4 Blade

[Wayne Galligan]

I used the same method as described by Bob on my ST2300 till I got a Perry
pump/carb setup for it.  In my Prophecy the tank was high in the fuse so
when the plane was inverted the tank was low by as much as 3"to the needle
valve.  Worked great till I would pull a pretty good negative "G" maneuver
like the outside loop and then it would go lean.   You still have to have
the main tank fairly close on line to the needle valve. That is why Art
Wagner and others are having good luck with the system, close to the f.wall
and on line with needle valve.  Now I use a hopper tank to help eliminate
air bubbles in line or to transfer weight forward if needed on my pumped
engines.   So far the OS 1.40 seems like it would pump from the tail if
asked to.

Wayne Galligan


----- Original Message ----- 
From: <rcaerobob at cox.net>
To: <discussion at nsrca.org>
Sent: Thursday, August 12, 2004 12:03 PM
Subject: Re: Re: 4 Blade


> My personal experience with hoppers - from the ST 2300 days - is that they
work JUST FINE. Don't know the theory, either, but my intuition tells me
that being that much closer to the carb simply makes it that much easier for
the carb to draw using it's own venturi suction.  Easier to suck over a
shorter distance.  (Although sometimes things can suck over a longer
distance, too)
>
> I abandoned the header because of the pipe pressure line, extra fuel
tubing requirements, concerns over more possible failure points.  My Perry
pump accomplishes the tank on CG, and adds only 1.3 oz overall.  That's less
than my header tank and extra plumbing setups weighed.
>
> If weight not an issue, and you can locate the header tank on the
centerline of the spraybar, Go for it!!!  IT WORKS.
>
> Bob P.
> >
> > From: Brian Young <b.young8070 at sbcglobal.net>
> > Date: 2004/08/12 Thu PM 12:58:06 EDT
> > To: discussion at nsrca.org
> > Subject: Re: 4 Blade
> >
> > Yes, that hopper tank has bugged me since it came up. Theory says it
shouldnt improve the fuel draw, but in practice it must work. Maybe its the
line loss that causes the problem and an extra large fuel tube to the engine
would be good enough to mount the tank nearer the CG. hmmmmm
> >
> > Nat Penton <natpenton at centurytel.net> wrote:Dave,
> > An aclimation phase and a learning phase and some money! On another
subject, the physics say a hopper tank is of no value. What do you think? Is
there a momentary value? Karl - bypass the hopper tank and report!      Nat
> >
> >
> >
> >
>
> Bob Pastorello, El Reno, OK, USA
> rcaerobob at cox.net
> www.rcaerobats.net
>
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