http://www.heli-world.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CNE262A&Category_Code=

Also there is the 400DF and DH from Just Go Fly that everyone is saying are great.
But my logic is the Axi 2208 I think falls into a 300 class motor and has more than enough power, the Century and Go Brushless motors are larger 400 class motors and I would assume are less efficient and would draw more juice from the pack to get it's power. So for now I will stick with the Axi, but who knows the other motors might be great. If you try either of them let me know what you find.

Anyways 5:45am just got up so still a little fuzzy, I see lots of text but not sure if it all makes sense.
So you have any questions just fire away and if you want a demo of the Axi in action let me know and I'll try to meet you at Discount one night

[Neil]

I just checked and the numbers I had posted are incorrect, I corrected above post.
Tested with TP Prolite 1320, AXI 2208-20, 18 tooth pinion.
Current no load 3.5amps, full pitch main and tail 10.25amps.

[Soclarke]

Thanks for the info Wingnut. We've ordered some Axi's and some pinions to give it a try. The cheap motors from Century are more trouble then they're worth.

On a side note I got my 3D Pro flying fairly decent last night. I was having some problems with it, mainly it seemed not to be responding to my inputs. As it turned out I had all my electronics clumped to close together and something was interfering with my Rx and causing it to go into a hold (Berg DSP). We moved the gyro to the back and moved the Rx away from the ESC and bingo! It was like a different bird. Unfortunately after that my tail servo gave out.

RC Heli = Money Pit

But fun! Very Fun!

[Neil]

hey Soclarke,

Sorry to hear about your tail servo I hope it did not cause to much grief.
And I could have shortened my answer, it was early and I'm not a morning person.

Money pit, yes. But once you get over a certain stage you'll find that crashes are few a far between.

Doing a stretch to mine, then I should be able to run 280mm blades. That will open the door to a larger selection of blades, and should help the Pro feel lighter on its feet.

Keep enjoying your 3D Pro

Neil

[cgroves]

hey Soclarke,
Money pit, yes. But once you get over a certain stage you'll find that crashes are few a far between.

Agreed, after a while your parts budget goes way down, unfortunately never zero but a lot less than the early learning stages.

[Soclarke]

The hardest part seems to be tuning these micros. While you're ironing out the bugs you seem to go through quite a few parts. So far we've found the nitro ones much easier to tune because things happen slower.

We're having fun though.

[Neil]

Hehe,

I have a bin of parts that look fine and probably are fine but as you said Soclarke you go through them ironing out the bugs.