John Bouyea I have not completed my KR2S as of yet. But you bring up a good 
point .  I'm the type of guy simple is better . I was flying my V6 STOL 
experimental aircraft I had topped my  tanks off and I went airport hopping 
check out my buddy's there is a local private airport/ club I visit and 
normally top off on fuel while I'm there (cheap).I don't  trust gauges so I 
stick my tanks I was flying on my right tank for some reason only God knows  I 
checked the left  tank and it was less than 1/2 tank so I went and started 
investigating and my buddy's  and i found between the vent and the cap is lost 
about 10 gallons of gas it's changed the cap and shorten the vent tube and 
never had that problem again.  But you are so right check it out  be sure where 
your fuel is . All I had was a left and right tank on and off simple. 

Sent from Yahoo Mail on Android 
 
  On Sun, Aug 4, 2019 at 4:55 PM, John Bouyea via KRnet<krnet@list.krnet.org> 
wrote:   I've thought a lot about the "Tacoma" incident and have a question to 
ask
those with auxiliary fuel tanks: "Is it possible fuel could move in your
system without you knowing about it?" I.E. the quoted "Fuel Starvation"
situation referenced below.

If gravity is the primary fuel flow design to the engine, gravity could also
move the fuel "elsewhere". Like out a vent, an overflow, the "wrong way"
through a fuel selector valve or even through a failed backflow/ check
valve. (The failed backflow/ check valve situation happened in my Cardinal's
vent lines many years ago.)

I encourage everyone who has multiple tanks to do a real-world inspection/
test of your system to see if your fuel could (or DOES!) move the wrong way.
This might even be part of a regular inspection program.

 

Like everyone else, I applaud the safe outcome last week by the KR2 pilot
who put his airplane on the ground without any injury or damage to it or
other people or property. Well done Sir!

 

Supplemental reading:

In light of the recent and very successful off-airport landing in a KR2, the
FAA posted an initial finding;
(https://www.asias.faa.gov/apex/f?p=100:96:16319109398827::::P96_ENTRY_DATE,
P96_FATAL_FLG,P96_MAKE_NAME:02-AUG-19 )
"AIRCRAFT RAN OUT OF GAS AND LANDED ON PACIFIC COAST HIGHWAY."

I think there was gas in the airplane, just not where it could make its way
to the engine. If so, this certainly isn't the first time as many incidents
have occurred in aircraft with complex fuel systems and multiple valves in
the design. AOPA has  several articles online about this issue. Quote from
https://pilot-protection-services.aopa.org/news/2018/september/01/runnin-on-
empty 

"Running out of gas in the air is not quite as simple as it might seem.
Running out of gas is referred to by the NTSB as "fuel exhaustion." There
are also accidents, called "fuel starvation," that occur when there is still
gas in the tanks that doesn't reach the engines. This can be due to things
like improperly set fuel selector, water contamination, or cross feed
errors. Fuel exhaustion accounted for 56% of fuel-related accidents while
fuel starvation was responsible for 35% of these accidents. Other incidental
incidents complete the package." Elsewhere in that quoted article, AOPA says
these types of incidents happen 2 or 3 times per week.

 

John Bouyea
KR-2S - 709 TTAF
OR81/ Hillsboro, OR
2015 KR@MMV Gathering CoHost

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