NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Robin Stuart
Date: 2011 Mar 18, 05:21 -0700
Richard,
I don't think that the required looseness in the mylar is enough to produce ripples under reasonable conditions as a slight flapping of the mylar shouldn't lead to localized pressure points on the surface. A far more serious problem is if jets of air enter around the edges of the windows. In fact I consider this a rather serious design flaw of the Davis artificial horizon. There is a small gap left between the supports and the bottom of the windows that results in ripples for even quite modest breezes. Plugging these with tape, plasticene or the like is a significant improvement.
Robin Stuart
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