Richard Lane wrote:

Anyone had experience looking for cabin rain leaks by pressurizing with
a shop vac?
Dick
be ***** careful!!! Ive done dinghy tanks with a foot pump before and it
works ok but we were VERY careful to keep the pressure really low.
Leaks were located with the aid of a 25% solution of washing up liquid
and a paint brush.

A quick calculation assuming a vacuum cleaner can reach 3 PSI and for a
deck 24' by 8' gives a force of over 40 tons on your deck/hull joint.

I guestimated the pressure with info from the Fermilab website where
they were getting 8 PSI differential using ordinary vacuum cleansers,
some on suck, some on blow to clean out a *really* expensive bit of high
tech kit. http://www.fnal.gov/pub/today/NuMIhorn.html

If you do decide to go ahead with this, *Please* record it on video for
posterity. If my predictions of doom are valid, it should be well worth
watching.

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL:
'Stingo' Albacore #1554 - 15' Early 60's, Uffa Fox designed,
All varnished hot moulded wooden racing dinghy.