OS 160FX setup

[John Pavlick]

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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