Leslie Orosz wrote:

Bulent Aliev wrote:

I would like to get some idea, what is the best way to build the fuel
return system of the 13b in a Cozy

Dear Paul,
This is my first post to the group.  I really enjoy reading all the posts.
I am just now starting to build an UnCosy (15% scale up Cozy MK IV with a
20B) so this drawing is not backed up by any experience.  The attached file
is my fuel system design to date.  It is a primary secondary pumping system
(common in the air conditioning industry) and is based on Ed Anderson's
design with additions as suggested by Ross Farnham.

Failure modes considered  (the system will continue to provide fuel):
failure of low pressure primary pump,  failure,  of either secondary pump,
plugged fuel injector, clogged filter.

Two vent lines will be installed. One at the front of the strake and one at
the rear to provide venting in any attitude.  An Andair duplex fuel selector
valve will return fuel to the tank it is taken from.  By circulating fuel to
the header tank from the main tanks the header tank overheating problem
(potential vapor lock problem) is solved (capacity of the primary pump will
be = or > the capacity of the secondary pumps).  HP fuel pumps must have
built in check valves.  The check valve in the return line to the main tanks
prevents the HP pumps from sucking air under very low fuel level conditions
allowing full use of the fuel in the sumps.  Panel information will include
lamps to show which tank is selected, fuel level, low fuel lamps,  and a
fuel totalizer system.  Fuel fill neck and cap will be grounded to my
landing gear and engine exhaust pipe for easy attachment of ground clip.

I will be happy to post drawings of the rest of my systems as I complete
CADing them.  Criticisms and feedback welcome.
Is jpg ok for attachments?

Les M. Orosz
The UnCozy
lorosz@net-me.com

 
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