From: "Todd Bartrim" <flyrotary@lancaironline.net>
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Date: Tue, 22 Aug 2017 02:32:35 -0700
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Subject: Re: [FlyRotary] Re: Heat Soak & Fuel Purge valve- Another half baked idea?
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Andrew;
  One of the problems with putting this stuff out there on the web is that
then you've got to keep it updated. Which I haven't. In many, many years.
So the original fuel system that I posted so long ago is out of date. Along
with much of the thoughts and ideas that I had back then. I guess I'd just
assumed my old web site would be slowly ignored as it is so out of date
even in it's appearance.
   I did make an updated diagram of my current system, but I can't seem to
find it right now. I may have foolishly saved it onto the local hard drive
on my work computer.  So I hope that the similarities don't extend to the
things that I changed because they turned out not so good.
  anyways, glad to hear of a successful use of the bleed valve. Purging the
air was another thought as well since I have too many tanks as well and
have added in sensors to allow me to know exactly when the auxiliary tanks
are completely dry and the moment that air enters into the first 6" of fuel
line exiting those tanks. But air in the system is always a possibility
that I'd like to have an escape plan for.
  I should mention that in my previous flight experience I did test this
in-flight while high above the airport and found it was much easier to
clear air than fuel vapor. My first system with the header tank was
particularly troublesome with fuel vapor. But when air was in the line in
the system without the header tank, when I ran the tank dry until the
engine quit in flight (at 8000'AGL, so lots of room), once I switched tanks
and facet pump (boost) on it was surprisingly quick to put the air through
the injectors with the prop windmilling and the engine would just smoothly
start and go like nothing had happened. Didn't lose more than a few hundred
feet. Vapor in the header tank was a different story.

Todd  --- if I stay up any later, you guys are gonna start thinking I'm in
Oz too.

Todd Bartrim

On Tue, Aug 22, 2017 at 1:16 AM, Andrew Martin <flyrotary@lancaironline.net>
wrote:

> Todd. I did similar to your system, probably because you've got the best
> documented fuel setup I found on the web for rotary powered plane.
>
> My pumps are close to left main tank so dont get exposed to same temps as
> yours, but fuel rail still heat soaks and is semi returnless.
>
> I made sure I put in a bleed (just some very tiny part I found from a
> carby kit) between high & low side of regulator mount, Allows pressure to
> bleed off when pump is off. so pump is not under vapour pressure when
> trying to prime. Dont seem to have lost any pressure during normal ops.
>
> Also have the solonoid, just in case I need to purge air faster from low
> pressure side in case I run a tank dry in flight ( 4 tanks so its just a
> matter of time).
>
> Andrew
> --
> Regards Andrew Martin Martin Ag
>

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<div dir=3D"ltr">Hi Andrew;<div>=C2=A0 One of the problems with putting thi=
s stuff out there on the web is that then you&#39;ve got to keep it updated=
. Which I haven&#39;t. In many, many years. So the original fuel system tha=
t I posted so long ago is out of date. Along with much of the thoughts and =
ideas that I had back then. I guess I&#39;d just assumed my old web site wo=
uld be slowly ignored as it is so out of date even in it&#39;s appearance.<=
/div><div>=C2=A0 =C2=A0I did make an updated diagram of my current system, =
but I can&#39;t seem to find it right now. I may have foolishly saved it on=
to the local hard drive on my work computer.=C2=A0 So I hope that the simil=
arities don&#39;t extend to the things that I changed because they turned o=
ut not so good.</div><div>=C2=A0 anyways, glad to hear of a successful use =
of the bleed valve. Purging the air was another thought as well since I hav=
e too many tanks as well and have added in sensors to allow me to know exac=
tly when the auxiliary tanks are completely dry and the moment that air ent=
ers into the first 6&quot; of fuel line exiting those tanks. But air in the=
 system is always a possibility that I&#39;d like to have an escape plan fo=
r.</div><div>=C2=A0 I should mention that in my previous flight experience =
I did test this in-flight while high above the airport and found it was muc=
h easier to clear air than fuel vapor. My first system with the header tank=
 was particularly troublesome with fuel vapor. But when air was in the line=
 in the system without the header tank, when I ran the tank dry until the e=
ngine quit in flight (at 8000&#39;AGL, so lots of room), once I switched ta=
nks and facet pump (boost) on it was surprisingly quick to put the air thro=
ugh the injectors with the prop windmilling and the engine would just smoot=
hly start and go like nothing had happened. Didn&#39;t lose more than a few=
 hundred feet. Vapor in the header tank was a different story.</div><div><b=
r></div><div>Todd =C2=A0--- if I stay up any later, you guys are gonna star=
t thinking I&#39;m in Oz too.</div></div><div class=3D"gmail_extra"><br cle=
ar=3D"all"><div><div class=3D"gmail_signature" data-smartmail=3D"gmail_sign=
ature"><div dir=3D"ltr">Todd Bartrim</div></div></div>
<br><div class=3D"gmail_quote">On Tue, Aug 22, 2017 at 1:16 AM, Andrew Mart=
in <span dir=3D"ltr">&lt;<a href=3D"mailto:flyrotary@lancaironline.net" tar=
get=3D"_blank">flyrotary@lancaironline.net</a>&gt;</span> wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div dir=3D"auto">Todd. I did similar to your syste=
m, probably because you&#39;ve got the best documented fuel setup I found o=
n the web for rotary powered plane.</div><div dir=3D"auto"><br></div><div d=
ir=3D"auto">My pumps are close to left main tank so dont get exposed to sam=
e temps as yours, but fuel rail still heat soaks and is semi returnless.</d=
iv><br><div class=3D"gmail_quote" dir=3D"auto"><div>I made sure I put in a =
bleed (just some very tiny part I found from a carby kit) between high &amp=
; low side of regulator mount, Allows pressure to bleed off when pump is of=
f. so pump is not under vapour pressure when trying to prime. Dont seem to =
have lost any pressure during normal ops.</div><div dir=3D"auto"><br></div>=
<div dir=3D"auto">Also have the solonoid, just in case I need to purge air =
faster from low pressure side in case I run a tank dry in flight ( 4 tanks =
so its just a matter of time).</div><div dir=3D"auto"><br></div><div dir=3D=
"auto">Andrew</div></div><span class=3D"HOEnZb"><font color=3D"#888888"><di=
v dir=3D"ltr">-- <br></div><div class=3D"m_3270240779703278701gmail_signatu=
re" data-smartmail=3D"gmail_signature">Regards
Andrew Martin
Martin Ag</div>
</font></span></blockquote></div><br></div>

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