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Thanks for your ideas. I have been experimenting for years and believe your conditions are similar to mine. We do a lot of sailplane soaring here in Western New York state. 72W 42N. I wish there was more hard data for upright bikes with the rider's back angle 45 to 55 degrees (50-60 grads) from horizontal. My observation is that the rider's torso, arms and legs form a shape similar to a pump vane or scoop. A rider with a back angle close to zero has a much different chord to length ratio and the rump has a larger radius compared to the rib cage front to back. Again observation versus hard data. So far my fairings have been for city bikes with my back angle at 55 degrees. My aero bars are homemade and I am planning to build an inexpensive triathelete style bike using a mixte steel frame to test a full body fairing. The profile will be a 1:4 inverted wing truncated 25% for kamm effect.
Front fairings have been popular more for rider protection than for drag reduction on motorcycles. Getting a leg over the seat or top tube is an issue for older riders when there is a rear fairing shoulder high. So far the best option is to have a pivot point near the head tube.
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