|
|
----- Original Message ----- From: "Ernest Christley" <echristl@cisco.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, March 04, 2005 10:54 AM
Subject: [FlyRotary] Re: fuel cutoff valve necessary?
Paul wrote:
----- Original Message ----- From: "Ernest Christley" <echristl@cisco.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, March 04, 2005 9:01 AM
Subject: [FlyRotary] Re: fuel cutoff valve necessary?
>>
Paul, you're mixing two seperate things here. A maintenance shutoff valve and an emergency shutoff valve. I'm only really considering the latter.
Answer...Hi, Ernest....actually, my emergency shutoff valve is also my maintenance valve. (Dual duty).
Consider this objectively. Once the pump stopped, did turning an extra vavle actually make you safer, or did it just make you feel safer? If there was no flow through the pump without the electrons driving it, what additional benefit does the valve offer?
Answer....If the landing was not so smooth, or I couldn't stop in time and went into the ditch and the engine and mount separate from the plane, or it should flip over, etc, I would prefer the fuel went no further than the shutoff valve. Not every forced landing results in an undamaged aircraft.
One point that I should clarify, so that my ruminations here would not seem so pointless. I've been considering a returnless system. A single tank is located high in the back of the airplane. If I locate the pumps, filters and gascolator back under the tank (advantageous for W&B and positive head to the pumps), and just run the single supply line up front, then I would have to find a valve that would reliably operate under elevated pressures. But having a pump that blocks flow when it isn't running immediately begs the question of, "What is the point of the valve?" Not thinking for a moment that I know it all, I present the question here.
Answer....the fitting that attaches the fuel line to your pump leaks, or the fuel line to your pump develops a leak. How you gonna stop it? Just a thought, not necessarily a good one. Paul Conner
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
-- No virus found in this incoming message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.6.1 - Release Date: 3/4/2005
|
|