---------------------------------------------------------- Stratus-List Digest Archive --- Total Messages Posted Thu 10/07/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:29 PM - Re: Stratus EA-81 Cooling (Andrew SanClemente) ________________________________ Message 1 _____________________________________ Time: 03:29:27 PM PST US From: Andrew SanClemente Subject: RE: Stratus-List: Stratus EA-81 Cooling --> Stratus-List message posted by: Andrew SanClemente 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)" > >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 >--> > >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)" >> >>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. >== >== >== > > >_- >===================================================================== >=== >_- >===================================================================== >=== >_- >===================================================================== >=== >_- >===================================================================== >=== > >