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1. 03:29 PM - Re: Stratus EA-81 Cooling (Andrew SanClemente)
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| Subject: | Stratus EA-81 Cooling |
--> Stratus-List message posted by: Andrew SanClemente <ansancle@townisp.com>
So now you tell me I could have saved all that time - money - and
aggravation on setting up the Andair selector!! I like your setup,
nice clean and simple.
On Wed, 6 Oct 2004 16:44:11 -0700, Hinde, Frank George (Corvallis)
wrote:
>--> 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
>To: stratus-list@matronics.com
>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
>
>
>==
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>==
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>
>
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