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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-577394@logan.com>
Subject: Re: [FlyRotary] Re: Fuel pump question.
Date: Wed, 22 Dec 2004 18:36:08 -0500
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Joe, the principal reason for using both pumps on take-off and Landing is
should one fail, the time it takes to recognize the problem, decided what
has caused it and take corrective action (turn on the other pump), precious
seconds can be lost.   Which if you are close to the ground can made a
crucial difference in the out come.   I strongly recommend running both
pumps for such critical phases of flight - you can turn one off when you
reach a comfortable altitude (or have landed).

Ed Anderson

----- Original Message -----
From: "Joe" <jewen@comporium.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, December 22, 2004 6:08 PM
Subject: [FlyRotary] Re: Fuel pump question.


> Dana,
> I do not know of a reason to use both pumps at the same time.  My thoughts
> on this subject are directed to the electrical.  If you use an single
switch
> it may have the effect of reducing redundancy.  While redundancy exists
for
> the pump the wiring will not be fully redundant.  The CB and wiring to the
> common of your switch will serve both pumps and a failure in the CB,
switch,
> or lead in wiring will render both pumps inoperative.  My current plans
call
> for 2 batteries, each pump, ECU supply, Coil supply etc. from each of the
> batteries.
> Joe
> ----- Original Message -----
> From: "Dana Overall" <bo124rs@hotmail.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Tuesday, December 21, 2004 8:39 PM
> Subject: [FlyRotary] Fuel pump question.
>
>
> > Man am I ever going to expose my serious lack of electrical knowledge
> > here:-)  I'm planning on using a single pole double throw switch to
> activate
> > one or the other fuel pump, but not both.  Is there ever any reason to
> have
> > both pumps on at the same time??
> >
> >
> >
> > Dana Overall
> > Richmond, KY i39
> > RV-7 slider, Imron black, "Black Magic"
> > Finish kit
> > 13B Rotary. Hangar flying my Dynon.
> > http://rvflying.tripod.com
> > http://rvflying.tripod.com/blackrudder.jpg
> > do not archive
> >
> >
> >
> > >>  Homepage:  http://www.flyrotary.com/
> > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
>
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html