C Smith,       It seems to me the intent of the contest was to see what we
can do with the various software brands we are learning. I have only used
Rhino for 3 weeks and found the cowl took over three hours to figure how to
get it where I wanted it to be. I did some intake ports for a rotary engine
and some side housings previously which have a lot of sharp edges and draft
which seemed harder at the time due to the required precision but it was a
head start on this project.

Already I am sure I will never go back to
triangles and a T square. It will be interesting to see what you and Jean
Prudome come up with using  Alibre CAD. The Solidworks users all seem to
have a lot of experience so if they can't easily beat a couple of novices
what does that say about the learning curve of their software.

    I have read that some people find making up a cowl plug is difficult
so possibly somebody will like one of the designs and get some use out of
it.Also by baseing it on the provided pictures it looks like something for a
Jabiru or 912 which some people expect an airplane to look like.That is a
nice trick  and useful to hide a 250 HP p-port in plain sight.Of course a
20B would make more HP than that, probably enough to do something stupid
with.

george grimes