>
    > >
    > > What I will use - since I am not into inverted flight ( yet
    > ? LOL ) I
    > > will use the idea of the cylinder rather than the bladder. In the
    > > cylinder - CPVC maybe - I will have the fluid on the bottom and the
    > > coolant line at the base with the air fitting at the top, but no
    > piston
    > > and no spring - rather a solid foam ball floating in the coolant
    > with
    > > only a few mm clearance between it and the walls. It will keep the
    > > liquid from sloshing near the base and keep mostly air above it.
    > Fail
    > > safe in most modes of flight.
    > > -dave
    >
    >
    > Dave
    >
    > You are joking right? Plastic unless you are talking Teflon is not
    > the best
    > substance to hold up in a stressful environment like an aircraft
   engine
    > compartment. I have lots of late night experience replacing CPVC
   of all
    > grades in pool filtration systems that are subjected to expansion
    > contraction cycles. The stuff micro fractures and is they are not
    > apparent
    > until sudden failure. Ie one large crack. Hard foam abrades and
    > ends up
    > clogging the radiator. Terrible for heat transfer characteristics:)
    >
    >
    > Go with aluminum if possible. Lots of tested vessels on the market.
    >
    > Doug in Japan
    >
    > -----------------------
    > Doug,
    >
    > I was not going to use CPVC it does not have the right properties.
    > does not support a high temperatures.
    >
    > I can use any of the following, it is individual choice.
    >
    > Steel wall thickness 1.0mm to 1.6 mm
    > Aluminimum wall thickness 2.0 mm to 4.0 mm
    > Plastic wall thickness approx 8.0 mm
    > There a only couple of types on the market that suit.
    >
    > The properties required for the right type of plastic are,
    > high heat support at least (140 deg C)this rules most plastics out on
    > the spot.
    > high impact
    > high pressure (this rules out most others)
    > able to see into it (tanslucent at a minimum)
    >
    > They are only a very few that meet these requirements.
    >
    > So if you want metal thats fine the functions are exactly the
   same just
    > the tube material changes.
    >
    > Regards David Gaze
    >
    >
    >
    > Lots of (most?) modern automotive radiators have plastic tanks
   (on the
    > ends of the core). There ARE plastics that will survive the temps and
    > pressures...
    >
    >
    > Matt-
    >
    > Yes but they are troublesome. It is automotive practice to use
    > a 15 psi radiator cap but most rotary powered aircraft are now
   using 30 psi caps.
    > I see no advantage in plastic over aluminum for aircraft use.
    >
    > Paul Lamar ...No rotor no motor.


   There is always transparent aliminum!
   --
   Blake C. Lewis

   That is a new one on me. In fact I have never heard of
   aliminum let alone transparent aliminum :)
   --
   Paul Lamar ...No rotor no motor.


   Paul,
   It's obvious you don't have x-ray vision.  If you were from the
   planet Krypton  you would have their special eye sight which allowed
   them to see thru their special metal, aliminum.

   Joel


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