Hi Nori,
I'll be interested to hear how it goes for you with your with using
the tire for the exit port, like
http://www.makepapercrete.com/The-Papercrete-Tow-Mixer.html.
I think
using a small car inner tube might make it easier -- I was
experimenting with a small truck tire inner tube and found it awkward.
Before cutting a hole in the bottom of your tank, I recommend you
work out the flange that you will use to bolt (pop-rivet?) the
elephant trunk to your tank, and get your tire wrapped around it. I
believe for it to work properly, you have to have the flange pretty
closely sized to the outside diameter of the tire tube you use. Also
you'll need to turn the tube inside out around the flange so you can
get the flange to seal up tight to your tank (it won't want to lay
flat on the tank bottom while you drill and pop-rivet it). Since the
tubes can be tough to stretch, I think the best material to make this
flange with would be something really stiff, like a piece of 1/8"
steel. Also, because there is only so much stretch, you probably
don't want to make this flange more than 3/4" wide, so you can
actually stretch the tube around it.
The easy part is cutting the hole in the tank, so postponing this
task until you've got a tire and flange that you can work with might be wise.
Best,
Eric
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