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Date: Fri, 15 Jun 2007 11:32:24 -0400
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From: "terrence o'neill" <troneill@charter.net>
References: <list-2103542@logan.com>
Subject: Re: [LML] Re: Boost Pump
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Replying to Bill, referenced in Bob Mackey's e-mail note to Bill, below.

Bill,
I have a Dukes P/N 4140-00-15 (Cessna P/N C291504) Ser. No. 17689.  I bought 
it new and used it about 45 hours on my Model W prototype, for a  Lyc. 
IO-360-A1B, and then stored it until now.  Yours for $500., no core charge.
Placard says 35 g.p.h @ 23 psi.
 Price of rebuilts is $489. plus $400. core charge.

Terrence O'Neill
L235/320 N211AL


----- Original Message ----- 
From: "bob mackey" <n103md@yahoo.com>
To: <lml@lancaironline.net>
Sent: Thursday, June 14, 2007 09:53 PM
Subject: [LML] Re: Boost Pump


>
>> I'm looking at a Dukes pump that's rated 11.0 PSI low and 25 PSI
>> on high. Flow rate is 35 GPM @ 21.0 PSI. I don't know how this
>> compares to the pumps being used in Lancair installations, but
>> wouldn't seem that the Dukes could overload the system, especially
>> if  the engine-driven pump was inoperative.
>> If you were idling and hit the high boost, yes. At full TO power it 
>> should
>> be less than the engine-driven output. My question is: could the output 
>> of
>> the two pumps combine and overwhelm the return line causing pressure and
>> thus fuel flow to go out of limits?
>
> Bill:
> You might want to check those specs... you wrote that the
> Dukes pump is rated at 35 GPM (gallons per MINUTE)
> while the engine uses 32-36 GPH (gallons per HOUR).
>
> If you can really fill a 5 gallon can from the Dukes pump
> in 8.57 seconds, it can probably flood an IO-550.
>
> I use a system that flows 35 GPM liquid propane at about 200 psi.
> That generates a flame about 100 feet high. That kind of flow
> might be excessive even in an Lancair IV.
>
>
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