Mike Wills wrote:
 >
 > Dick,
 >
 >   My reply was to the post from "AI Nut", not to your post.

Unfortunately

 > that tidbit of info got lost somewhere along the way.
 >
 >   Regarding your seperate duct. Your installation is going into a Long

EZ

 > isnt it? If correct I'd assume that available space will be at a

premium as

 > it is in my "cheekless" RV-4 installation. I'm currently in the process

of

 > trying to fit ducts in my cowl for rad, oil cooler, and induction air.

This

 > has been some of the most time consuming and difficult work of the

whole

 > project. In a tight cowl its incredibly difficult to find space for

ducting

 > that fits and that is free of numerous bends, constrictions, etc... I'd
 > hate to have to fit another one. I wish you luck with that.
 >
 >   If the spray bar ends up being necessary for sustained climb, cruise,
 > etc.. then I agree it will be unacceptible. More work will be required
 > dialing in the basic cooling system. But for use on the ground I think

it

 > is an acceptible alternative and a better choice than the fan in a

seperate

 > duct. Cheaper, lighter, and much easier to fit. And since virtually
 > everyone that I'm aware of has struggled with initial cooling problems
 > during first flights I think everyone should consider installing

something

 > similar before their first flight just for insurance.
 >
 > Mike Wills

 The new policy around here is if you want to reply to something
 put it at the end of the existing message and not at the beginning. That
 is the standard at the ACRE NL. Yes I know your email program puts

"From:"

 and the cursor at the top. Just scroll down to the end
 of the message and place your answer or response to the now above
 existing message.

 That puts things in chronological order. If you don't do this anything
 south of your message will be deleted.

 Paul Lamar

Sorry, Mike, about missing who your previous post was directed to. I read
the other post after I had responded to yours and realized my mistake.

Unfortunately I can't go "cheekless". My pickup scoops will all be outboard
of the firewall. The cooler will run longitudinally through the wing root
area above the duct. This gives me about four inches between the main duct
and the oil pan.

Since I won't have the big fan in front, I won't have much airflow to
deliver the water spray to the radiator and cooler. My opinion is that fans
are a necessity in a pusher configuration. The choice is whether to put a
fan in the main flow and shorten its life, or find an alternative like the
side duct. As far as the fan for the water radiator, it will be behind the
rad. Since its cross section will be about 3 times that of the inlet, its
airspeed will be about a third, minus the reduction from the pressure drop
through the system. If its bearings wear out, I will just have to replace
it. That's part of the price I pay for my choice of installation. I don't
consider it a safety issue since it is only used on the ground, and my
takeoff checklist includes verification of all temperatures.

Dick Gregory

 
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