Too Late, Bobby, I calculated based on a 19" width {:>)
I have sent the coordinate graphs to your e
mail as they are a tad larger than Marv permits. I had to embed
them in a MS word document - tried converting to jpeg with PaintBrush
but it didn't work out.
So the one with Height data is looking at the
duct from the side (assuming the core is mounted with the core face
perpendicular to the direction of flight). The Width data is
looking at the duct from top/bottom. So if you shaped a foam core
to these coordinates and then rounded the edges to smooth corners, this
should give you a good duct for your core.
Things come together at the inlet around 8-9"
with a 10" wide opening and a 3" wide opening - for cosmetic reasons
you could make the opening slightly wider and height slightly less just
so they give you an opening around 30 sq inches. So that
looks like about 1.5" above/below center line for a 3" total and 5"
left/right of center line for a 10" width at about 8-10" out from the
core.
The streamline duct is to be preferred over my
Pinched duct where possible, but once you start getting shorter than
about 6" the truncated Streamline duct starts to show a lot of the core
to the airstream and it is my opinion the drag goes up
considerably. The pinched duct is basically a compromise duct for
those with very short 3-6" duct runner space.
Hope this helps.
Ed
----- Original Message -----
Sent: Monday, July 16, 2007 5:26 PM
Subject: [FlyRotary] Re: Oil cooler duct.
Ed,
My notes say 18".
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net
] On Behalf Of Ed Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler duct.
Hi Bobby,
You actually have sufficient distance to
probably come pretty close to a streamline duct. Tell me
how wide the core you may use from Ed - the same 19" as the stock or
different? I'll see what I can come up with.
Ed
----- Original Message -----
Sent: Monday, July 16, 2007 3:30 PM
Subject: [FlyRotary] Oil cooler duct.
Ed,
It looks like I have about 10-12
inches of duct between the chin scoop and oil cooler face. The cooler
is a stock mazda but I am considering a slightly larger one that Ed K.
makes. 6.5" tall vs 5" Any suggestions on how you would shape this
duct using the pinched duct approach?
Thanks.... Bobby
----- Original Message -----
Sent: Monday, July 16, 2007 5:26 PM
Subject: [FlyRotary] Re: Oil cooler duct.
Ed,
My notes say 18".
Bobby
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net
] On Behalf Of Ed Anderson
Sent: Monday, July 16, 2007 1:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oil cooler duct.
Hi Bobby,
You actually have sufficient distance to
probably come pretty close to a streamline duct. Tell me
how wide the core you may use from Ed - the same 19" as the stock or
different? I'll see what I can come up with.
Ed
----- Original Message -----
Sent: Monday, July 16, 2007 3:30 PM
Subject: [FlyRotary] Oil cooler duct.
Ed,
It looks like I have about 10-12
inches of duct between the chin scoop and oil cooler face. The cooler
is a stock mazda but I am considering a slightly larger one that Ed K.
makes. 6.5" tall vs 5" Any suggestions on how you would shape this
duct using the pinched duct approach?
Thanks.... Bobby
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