|
I could be wrong but I think the idea is to
get the opening away from the hub area as all it creates is a turbulence and
blanketing effect.
The minimization of the flat plate area dictates
that you can't take it too far from the hub area because of increased
drag, created because of a bigger frontal area.
However just past the hub you get better flow -
however the area between the flange/ hub area and the rad inlet needs to be
streamlined - hence the concave recess between
the two, which allows the air to flow smoothly rearwards.
The boundary layer is more of a concern as you move
backwards along the cowl and the fuselage.
George ( down under)
Ernest Wrote:
> You should have went with your first
instinct in my opinion. Like you said,
> the boundary layer at
that point does not exist in any measurable thickness,
> and your going
to get increased drag from the vortices created in the
> intersecting
surfaces.
Something more like this? [JJJ
RV10-COWL Rev 5] I'm not sure I
like this look totally either but it might improve the airflow a bit. I guess
the other option would be to put a center 'divider' something like this
[JJJ-RV10-COWL Rev4 & JJJ-RV10-COWL Rev
4-FULL VIEW] to get things better streamlined, but it actually
may increase the problem due to rotational flow off the prop.
Jarrett Johnson
>> Homepage:
http://www.flyrotary.com/
>> Archive:
http://lancaironline.net/lists/flyrotary/List.html
|