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rparigor(at)suffolk.lib.n
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 Posted: Tue May 13, 2008 8:26 am Post subject: Jim Browns cracked tank |
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When I researched tank cracking, Jim Brown was kind enough to send me a (wierd style) PDF of his tank crack. I tried to put it up in Gallery but it didn't work.
I posted it to Document section if anyone is interested under "Jim Browns cracked tank".
My reply to cracking is documented in Gallery:
http://www.europaowners.org/modules.php?set_albumName=album233&op=modload&name=gallery&file=index&include=view_album.php
or if link is a hassle to deal with go to Gallery
4th album down: A-265
then: Say "NO" to Crack (in fuel tank).
Say "NO" to Crack (in fuel tank).
Visit - www.EuropaOwners.org
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fklein(at)orcasonline.com
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| Posted: Tue May 13, 2008 11:05 am Post subject: Jim Browns cracked tank |
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Ron,
When you took your described precautions (BID'ing the tunnel, and
foaming the tank bottom), were you aware of the tank's tendency to
absorb fuel and consequently expand (in accordance w/ Svein's posts;
i.e., expansion must be allowed for), or do you have a different take
on the situation?
Ron (or Anyone)...Can you say w/ certainty that our tanks are
LDPE?...or HDPE?
Fred
On Tuesday, May 13, 2008, at 09:23 US/Pacific, rparigoris wrote:
| Quote: |
<rparigor(at)suffolk.lib.ny.us>
When I researched tank cracking, Jim Brown was kind enough to send me
a (wierd style) PDF of his tank crack. I tried to put it up in Gallery
but it didn't work.
I posted it to Document section if anyone is interested under "Jim
Browns cracked tank".
My reply to cracking is documented in Gallery:
http://www.europaowners.org/
modules.php?set_albumName=album233&op=modload&name=gallery&file=index&i
nclude=view_album.php
or if link is a hassle to deal with go to Gallery
4th album down: A-265
then: Say "NO" to Crack (in fuel tank).
Say "NO" to Crack (in fuel tank).
Visit - www.EuropaOwners.org
|
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| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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rparigor(at)suffolk.lib.n
Guest
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| Posted: Tue May 13, 2008 11:53 am Post subject: Jim Browns cracked tank |
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Hi Fred
"When you took your described precautions (BID'ing the tunnel, and
| Quote: | foaming the tank bottom), were you aware of the tank's tendency to
absorb fuel and consequently expand"
|
Yes I was aware tank can expand. The foam is not applied directly to the
tank, I have a piece of mylar under the tank and the foam is underneath
the mylar, thus the foam is not bonded to the tank, the tank can move if
it cares to. The foam should support a good majority of weight of a full
tank, not rely on just cantelevering hold of aft BID layups. You can see
in Jims pics that the plastic just kinda flowed. The BID in tunnel should
relieve the sharp edge stress riser of the aft factory layup. I have the 3
BID tapered so there is not a sharp edge ending. If the tunnel of the tank
wants to expand, I can not see that the additional BID would causing a
crack to occur.
I attached a pic of Steve Hagars top of tank, if you had 3 BID on top of
tank when it was flat, not that you would want to do such a thing, but if
you did, I don't think it would cause cracks to occur. On the other hand
the tunnel layup and the lay ups on the aft base of the tank are all that
is supporting the majority of the weight of the tank. If I didn't already
have CPM bonded in, I would 3 taper BID the base supports as well. I think
the foam will take a real load off all 3 by not allowing the tank to
cantelever as compared to not having foam.
Ron Parigoris
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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rparigor(at)suffolk.lib.n
Guest
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| Posted: Tue May 13, 2008 11:53 am Post subject: Jim Browns cracked tank |
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|
Hi Fred
"When you took your described precautions (BID'ing the tunnel, and
| Quote: | foaming the tank bottom), were you aware of the tank's tendency to
absorb fuel and consequently expand"
|
Yes I was aware tank can expand. The foam is not applied directly to the
tank, I have a piece of mylar under the tank and the foam is underneath
the mylar, thus the foam is not bonded to the tank, the tank can move if
it cares to. The foam should support a good majority of weight of a full
tank, not rely on just cantelevering hold of aft BID layups. You can see
in Jims pics that the plastic just kinda flowed. The BID in tunnel should
relieve the sharp edge stress riser of the aft factory layup. I have the 3
BID tapered so there is not a sharp edge ending. If the tunnel of the tank
wants to expand, I can not see that the additional BID would causing a
crack to occur.
I attached a pic of Steve Hagars top of tank, if you had 3 BID on top of
tank when it was flat, not that you would want to do such a thing, but if
you did, I don't think it would cause cracks to occur. On the other hand
the tunnel layup and the lay ups on the aft base of the tank are all that
is supporting the majority of the weight of the tank. If I didn't already
have CPM bonded in, I would 3 taper BID the base supports as well. I think
the foam will take a real load off all 3 by not allowing the tank to
cantelever as compared to not having foam.
Ron Parigoris
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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rparigor(at)suffolk.lib.n
Guest
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| Posted: Tue May 13, 2008 11:53 am Post subject: Jim Browns cracked tank |
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|
Hi Fred
"When you took your described precautions (BID'ing the tunnel, and
| Quote: | foaming the tank bottom), were you aware of the tank's tendency to
absorb fuel and consequently expand"
|
Yes I was aware tank can expand. The foam is not applied directly to the
tank, I have a piece of mylar under the tank and the foam is underneath
the mylar, thus the foam is not bonded to the tank, the tank can move if
it cares to. The foam should support a good majority of weight of a full
tank, not rely on just cantelevering hold of aft BID layups. You can see
in Jims pics that the plastic just kinda flowed. The BID in tunnel should
relieve the sharp edge stress riser of the aft factory layup. I have the 3
BID tapered so there is not a sharp edge ending. If the tunnel of the tank
wants to expand, I can not see that the additional BID would causing a
crack to occur.
I attached a pic of Steve Hagars top of tank, if you had 3 BID on top of
tank when it was flat, not that you would want to do such a thing, but if
you did, I don't think it would cause cracks to occur. On the other hand
the tunnel layup and the lay ups on the aft base of the tank are all that
is supporting the majority of the weight of the tank. If I didn't already
have CPM bonded in, I would 3 taper BID the base supports as well. I think
the foam will take a real load off all 3 by not allowing the tank to
cantelever as compared to not having foam.
Ron Parigoris
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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fklein(at)orcasonline.com
Guest
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| Posted: Tue May 13, 2008 3:54 pm Post subject: Jim Browns cracked tank |
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On Tuesday, May 13, 2008, at 12:49 US/Pacific,
<rparigor(at)suffolk.lib.ny.us> wrote:
| Quote: | The foam is not applied directly to the tank, I have a piece of mylar
under the tank and the foam is underneath the mylar, thus the foam is
not bonded to the tank, the tank can move if
it cares to.
|
Ron...yes...I saw the mylar...nice bond break/separator. I like what
you've done and intend to replicate it...looks like an ounce of
prevention to me.
I've already added a vertical separator of sorts which would allow some
bulging of the tank forward face but would prevent such bulging from
interfering w/ the spars and spar strap. It consists of a 3 bid layup
w/ 1/4" x 1/2" balsa stiffeners w/ 2 bid layup and a top flange which
is floxed to the underside of the "shelf" support; it extends down to
between the 2 FG spacers. I hot glued some 1/8" poly foam as a
cushion...pix below.
I'm still curious as to what our tanks are made of...LDPE or HDPE...(?)
Fred
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| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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