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.
>
>
>
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>
>
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>
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