Or 5mm thick in hte XS wing(?).
In passing, I recall that Ivan claimed 9lbs(?) had been saved in coring out
the blue foam of the Classic wing. So if a lb of foam provides 30lbs of
buoyancy, then 270lbs of potential buoyancy has been lost from the Classic
wings; if/when the hollowed-out sections inundate after a ditching.
Duncan McF.
Duncan McF.
----- Original Message -----
From: "Graham Singleton" <grahamsingleton@btinternet.com>
Sent: Thursday, January 11, 2007 10:04 AM
Subject: Re: Europa-List: bouyancy
> <grahamsingleton@btinternet.com>
>
> Fred
> as Neville suggests, there is probably enough foam in an XS to float the
> engine. All you need to be sure is 2 cubic ft of blue foam, which you
> could put in behind the wing spar.
> You could estimate the amount of PVC foam, (about 5 lbs/cu ft,?) from the
> wetted area of the aircraft. It's 3mm thick. You know the weight, 1370lbs.
> Graham
>
> Fred Klein wrote:
>
>> All,
>>
>> Posted points are well taken...as I said, I intend to do some research on
>> the subject and will report back any information I gather...adding foam
>> may well be one of those seemingly simple notions which, upon
>> investigation, is fraught with peril.
>>
>> Fred
>>
>> On Wednesday, January 10, 2007, at 03:51 PM, NevEyre@aol.com wrote:
>>
>> Hi Bob / All.
>> The blue foam is pretty well closed cell, the type that is
>> definately closed cell is coloured orange, and sold as ''Flotation
>> Billet'' as opposed to ''Insulation Billet of the blue, as used in
>> the Europa.
>> The blue will not pick up too much water unless immersed at great
>> depth, where the pressure will force the water into the cells, so
>> fine at sea level ! It weighs 2lb. cu.ft, and a cu.ft will support
>> 60lbs in fresh water.
>> Most of the foams that are injected, are open cell, so will soak
>> up water like a sponge, the pour in types supplied to the marine
>> trade for bouyancy are very inconsistant in use, sometimes they
>> tend to expand to ''open cell'', which again will soak up water.
>> [I have seen boats foamed with this ''TOUCAN'' foam that
>> have absorbed so much water they barely floated]
>> The other problem with the ''pour in'' foams [ as opposed to the
>> blow in, injected types] is that the finnished volume can vary,
>> you can never be sure how far it will go. I have witnessed floors
>> ripped from hulls. Temperature of the two foam components. and the
>> space being foamed will have an effect. The warmer the foam and /
>> or space, the further it will go.What can happen, is that it fills
>> a space entirely, and ''gells'',[ so cant escape from the vent
>> hole] then carries on expanding, with sometimes disasterous
>> results.The power of foam expanding has to be seen to be believed!
>> I have seen a Range Rover that someone with a grievence had poured
>> some of this two pack foam into, puffed it out like a hedgehog,
>> totally round by the time it had finnished!
>> A Classic, I am sure , will have more than enough volume of foam
>> to stay afloat indefinately, an XS will eventually fill up, but
>> possibly ''lurk'' nose down just below the surface.
>> Cheers,
>> Nev.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _http://www.matronics.com/Navigator?Europa-List_
>>
>>
>>
>> _http://forums.matronics.com_
>>
>>
>>
>> size=2 color="#000000" face="courier new,courier">
>> href="http://www.matronics.com/Navigator?Europa-List";>http://www.matronics.com/Navigator?Europa-List
>>
>> href="http://forums.matronics.com";>http://forums.matronics.com
>
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