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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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