Today's Message Index:
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1. 10:26 AM - Painting aircraft on the Science channel (John Cox)
2. 12:24 PM - Re: Painting aircraft on the Science channel (Bob Leffler)
3. 04:25 PM - Re: HS attach bracket issue (tsts4)
4. 07:36 PM - Front Wheel Axle Spacers - A Permanent Fix (David Hertner)
5. 10:32 PM - Re: HS attach bracket issue (John Cumins)
Message 1
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| Subject: | Painting aircraft on the Science channel |
Today Sunday at 5PM EST, tomorrow Monday at 4PM EST and on Christmas
day at 1:30PM EST there is a special called "How It's Made" which
features the aircraft painting process. A few of us might learn
something new on the Science Channel from Aerosmith Aviation. it is
episode #16.
John Cox
#600
Message 2
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| Subject: | Painting aircraft on the Science channel |
It was on a couple days ago too. They spent most of the time on the
chemical stripping process and a little time on filling misc patches. The
whole segment was only 4-5 minutes. Not very detailed.
From: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] On Behalf Of John Cox
Sent: Sunday, December 21, 2008 1:25 PM
Subject: RV10-List: Painting aircraft on the Science channel
Today Sunday at 5PM EST, tomorrow Monday at 4PM EST and on Christmas day at
1:30PM EST there is a special called "How It's Made" which features the
aircraft painting process. A few of us might learn something new on the
Science Channel from Aerosmith Aviation. it is episode #16.
John Cox
#600
Message 3
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| Subject: | Re: HS attach bracket issue |
Another option would be to shim it back to level. When you attach the HS to the
tailcone, two 1/8 shims get match drilled and placed under each bracket anyway.
So adding a 3rd, thin one to the stack shouldn't be a problem.
--------
Todd Stovall
728TT (reserved)
RV-10 Empacone
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220461#220461
Message 4
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| Subject: | Front Wheel Axle Spacers - A Permanent Fix |
Hi Everyone,
I want to share with you the permanent fix that I have come up with for
the front axle spacer problems we have been having lately. We have seen
everything from gouging of outer yokes to the bearing spinning on the
axle due to the loss of bearing pre-load.
I decided to take a real close look at the system to see what the root
problem is and I found that the spacers provided with the kit, both the
steel ones delivered with the kit initially and the aluminum ones sent
out as a fix do not interface with the bearing properly. This is due to
two issues.
The first is that the mating surface on the bearing for the spacer is
curved. I contacted Timken Bearing and they sent me the dimensioned
cross section of that bearing which showed that the curved mating
surface was a compound curve that melded two radii. This is not an easy
surface to mate to.
The second issue was that of the wall thickness of the aluminum spacers
set out by Van's to replace the initial steel ones. The wall thickness
of these aluminum spacers is .250in. The mating surface of the bearing
is approx. .187in. This is the steel contact area inside of the rubber
bearing seal. This meant that the spacer was pre-loading on the rubber
bearing seal instead of the steel portion of the bearing. In many cases
this has resulted in the loss of the pre-load as the rubber
deteriorates. Consequently, there were bearings spinning, yokes being
gouged and loose wheels which add to bearing wear and shimmy.
I initially thought that I would take the same approach as Ross Farnham
and machine profiles on the end of new steel spacers so that the
interface between them and the bearing was close to identical. I called
Ross and talked it over with him and he said that if he had more time to
put into it he would have made one of the spacers adjustable. I asked
him if I could run with that and he agreed it would be the best fix.
So, what I have been able to design is a system where there is a perfect
interface between the spacers and the bearings by utilizing the Timken
specifications and the accuracy of CNC machining. I have also been able
to design a robust and accurate adjustment mechanism into one of the
spacers so that the pre-load can be adjusted without having to take the
wheel apart.
Integrated into the spacer design are notches that accept the heads of
10-24 socket-head cap screws installed on the inner face of the yoke.
These restrict the spacers from being able to spin on the axle. As well,
you will now be able to accurately torque the front wheel bolt because
it no longer has any relationship to the pre-load of the bearings.
The screw adjustment ring is locked in place by two 1/4-20 socket-head
cap screws that have drilled heads so they can be safety wired.
All of these new components including the hardware is made from
stainless steel for durability and corrosion resistance.
I just finished installing a set in my front wheel assembly and it goes
together and adjusts very easily. I will be offering these for sale
through Mike Lauritsen at Cleaveland Tools. The kits will include all
hardware instructions and the drill guide used to locate the
anti-rotation screws.
You can go to my Blog site and read about these and see pictures of the
RV-10 as well as the RV6/7/8/9 components. It is located at the
following address: http://www.kitaircraftmods.com
I feel as though I have now installed a permanent fix to this problem
and I hope that if you are interested in the kit I have put together you
will go and visit the Cleaveland Tools site. The first 10 production
kits of each variant will be available sometime in mid January but
please leave your name with them if you are interested so we can get a
handle on how many are going to be required.
Many thanks for reading this long post.
Dave Hertner
RV-10 Builder #10164
Effectus AeroProducts Inc.
Message 5
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| Subject: | HS attach bracket issue |
Rene
I did just that this afternoon and it looks like i am good to go.
Bracket is re-rivited and parralel to the other.
thanks so much
On Sat 20/12/08 8:50 PM , "Rene" rene@felker.com sent:
Just an Idea, but since it looks like they were parallel when you
drilled them, just drill out the rivets..clamp them down and
re-rivet.
Rene'
801-721-6080
-----Original Message-----
FROM: owner-rv10-list-server@matronics.com
[mailto:owner-rv10-list-server@matronics.com] ON BEHALF OF
jcumins@jcis.net
SENT: Saturday, December 20, 2008 9:26 PM
TO: rv10-list@matronics.com
SUBJECT: RV10-List: HS attach bracket issue
Well all you rv10 buikders out there. Looks like i finally mide my
first big boo boo. And I will call Vans Monday morning.
When i final drilled the left and rt horv. stab fwd spar attach
brackets i made sure to clamp both of them to a piece of angle stock
so that they were final drilled parrallel to each other.
Well when i went to rivit them on today all looked well and i did
not think to reclamp them to a piece of angle stock. Now here comes
the probelm. The Left bracket is about 1/32 of a inch oft of
parallel to the other. When i clap the angle stock to the rt bracket
it contacts the inboard edge of the left bracket like it should.
When i clamp the angle stock to the left bracket it misses the rt
bracket by a bunch. so this telles me the left bracket is not
parallel.
I do think that it probable should be fixed, to prevent a twisting
force on the bracket, rivits and HS fwd spar.
My question is can i just shave a very small amount off the inboard
side of the left bracket bottom to get them back parallel, would this
be a ok repair or should i make new bracket and redo it.
I do think i will order the material to make a new on or order one
already made from the company that makes them on a cnc machine.
Boy was this very upsetting to find when i was finished with the
front spar.
Word of advice would be greatly appreciated,
Thanks.
John
Horz Stab build mode
SN 40864
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