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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-948648@logan.com>
Subject: Re: [FlyRotary] Fuel pump theory
Date: Wed, 18 May 2005 12:58:29 -0400
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Yes, its a very sad event for all of us.  Paul was a great guy.

I agree with Al that you want your EFI pumps as low as possible in the 
system (mine are at the bottom of the firewall) for the reasons he 
mentioned.  However, like Al I am not certain this was a factor.  Until more 
information is available, all is speculation in any case - could be one of 
those unsuspected problems completely unrelated to the fuel system.  In the 
worst case, we may never know.

Thanks for converting it to text

Ed
----- Original Message ----- 
From: "Perry Mick" <pjmick@mail.viclink.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, May 18, 2005 10:24 AM
Subject: [FlyRotary] Fuel pump theory


> Sorry Ed, I'm doing this through web email, this is something Al Wick 
> posted
> to the Cozy group:
>
> This news is so sad.
>
> I want to advance this warning in case there are others with similar
> installation:
>
> I just glanced at the pic of construction of Pauls aircraft. Looks like
> he had his fuel pumps mid firewall. This is not good. You need fuel pumps
> as low on firewall as possible. This maximizes head pressure on fuel pump
> inlet. Or putting it another way, it reduces your risk of vapor lock due
> to inlet pressure drop. In addition, you want one fuel pump with no inlet
> filtering, no fuel metering device. Both which increase pressure drop at
> inlet. And most important, you want to measure the inlet pressure before
> doing any flying. This will provide a number you can use to actually
> measure your risk of vapor lock. Better yet, place fuel pump inside fuel
> tank, then you have zero risk of vapor lock.
>
> So I'm not saying this is the cause of his crash. I'm just warning others
> of a substantial risk issue and how easy it is to overlook contributing
> factors. I just hope fuel exhaustion was not a cause, it would bother me
> a great deal. It already bothers me a great deal. He seemed like a great
> guy.
>
>
> -al wick
> Artificial intelligence in cockpit, Cozy IV powered by stock Subaru 2.5
> N9032U 200+ hours on engine/airframe from Portland, Oregon
> Prop construct, Subaru install, Risk assessment, Glass panel design info:
> http://www.maddyhome.com/canardpages/pages/alwick/index.html
>
>
>
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