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Message
I see you have a new cowl on order. I
was wondering exactly what configuration for cooling do you have in mind?
I presume the two evaporator core approach is just not configuration compatible
with all you need to put under the cowling. One thing, my brief experiment
with reducing the inlet size by 33% tells me, is that contouring the flow from
inlet to radiator does indeed make a significant difference in cooling
performance.
You're asking this to get revenge for my silly EDDIE
questions, aren't you :-)
The honest answer is that I don't yet know what cooling
configuration I'll use. About the only thing I've decided is that I can
use the stock cowl, and save myself the torture of having to make one from
scratch. I have probably considered every conceivable option for cooling
over the past couple weeks, and really have only a few options now.
My ideal goal would be to use the stock cowl, with as little change as
possible.
It will take 4-6 weeks to get the cowl, so I'll try to
use that time to do some cooling tests, and primarily, more turbo
evaluation. I'll really need to decide if the turbo stays, or goes before
making the next cowl.
For water, I'll either use two of the Caprice evap
cores, or a smaller Howe radiator. Oil will be cooled with my current
Setrab cooler, and an intercooler will be a bonus item, if I can fit it
in.
If the turbo goes, the best option is to use the evap
cores in the cheeks, and the oil cooler on the bottom of the engine with a small
scoop. Air, and an exhaust pipe would exit the bottom of the cowl, and I'd
put the normal cheek extensions on the fuselage to clean up the rear of the
cheeks.
If the turbo stays, I've got 2 similar
options in mind.
1a- Use a Howe radiator, with the oil cooler on top,
tucked as tightly to the bottom of the engine mount as possible, positioned at
the far aft end of the mount. Bring air in the front of the cowl
cheeks as normal, close off the rear of the cheeks, and let the air flow out
through the oil cooler and radiator. I would have to make a sort of
rear facing scoop for the bottom of the radiator, to dump the
air toward the rear, in about the normal air exit location. This
would probably be the best aerodynamic option, but of course has the
complication of sealing the cowl, and worrying that the hot air from the
turbo area will reduce the efficiency of the radiator too
much.
1b- This would be just like above, except that a scoop
would be mounted on the bottom of the cowl to bring air in, and the rear of the
cheeks would be opened for air exit. The front of the cheeks would be
ducted to the turbo intake, and maybe an intercooler. The main downside to
this option is the drag from not having the cheek extensions in place.
I would plan to make the cowl seal to the
radiator, then have a removable scoop. Doing that, I could actually try
option A first, then go to option B if cooling is a problem. The downside
of this is not having room for an exhaust pipe to exit the bottom if I ever
remove the turbo.
Now, if you actually made it this far, you're sorry you
asked right?
Rusty (too much to think
about)
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