I don't claim to be a Coro-Guru myself, but here are a few pictures of my most extensive coro project to-date - a full fairing that was designed to go around a Steintrikes Nomad trike. Merrill Gay took these photos at ElectroVelo in Scarborough, ME back in the mid-2000's.
The nose fairing shape follows an ellipse - that way you can set the nose length to anything
you want, and set the side to side width to the track width of the trike
and get a much more aero shape. There are lots of instructions on how
to draw an ellipse on line. I made a
front fairing that followed an ellipse by cutting one out of rigid foam
insulation to help me form the coro and then also bending a piece of
1/8" x 1" aluminum bar stock to the same shape. You can then drill
holes in the bar and pop rivet the coro to it to force the coro to hold
that shape. Lee Wakefield was able to get his Red Zeppelin (https://thevelonaut.blogspot.com/.../lee-wakefields-red...) fairing to hold an ellipse shape by using a horizontal coro profile (a belly band?).
On some of the inside shots, you can see the aluminum dashboard that I made, which also helps hold upper deck's shape just inside the cockpit opening.
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