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dean.psiropoulos(at)veriz
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 Posted: Thu Sep 25, 2008 9:57 pm Post subject: Question on jam nuts |
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I finished rigging my flaps a few weeks ago but discovered that the right
flap pushrod tube rides very close to the side skin when the flaps are
retracted (manual flaps). So close in fact that the sides of a jam nut
cause some interference such that the heim bearing at the top of assembly
(the flap arms connected to the handle) cannot go in to the u-shaped holder
at the end of the flap arm. If I try to push the bearing over to go into
the flap arm the jam nut touches the side skin and does not allow the top
bearing to move over any further (if I open up the side skin hole any higher
to clear the nut you'll see it on the outside of the airplane, ugly). This
is easily remedied by removing the jam nut and, since the pushrod tube moves
away from the side skin as the flaps are extended, there is never an
interference issue. I made the pushrod tube long enough that there is no
way it will ever spin off either heim bearing and I do have a jam nut at the
top of the tube (at the flap arm). My only concern is whether the jam at the
bottom is needed for extra strain relief on the pushrod tube. If you
recall, this is a thick wall aluminum tube that is threaded to accept the
heim bearings. Without the jam nut on the bottom bearing, all the stress
goes into the threads inside the tube. Whereas if there is a jam nut on the
bearing, some of the stresses are transferred to the entire wall thickness
of the tube. It would seem that having the jam nut on might help stave off
a failure of the pushrod tube that might occur without it. But....don't
know if I'm splitting hairs here. Is that what the jam nut is for? Will
there be a premature failure at that end of the tube if there is no jam nut?
Or...can I just fly without it? Thanks.
Dean Psiropoulos
RV-6A N197DM
First engine run this weekend.
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robertrv607(at)yahoo.com
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| Posted: Sat Sep 27, 2008 10:36 am Post subject: Question on jam nuts |
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Dean: I do not know too much on the Manual Flaps, I have Electric..
but I would follow the plans, always... In my case it call to install jam
nuts on both ends...the tube in my case has to be of exact length, other wised
flaps would not work properly, that is it would not be in the full up, or down possition,
for the exact no. of degrees...
You are talking on the connection, flaps, to fuselage side or the Wing side..
I know on the wing side, the bearing moves freely, it does not toch any thing, I have
about 1/8 clearance.. the Fuselage side, bering is visible on the under side..
I will take a look, and see...I would definetely usse the jam nuts...if the plans calls
for, there is a reason for...
Bert
rv6a
do not archive
--- On Fri, 9/26/08, DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net> wrote:
| Quote: | From: DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net>
Subject: Question on jam nuts
To: rv-list(at)matronics.com
Date: Friday, September 26, 2008, 1:49 AM
| Quote: | --> RV-List message posted by: "DEAN PSIROPOULOS"
<dean.psiropoulos(at)verizon.net>
I finished rigging my flaps a few weeks ago but discovered that the right
flap pushrod tube rides very close to the side skin when the flaps are
retracted (manual flaps). So close in fact that the sides of a jam nut
cause some interference such that the heim bearing at the top of assembly
(the flap arms connected to the handle) cannot go in to the u-shaped holder
at the end of the flap arm. If I try to push the bearing over to go into
the flap arm the jam nut touches the side skin and does not allow the top
bearing to move over any further (if I open up the side skin hole any higher
to clear the nut you'll see it on the outside of the airplane, ugly). This
is easily remedied by removing the jam nut and, since the pushrod tube moves
away from the side skin as the flaps are extended, there is never an
interference issue. I made the pushrod tube long enough that there is no
way it will ever spin off either heim bearing and I do have a jam nut at the
top of the tube (at the flap arm). My only concern is whether the jam at the
bottom is needed for extra strain relief on the pushrod tube. If you
recall, this is a thick wall aluminum tube that is threaded to accept the
heim bearings. Without the jam nut on the bottom bearing, all the stress
goes into the threads inside the tube. Whereas if there is a jam nut on the
bearing, some of the stresses are transferred to the entire wall thickness
of the tube. It would seem that having the jam nut on might help stave off
a failure of the pushrod tube that might occur without it. But....don't
know if I'm splitting hairs here. Is that what the jam nut is for? Will
there be a premature failure at that end of the tube if there is no jam nut?
Or...can I just fly without it? Thanks.
Dean Psiropoulos
RV-6A N197DM
First engine run this weekend.
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