The Murphy Builders Site

Perhaps it's 5052?

Ron


On Sun, Jan 22, 2012 at 10:14 AM, Ron Shannon <rshannon@cruzcom.com>
wrote:

Is the .040 tank bottom skin 6061-T6 or something else? There are no
visible markings on mine, but they look different than the surrounding

6061.

Ron

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wrote:

Take my word for it........ trust me I know first hand.... really.

Of course I believe you, Jeff! ;-)

'm ordering 6 pairs of fuel tank access port covers and doubler rings from
a CNC shop and, for better or worse, their 2024 is almost twice as
expensive as 6061, so it will be the latter. :-)

Ron


On Sun, Jan 22, 2012 at 12:46 PM, Jeff Micheal <
westcoastkitplanes@gmail.com

wrote:

Take my word for it........ trust me I know first hand.... really.

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Ron,

If I remember correctly, you were concerned about sealing rivets if you
chose to put in tank access covers. So this leads me to the question of why
you would want to put in access cover doubler's and tank covers?

Is it the flush tank look you're going for? Cause flush mounting the covers
will not make you go faster..... and btw without doubler's won't slow you
down either.

Cheers,
Jeff

[ Ed: Thread fork alert! ]

Understood, and exhaustively considered, of course. Obviously, flush covers
require almost twice as many rivets as surface mounted covers with no
doublers. Just a personal choice, made with eyes wide open -- I think. More
than one expert builder I know of has chosen flush covers. If they can do
it, I can do it -- maybe! ;-)

Ron


On Sun, Jan 22, 2012 at 1:22 PM, Jeff Micheal
<westcoastkitplanes@gmail.com>wrote:

Ron,

If I remember correctly, you were concerned about sealing rivets if you
chose to put in tank access covers. So this leads me to the question of

why

you would want to put in access cover doubler's and tank covers?

Is it the flush tank look you're going for? Cause flush mounting the

covers

will not make you go faster..... and btw without doubler's won't slow you
down either.

Cheers,
Jeff

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Just putting in doublers makes access holes smaller w twice the work and
chance for leaks. Being an "expert" doesn't make the choice rite.
On 2012-01-22 2:39 PM, "Ron Shannon"<rshannon@cruzcom.com> wrote:

[ Ed: Thread fork alert! ]

Understood, and exhaustively considered, of course. Obviously, flush covers
require almost twice as many rivets as surface mounted covers with no
doublers. Just a personal choice, made with eyes wide open -- I think. More
than one expert builder I know of has chosen flush covers. If they can do
it, I can do it -- maybe! ;-)

Ron


On Sun, Jan 22, 2012 at 1:22 PM, Jeff Micheal
<westcoastkitplanes@gmail.com>wrote:

Ron,

If I remember correctly, you were concerned about sealing rivets if you
chose to put in tank access covers. So this leads me to the question of

why

you would want to put in access cover doubler's and tank covers?

Is it the flush tank look you're going for? Cause flush mounting the

covers

will not make you go faster..... and btw without doubler's won't slow you
down either.

Cheers,
Jeff

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...
I don't think that I'd need to design a patch with CAD though. A
sharpie, coffee can and a straight edge is all you really need.

The _only_ reason I used CAD software to design these things was to farm
out fabrication to a CNC shop. Of course I don't _need_ to use CAD software
to design covers and doublers, and don't _have_ to farm out the fab to a
machine, but it will save me a lot of time making 18+ of the large
perimeter/doughnut shapes in .040 by hand -- not to mention all the pilot
holes -- and will make the parts more uniform than I ever would. The cost
for 7 pairs of covers& doublers -- $113 USD, including material -- is,
IMHO, quite reasonable. The decision to flush mount does, obviously, entail
more work. That decision having been made, I prefer to minimize as much of
that work as possible, 'cause I'm still lazy. That I could design and fab
these myself is, to me, irrelevant. For those who would rather knock these
out by hand... fine, have at it.

As for the ongoing flush vs. surface mount debate, I'm not eager to
participate. The points made so far are all things I considered at length
before making a decision. No doubt, they will be useful to those still in
decision-making mode, but I've no interest in defending what is just a
personal preference after weighing the issues -- on my own scale. That is,
after all, one reason we build these things -- to do it the way we want,
and produce the result we prefer. (Call me contrary, but the more
emphatically someone asserts his way is the only correct way to do
something, the more careful consideration I tend to give the alternatives.)

Bottom line is I decided to flush mount the covers, and have a procedural
plan that I think will maximize the odds of success. To each his own.

Ron


On Sun, Jan 22, 2012 at 7:07 PM, Drew Dalgleish<drewjan@cabletv.on.ca>wrote:

...
I don't think that I'd need to design a patch with CAD though. A
sharpie, coffee can and a straight edge is all you really need.

...




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That makes sense. I was imagining only a couple holes.