On Thu, 12 Aug 2004 at 11:01:06 in message
, Corky Scott
wrote:
The designer of the prop I mentioned wrote in the article about the
fallacy of single bladed prop. Regardless the dubius advantage of
biting into clean air, the problems associated with the unbalanced
thrust produced by the single blade spinning around, despite it being
counter balanced weightwise, are for all practical purposes
insurmountable.

This is successfully been done at model scale, where the effective
diameter is more important and High Mach numbers are not used. This is
especially true of rubber powered models where the high torque needs a
large diameter slow turning airscrew. The mass balance is angled
backwards so the offset thrust can be, to some extent, be balanced.
--
David CL Francis