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If I got the idea right, to use the Streamline you would want to sketch the
"perfect" streamline for your radiator and then measure FROM the radiator
towards the intake - whatever length you can do, and cut it there.
That will be your intake area.....
Wedge should be simple: Whatever your opening is - constant cross-area to
the radiator - as big a radius at the bottom near end as you can justify -
same point top surface, start a tapper to the end of the radiator to end
about 1/2" above the far end and radius it down.
Which one is better? No idea!
Generally I would guess streamline, but in your case it will not be perfect,
so you might want to do some mockup from plywood/cardboard/etc. and try some
watermanometer tests/kitchenscale on the rooftop on top of your car -
tests.....
Thomas J.
PS: PL over at the "other" site was lofting both systems together, looks
good but results are anyones guess....
----- Original Message ----- From: "the mallorys" <candtmallory@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, March 13, 2006 10:25 AM
Subject: [FlyRotary] Re: finding a radiator
Dennis,
You seem to be at the same point in installation as I. I'm putting the
Renesis in an RV-8 using the James cowl. I'm trying to fit the radiator
verticaly under the engine mount. That gives me space of about 8 1/2 by
19
1/2. Make the radiator 3.75 to 4 inches thick, and I should have enough
cooling. Since I don't have about 50 inches in front of the radiator for
the perfect streamlined diffuser, the question for me is which will be
less
drag, a shorter (about 20 inches) streamline, or tipping the radiator at
an
angle and using a wedge shape diffuser? In any case, I plan on having an
exit duct also with a controllable exit.
Does anyone know the answer?
Chris
----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, March 12, 2006 10:37 PM
Subject: [FlyRotary] Re: finding a radiator
> Dennis Haverlah wrote:
>
>> My question is - will the air make the 75 degree turn and flow through
>> the fins? If not - would turning vanes below the radiator make this
>> configuration possible?
>
> Dennis, a section in K&W book discusses this very issue. The short
answer
> is "Yes". The long answer is that you have to be very careful how you
> design the duct face in front of the radiator. If you have their book,
> it's figure 12-12 on page 277.
>
> -- > This is by far the hardest lesson about freedom. It goes against
> instinct, and morality, to just sit back and watch people make
> mistakes. We want to help them, which means control them and their
> decisions, but in doing so we actually hurt them (and ourselves)."
>
>
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
--
Homepage: http://www.flyrotary.com/
Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/
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