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Thread: Questions: IVOPROP Medium IFA

  1. #21
    dginok's Avatar
    Join Date
    Aug 2009
    Location
    Norman, OK
    Posts
    92

    Default Re: Any videos on rebuilding/inspecting IFA motors?

    This shows armature replacement.
    https://youtu.be/3fygCCkOA9M
    Doug
    Super Sport
    912ULS
    Constant Speed IVOProp


  2. #22

    Join Date
    Jun 2016
    Location
    Wa
    Posts
    11

    Default Re: Any videos on rebuilding/inspecting IFA motors?

    Great, I appreciate that.

    It would be great if there was a vid, or even some pics that showed the rebuild of the gear set too. I bought a used prop with IFA recently and I had IVO rebuild motor, The guys at IVO were great about getting in done quickly. I hope that it last longer than what many have written about in several posts. I am just trying to prepare for the inevitable of rebuilding the motor, armature and gear set.

    I am especially curious about the idea of being able to rebuild the motor or gears without removing the prop.

    Charlie

  3. #23

    Join Date
    Jun 2022
    Location
    Ct
    Posts
    6

    Default Re: Questions: IVOPROP Medium IFA

    Quote Originally Posted by rc300xs View Post
    I appreciate your input and thank you! I thought I was alone on this.

    I might have led myself down the wrong path but I determined it was heat and too many amps. I tried a resistor as well as a lowering the voltage to 7.2 - 8.4 vdc. What do those two voltages remind you of? I opened the housing and found myself reminiscing of my days building RC cars. I was surprised to see a familiar motor. Impressively simple which I’m a huge fan of.

    I had issues with the armature showing an open. After replacing three motors and fixing 2 of them I had enough and went back to the ground adjustable. Each time IVO would send me another RC motor the same thing would happen after 10-20 hours. I started pulling the motors apart and found they measured wide open between the armature pads in all combinations, I narrowed it down to the connection between the winding and the tab of the contact pad. I only once found that it was a broken wire, in my case it was the solder that would become detached from the copper wire and leave black soot around the wire, through the solder under the tab and out the other side. (Like a cold solder joint with black soot) I inspected this with a microscope and it looked like it was literally burned open. I heated the solder and bent the tab up out of the way, then carefully cleaned the copper wire to get the soot off it. Next I measured from tail end to end and the entire winding loop was good. Next a little flux and bent the tabs back down over the wire and soldered it good. I now measured around 1.9 ohms between the pads. After using the motor for a few more hours it would quit again. Upon a second inspection I found the exact same thing. It was like the solder wasn’t attached to the wire anymore. Maybe vibration did this? Not sure exactly but I’ve never in my life seen solder break away from copper while it’s encased in it. (Other than maybe a cold solder joint). Maybe that’s what’s happening as well, again I’m not sure. This same failure happened on three motors and again on both of the motors I fixed. One of the motors I fixed however, on one of the tabs, did show a break in the wire right where the wire meets the solder. I believe that break was due to me removing the goop they had to steady the wire from vibration and centrifugal force, so I could work with it.

    Finally I went with a whirlwind and parked the IVO for a while. I called IVO and explained the situation and asked what the solution is. They seemed to NOW acknowledge that I wasn’t the only one with this issue but didn’t directly admit it (I got the feeling from them that this is a known issue now, in previous dealings with them they acted surprised). They said they’ve switched manufacturers and are now selling a new and better motor to resolve the issue. I ordered a motor and yes it showed up looking different. The new style is painted black and has the IVO Prop logo on it. For reference the older style motors are chrome. I tested this new motor and it works, but I haven’t tried it on the plane as I’m looking to sell the works. I’ll install and run it if it doesn’t sell as I love this IFA setup when it works. I should add that when it works it works exceptionally!!! Very impressed and a huge thanks to IVO for making such a great system. Not so much when it quits and I’m 3 hours from home stuck on fine pitch doing 85mph compared to the 115mph I normally get. Or I’m in short stuck on coarse pitch. I learned that lesson once and now I always check the prop that it will go fine pitch before landing short strips.

    To sum it up, if the winding maintains continuity with the armature I’m sure there’d be hundreds of hours trouble free operation.

    I also completely disassembled the planetary, cleaned and lubricated. Turns much easier now.

    Pelican PL
    912ULS
    Murle Williams through hub mod (highly recommend)
    IVO 70” medium 2 blade
    Have you ever tried the new motor ? I’m thinking about pulling the trigger on one and I am concerned about reliability.

  4. #24
    Senior Member Eric Page's Avatar
    Join Date
    Jun 2020
    Location
    Toledo, WA
    Posts
    863

    Default Re: Questions: IVOPROP Medium IFA

    rc300xs made his last post in this forum on 2/10/22. You might have better luck getting an answer if you send him an email. Click his username on one of his posts above, then click "Send email."
    Eric Page
    Building: Kitfox 5 Safari | Rotax 912iS | Dynon HDX
    Member: EAA Lifetime, AOPA, ALPA
    ATP: AMEL | Comm: ASEL, Glider | ATCS: CTO
    Map of Landings

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