There is one other failure mode of the IVO prop brushes that all should be aware of besides wear.
At one point I found that my IVO prop no longer would adjust electrically and proceeded to try to determine why.
What I found was that one of the brushes was stuck in the holder and not able to slide freely due to some flakes of rust between the brush and the holder.
The rust flakes came from the springs that provide tension to push the brush against the plate.
The springs were quite rusty and as a result did not provide enough tension to overcome the friction caused by the rust in between the bruch and holder.
There was still plenty of brush length left but they needed to be replace dut to the spring failure.
So due what you can to protect the brushes (and springs) from the elements to prevent rusting.
Jim
--- On Sun, 10/18/09, DLOMHEIM@aol.com <DLOMHEIM@aol.com> wrote:
From: DLOMHEIM@aol.com <DLOMHEIM@aol.com>
Subject: [FlyRotary] IVO Prop Question for Chris
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Sunday, October 18, 2009, 9:23 AM
>I have the IVO Magnum in flight adjustable 3 blade prop with 45 to 105 inch pitch range.
Chris: Are you using an ammeter to set you pitch by chance? If so how much of load is on it at fine vs. coarse pitch settings? Also have you had to change out your brushes yet? I am hearing we should expect to get about 15 hrs. on them before needing to change them out and wondered if your ground testing had validated that number yet...
Thanks for the information.
Doug Lomheim
RV-9A, 13B, FWF, IVO
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