Date: Sunday, October 18, 2009, 9:23 AM >I have the=A0IVO Magnum in flight adjustable 3 blade=A0prop with 45 to 105= inch pitch range.=A0 =A0 Chris:=A0 Are you using an ammeter=A0to set you pitch by chance?=A0 If so h= ow much of load is on it at fine vs. coarse pitch settings?=A0=A0Also have = you had to change out your brushes yet?=A0 I am hearing we should expect to= get about 15 hrs. on them before needing to change them out and wondered i= f your ground testing had validated that number yet... =A0 Thanks for the information. =A0 Doug Lomheim RV-9A, 13B, FWF, IVO =A0 =A0 --0-1834238135-1255891367=:62872 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable =

There is one other failure mode of the IVO prop brushes that all shoul= d be aware of besides wear.

At one point I found that my IVO prop no longer would adjust electrica= lly and proceeded to try to determine why.

What I found was that one of the brushes was stuck in the holder and n= ot able to slide freely due to some flakes of rust between the brush and th= e 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 te= nsion 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 repl= ace dut to the spring failure.

So due what you can to protect the brushes (and springs) from the elem= ents to prevent rusting.

Jim
--- On Sun, 10/18/09, DLOMHEIM@aol.com <DLOMHEIM@aol.c= om> 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 adjustabl= e 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. coar= se 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 you= r ground testing had validated that number yet...

Thanks for the information.

Doug Lomheim

RV-9A, 13B, FWF, IVO

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