hopper theory & practice

[Brian Young]

I basically agree w/ you. But I think the comment Dave L has made in his last couple of questions makes sense.
 
Im just bored and need something to do while im waiting for the delivery truck to show up.  ;)
 
Bob...we would Never ignore you.....lol
 

rcaerobob at cox.net wrote:
I know everyone ignored my first response about this - but I think it deserves consideration, guys. The hopper setup probably WORKS simply because it is closer to the suction source (proximity to the spraybar/venturi). Being closer, it is easier for the engine to "draw" the fuel.

I really don't think there's a lot more to this issue than suction.

Bob P.
Pump-running-non-suction OS user and ARF flier
> 
> From: Brian Young 
> Date: 2004/08/13 Fri AM 08:52:12 EDT
> To: discussion at nsrca.org
> Subject: Re: hopper theory & practice
> 
> Dave I think that your last couple of questions are what occur. If someone would put one in a hover for a few minutes to setup equilibrium it should lean once replenishment from the main tank becomes established in the new orientation, anyone want to try that? ;)
> 
> 
> ronlock at comcast.net wrote:
> 
> Ive been a hopper tank diss-believer for years. I also wonder why many continue to report benefits. What's responsible for the benefit?
> 
> I'm in agreement with Nat, and what "I think" Jerry has said regarding the fuel system with a FULL hopper tank being a column of fluid, and the hopper would have no benefit.
> 
> Maybe hopper serves to eliminate foaming and bubbles? Do I understand heli pilots use hoppers for that reason?
> 
> In practice do we usually have some air in the hopper? Or do we usually have a hopper tank that is flexible? Might we be drawing from the hopper without replenishing from the main tank during a vertical? Then the hopper gets replenished during level lines?
> 
> Still wondering, Ron Lockhart
> -------------- Original message -------------- 
> 
> > >Matt, 
> > >With or without the hopper tank we still have a solid column of 
> > >incompressible fluid for gravity and G's to play its tricks on. I 
> > >contend if it runs ok with the hopper it will run just as well 
> > >without. Nat 
> > 
> > Nat, 
> > 
> > While not exactly accurate as stated, your point is well taken. Your 
> > hypothesis has some merit when the tank is full, but it falls short 
> > anytime else (which is most of the flight). Adding just a small 
> > amount of air causes the system to become compressible (just like the 
> > brakes on your car). 
> > 
> > Jerry 
> > -- 
> > ___________ 
> > Jerry Budd 
> > mailto:jbudd at qnet.com 
> > ===================================== 
> > # To be removed from this list, go to http://www.nsrca.org/discussionA.htm 
> > and follow the instructions. 
> > 
> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net

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