lml@lancaironline.net Mailing List Archive

My understanding of the bob weight is not for balance due to flutter. The control surface is balanced with out the bob weight. The bob weight is there to reduce the pitch up tendency in PIO's ex. as you pull or pitch up the bob weight counters your pitch up and as you pull G's it makes it increasingly harder to pull aft or pitch up. Hope that makes sense. I removed my bob weight and did all my first 40 hours with out it. Afterwards I reinstalled it and flew with it. I personally did not like it, having a delayed feel to it in flight. I can believe it could possibly upset a auto pilot . It did how every make it easier to not over control but then again I don't have an over control problem even with out it.

I am currently installing a tru trak auto pilot and also installed the servo in the tunnel( 1/4 of it) ) behind the pass. seat with the ring clamp. I haven't finished the wiring harness yet so can't comment on its function.

Steve Alderman N25SA 360

-----Original Message-----
From: John Barrett <2thman1@gmail.com>
To: lml <lml@lancaironline.net>
Sent: Tue, Mar 18, 2014 10:41 am
Subject: [LML] Re: Autopilot servos and L360 bobweight

Bob weight is there to balance the control surface . Out of balance can carry risk of flutter. Be sure to research before changing that relationship.

John

Sent from my iPad

On Mar 18, 2014, at 6:52 AM, "Jack Dysart" <jldysart1@gmail.com> wrote:

My Tru Trak autopilot altitude hold is inconsistent, and opinions are that the servo had difficulty working properly because of the mass of the bobweight on the elevator idler arm. One possibility is to remove the weight and expect more pitch sensitivity (lighter stick force) in turns. Has anyone found other alternatives?

What if the mass of the bobweight is reduced?

My servo is behind the seat and connected to a ring clamp on the elevator control tube with a smaller, roughly parallel, rod with bearing ends.

Jack Dysart