Previous posts indicated that parallel sided ducts
are equal to diverging sided ducts up to about .70-.75
mach. Since most of us on this forum will be able to
keep well under those speeds I would like to hear more
opinions on the use of the parallel ducts.(easier to
build)

    Kell Troyer

Dyke Delta/13B Rotary Power

I have yet to see a NACA paper comparing the two. The extra work
is minimal.

Paul Lamar

Mike Wills wrote:

  I agree, the extra work is minimal. Using the Excel program that Vlad
posted  several months ago and again last week. I came up with the
appropriate data points which I plotted and smoothed in ACAD. Then cut out
a mold from a chunk of hardwood, covered with packing tape, and vacuum
bagged in carbon fiber. The whole thing took about 4 hours (not including
cure time), is strong, and weighs next to nothing.

  Looks pretty trick as well. Could probably sell a boatload to the Honda
Civic racer crowd. :-)

Mike Wills

 
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