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From: randy echtinaw <rjechtinaw@ia4u.net>
Subject: Re: [FlyRotary] Re: Vapor Lock
Date: Mon, 21 Feb 2005 18:06:27 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Roll it out of the hanger, let it set in the sun, pressure builds,=20
sounds like a good way to blow something to me.


On Feb 21, 2005, at 5:47 PM, James Maher wrote:

> There is=A0a third option.
> Seal the vent when not flying.
> The vent in my fuel tank is a -4 size AN bulkhead elbow.
> I screw a cap on this fitting when not running the engine.
> When the cap is removed=A0there is usually a hissing sound indicating =
a=20
> vacuum or pressure in the tank. This also prevents fuel vapors from=20
> escaping which can be a hazard themselves.
> Jim Maher
>
> Ernest Christley <echristl@cisco.com> wrote:
>
> The end result is a pumping action. A very insidious and unavoidable
>  one. It doesn't matter what they tank is made of. A full day's heat
>  soak, followed by a full night's cooling will make the pump work. The
>  only way to stop is to:
> 1)Live in a place without water vapor problems. Either a very dry
>  environment, or one so cold that all the water sits frozen on the=20
> ground.
> 2)Seal the tank perfectly completely. At which point it won't work =
well
>  as a vehicular fuel tank, but at least won't have to worry about =
water
>  in the fuel.
>
> >> Homepage: http://www.flyrotary.com/
> >> Archive: http://lancaironline.net/lists/flyrotary/List.html