Today's Message Index:
----------------------
1. 04:33 PM - Re: Stratus EA-81 Cooling (Andrew SanClemente)
2. 04:44 PM - Re: Stratus EA-81 Cooling (Hinde, Frank George (Corvallis))
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Stratus EA-81 Cooling |
--> Stratus-List message posted by: Andrew SanClemente <ansancle@townisp.com>
Frank,
I don't have a header, just the wing tanks. Currently the setup is
a pump at each wing tank, and an additional inline pump on the
firewall (Boost Pump).
Only one tank is active at a time via an Andor selector and there is
a separate pump switch for each tank and a third switch for the boost
pump.
Im glad to hear its not completely messed up since my airworthiness
inspection is most likely going to be next week and Id hate to be
re-plumbing my entire fuel system!
Should I run the "boost" (firewall) pump on takeoff and landing or is
just the one wing tank pump sufficient even though its at the bottom
end of the allowable fuel pressure range? What exactly happens when
the fuel pressure is too high at the carbs?
Thanks for the information and feedback!
-Andy
On Tue, 5 Oct 2004 14:59:27 -0700, Hinde, Frank George (Corvallis)
wrote:
>--> Stratus-List message posted by: "Hinde, Frank George
>(Corvallis)" <frank.hinde@hp.com>
>
>Actually for some reason I thought you only had wing
tanks...probably
>been so long since I been flying with wing tanks only that I
complety
>forgot about the header tank.
>
>Secondly I had assumed from your description that you only had two
>pumps...One on the firewall and one for both wing tanks.
>
>If you have a header the problem goes away because there is always
>positive head over the firewall pump.
>
>If you have THREE pumps (one at the outlet of each tank and one on
>the
>firewall) and no header tank the problem also goes away...Except
that
>the firewall pump is a third level of protection (and designing to
>this
>level is overkill) and the fuel pressure will go too high when two
or
>three pumps are run.
>
>Personally I would remove the firewall pump if you don't have the
>header.
>
>The important thing here is to NOT suck on the fuel and have a
>redundant
>pump that will also not suck on the fuel.....One pump at the outlet
>of
>each tank is fine.
>
>Also make sure each pump is fed from a separate electrical source (I
>have two electrically isolated batteries, one ignition and one pump
>fed
>from each battery)
>
>Hope that helps
>
>Frank
>
Frank,
I don't have a header, just the wing tanks. Currently the setup is a pump at
each wing tank, and an additional inline pump on the firewall (Boost Pump).
Only one tank is active at a time via an Andor selector and there is a separate
pump switch for each tank and a third switch for the boost pump.
Im glad to hear its not completely messed up since my airworthiness inspection
is most likely going to be next week and Id hate to be re-plumbing my entire
fuel system!
Should I run the boost (firewall) pump on takeoff and landing or is just the
one wing tank pump sufficient even though its at the bottom end of the allowable
fuel pressure range? What exactly happens when the fuel pressure is too high
at the carbs?
Thanks for the information and feedback!
-Andy
On Tue, 5 Oct 2004 14:59:27 -0700, Hinde, Frank George (Corvallis) wrote:
--=A0Stratus-List message posted by: Hinde, Frank George
(Corvallis) frank.hinde@hp.com
Actually for some reason I thought you only had wing tanks...probably
been so long since I been flying with wing tanks only that I complety
forgot about the header tank.
Secondly I had assumed from your description that you only had two
pumps...One on the firewall and one for both wing tanks.
If you have a header the problem goes away because there is always
positive head over the firewall pump.
If you have THREE pumps (one at the outlet of each tank and one on
the
firewall) and no header tank the problem also goes away...Except that
the firewall pump is a third level of protection (and designing to
this
level is overkill) and the fuel pressure will go too high when two or
three pumps are run.
Personally I would remove the firewall pump if you don't have the
header.
The important thing here is to NOT suck on the fuel and have a
redundant
pump that will also not suck on the fuel.....One pump at the outlet
of
each tank is fine.
Also make sure each pump is fed from a separate electrical source (I
have two electrically isolated batteries, one ignition and one pump
fed
from each battery)
Hope that helps
Frank
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Stratus EA-81 Cooling |
--> Stratus-List message posted by: "Hinde, Frank George (Corvallis)" <frank.hinde@hp.com>
If you use the 106 pump (not the 105) it will give you about 3.5psi at
full power which is just fine. The boost pump makes way too much
pressure and does nothing to avoid vapour lock.
The Andair selector is redundant and unnecessary...just switch pumps to
switch tanks...sooner of later you will get confused which pump goes
with which valve position.
I just have an on/off valve (for impending crashes) and non return
valves on the discharge of the pumps (I also have a filter for each pump
here) so the contents of one tank don't end up in the other.
Run both wing tank pumps on take off. Because the pumps are in parallel
they will not double the pressure like what is happening now.
Too much pressure means eventually you will flood the carbs because the
fuel pressure will overcome the float valve...Maybe not now but in time
this could happen.
If you remove the boost pump you will also remove some pressure drop
which will bring your pressure up a bit at the carbs Run both on takeoff
and you will also get another 1 psi or so.
I never rely on just one pump on take off.
Frank
-----Original Message-----
From: owner-stratus-list-server@matronics.com
[mailto:owner-stratus-list-server@matronics.com] On Behalf Of Andrew
SanClemente
Subject: RE: Stratus-List: Stratus EA-81 Cooling
--> Stratus-List message posted by: Andrew SanClemente
--> <ansancle@townisp.com>
Frank,
I don't have a header, just the wing tanks. Currently the setup is
a pump at each wing tank, and an additional inline pump on the
firewall (Boost Pump).
Only one tank is active at a time via an Andor selector and there is
a separate pump switch for each tank and a third switch for the boost
pump.
Im glad to hear its not completely messed up since my airworthiness
inspection is most likely going to be next week and Id hate to be
re-plumbing my entire fuel system!
Should I run the "boost" (firewall) pump on takeoff and landing or is
just the one wing tank pump sufficient even though its at the bottom
end of the allowable fuel pressure range? What exactly happens when
the fuel pressure is too high at the carbs?
Thanks for the information and feedback!
-Andy
On Tue, 5 Oct 2004 14:59:27 -0700, Hinde, Frank George (Corvallis)
wrote:
>--> Stratus-List message posted by: "Hinde, Frank George
>(Corvallis)" <frank.hinde@hp.com>
>
>Actually for some reason I thought you only had wing
tanks...probably
>been so long since I been flying with wing tanks only that I
complety
>forgot about the header tank.
>
>Secondly I had assumed from your description that you only had two
>pumps...One on the firewall and one for both wing tanks.
>
>If you have a header the problem goes away because there is always
>positive head over the firewall pump.
>
>If you have THREE pumps (one at the outlet of each tank and one on the
>firewall) and no header tank the problem also goes away...Except
that
>the firewall pump is a third level of protection (and designing to this
>level is overkill) and the fuel pressure will go too high when two
or
>three pumps are run.
>
>Personally I would remove the firewall pump if you don't have the
>header.
>
>The important thing here is to NOT suck on the fuel and have a
>redundant pump that will also not suck on the fuel.....One pump at the
>outlet of
>each tank is fine.
>
>Also make sure each pump is fed from a separate electrical source (I
>have two electrically isolated batteries, one ignition and one pump fed
>from each battery)
>
>Hope that helps
>
>Frank
>
Frank,
I don't have a header, just the wing tanks. Currently the setup is a
pump at each wing tank, and an additional inline pump on the firewall
(Boost Pump).
Only one tank is active at a time via an Andor selector and there is a
separate pump switch for each tank and a third switch for the boost
pump.
Im glad to hear its not completely messed up since my airworthiness
inspection is most likely going to be next week and Id hate to be
re-plumbing my entire fuel system!
Should I run the boost (firewall) pump on takeoff and landing or is
just the one wing tank pump sufficient even though its at the bottom end
of the allowable fuel pressure range? What exactly happens when the fuel
pressure is too high at the carbs?
Thanks for the information and feedback!
-Andy
On Tue, 5 Oct 2004 14:59:27 -0700, Hinde, Frank George (Corvallis)
wrote: --=A0Stratus-List message posted by: Hinde, Frank George
(Corvallis) frank.hinde@hp.com
Actually for some reason I thought you only had wing tanks...probably
been so long since I been flying with wing tanks only that I complety
forgot about the header tank.
Secondly I had assumed from your description that you only had two
pumps...One on the firewall and one for both wing tanks.
If you have a header the problem goes away because there is always
positive head over the firewall pump.
If you have THREE pumps (one at the outlet of each tank and one on the
firewall) and no header tank the problem also goes away...Except that
the firewall pump is a third level of protection (and designing to this
level is overkill) and the fuel pressure will go too high when two or
three pumps are run.
Personally I would remove the firewall pump if you don't have the
header.
The important thing here is to NOT suck on the fuel and have a
redundant pump that will also not suck on the fuel.....One pump at the
outlet of each tank is fine.
Also make sure each pump is fed from a separate electrical source (I
have two electrically isolated batteries, one ignition and one pump fed
from each battery)
Hope that helps
Frank
==
direct advertising on the Matronics Forums.
==
==
==
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|