Subject: Q2 Cooling
From: rotaryeng
Date: 6/22/2013, 4:43 PM
To: AAA-rotaryeng


Throttle body inlet on right. Bent radiator. Exhaust and belly
board. Radiator partially welded together. I think it could fit
here pretty well. That's my youngest daughter, Anna.


Lewis

She is very cute :)

OK I think we can get this to work. Plumb the rads in parallel if
possible. What are the dimensions for the rads?



Paul Lamar



Rads are 8.5 x 13 x 1.5 each. Welded joint is a common tank.
Plumbing in one end, through first core, the joint tank and into
the next core. Might be possible to come into central tank, then
flow outward to end tanks, and rejoin plumbing back into the pump,
but that is quite a bit more complicated. Hoping to treat it as
one big, but bent, radiator.

I like the drawing. How much depth would be needed for wedge
opening?

Lewis


Here is a more accurate dwg based on the actual size of the cores.
They are a bit on the marginal size so you are going to need a
very effective cowl flap. Don't worry about the drag as take off
and climb out happens at a speed were induced drag is high and you
won't notice any climb deterioration with the cooling cowl flap
open or closed. You will notice a strong cooling effect however. As
long as you don't have an open hole pumping air into the cowl. The
idea is to raise the pressure across the cores as high as
possible.

Start with 3 inches. You can always block some of it off if you
don't need it.


Paul Lamar


It's possible I could mount the rads in a more vertical position,
say near 45 degrees to line of flight. Any advantage there?

Lewis

That would give you a bit of room for an oil cooler. Not stock RX7.
I think that may be a bit too long at 24 inches. Something more
square.

Paul Lamar

Its weird I've just been looking over the various Rutan designs
this past week, I like the Quickie/Q2 but had dismissed it due to
believing a rotary wouldn't fit...now this comes along, BINGO! Nice
work so far sir, LOVE it! Dan


Got the book, Paul. Thanks.

Lewis.



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