On Monday, May 27, 2013 12:10:54 PM UTC-4, John Galloway wrote:

Unlike a hat brim the obstruction from the support bar is directly

at pupil level and the closeness to the eye means that even a

narrow obstruction will subtend an angle large enough to cause

a significant lateral blind spot. Most gliders on a collision

course are most likely to be level with oneself.

Excellent point.

This is a crazy

idea and to allow pilots to use it would be similar to allowing

flying with visual field defects.

M