OS 160FX setup

[George Kennie]

John,
It was so long ago that I can't remember all of the specifics, but
as I recall, I had a particular engine that was giving me some kind
of fits and in desperation I tried a uniflow set-up. I can only tell
you that since that time I have never even thought about using a
uniflow set-up again. I think my conclusion at the time was that it
just wasn't worth the extra effort as I found no advantage to the
system, although I have to admit, it sure sounded good on paper.
Georgie

John Pavlick wrote:

>  Since we're discussing fuel systems, Pascal's law, and other good
> things, while trying to achieve a perfect engine run regardless of
> fuel level... Has anyone tried a Uni-flow (2 clunk) setup in a
> pattern plane? I'd be very interested in confirming some of my
> observations with the experience of some of you guys. Dean or
> Dave???
>
> John Pavlick
> http://www.idseng.com
>
>
>      -----Original Message-----
>      From: discussion-request at nsrca.org
>      [mailto:discussion-request at nsrca.org]On Behalf Of
>      Rcmaster199 at aol.com
>      Sent: Thursday, December 02, 2004 6:08 PM
>      To: discussion at nsrca.org
>      Subject: Re: OS 160FX setup
>      I believe topper tank works in similar fashion to how
>      Ancients (Romans)  were able to make water flow up a
>      hill: hydraulic flow, once established inside a closed
>      pipe of size X, will continue under atmosperic pressure,
>      as long as the rise isn't beyond some level. A series of
>      such ducts allowed them to bring water pretty high up.
>      The trick was in getting flow started. I believe a
>      similar set of conditions is esatblished in this kind of
>      plumbing. Vapor pressure in the main tank is actually a
>      little above atmospheric, facillitating fluid flow. The
>      topper tank is close enuff to the tank such that venturi
>      action does its thing MattK
>
>           For the life of me I can't understand how the
>           hopper tanks work. If the main tank drops 6
>           inches, then you still have to pull fuel from
>           6 inches, with or without the hopper tank. The
>           only way I can think of it working is if there
>           is some air in the hopper, then momentary
>           changes in the main tank height won't be felt
>           at the carb, but extended up/down lines would
>           be. Still, it seems to work, and may be the
>           route I would go. I like simple. Bob Richards.
>
>
>

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