Hopper Tank

[Karl G. Mueller]

Nat,

Your right about the 2 columns of fluid when going vertical using a hopper tank
which should reduce the pressure at the carburetor.
But don't forget about  the pressure supporting the 2 columns either from 
crankcase or pipe pressure. This is what makes it a more constant pressure
at the carburetor, whether the plane is in a horizontal or vertical attitude. "G"
forces also increase when going vertical and the pressure in the main tank
will support these as well. It works very well. I would not run any setup in a
pattern ship without a hopper tank.
Setting up a hopper tank is not as complicated as it sounds. It is not a cure 
for fuel foaming. This has to be done by isolating both tanks from engine
vibration. 
No Voodoo involved here !!!


Karl G. Mueller
kgamueller at rogers.com

----- Original Message ----- 
  From: Nat Penton 
  To: discussion at nsrca.org 
  Sent: Friday, August 13, 2004 11:14 PM
  Subject: Hopper Tank


  OK guys I've heard all the arguments and i'm not buying it.
  All of the supportive arguments are subjective or have alternate explanations. Even if there is a vapor head in the hopper the instant you go vertical the pressure at the carb is reduced by the total column height of the fluid. Up versus down is two column heights variation in pressure. Further the use of a hopper is a complex way to solve a foaming problem.
  ( Bob ) thats my story and i'm sticking to it.
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