In message , Bob
Kuykendall writes
Earlier, Martin Gregorie wrote:

My ASW-20 is fitted with a fin mounted Irving-type TE probe except
that it only has a single hole in place of the usual two holes. What
advantages would there be to swapping it for a two-hole version?

This might be a bit of pedantry, but I believe that the one-hole probe
is generally what you'd call a "Nicks tube," for the late Oran Nicks
who developed the theory and practice of this simple yet relatively
effective TE probe design. And I think that the one with the slot or
two is generally a "Braunschweig tube." I don't know the name for the
two-hole probe design.

Here's an article by Dick Johnson on how he further developed and
validated a Nicks-pattern probe design and location for the PW-5:

http://www.ssa.org/Johnson/89-1998-04.pdf

Couldn't get this to down load. Can someone who can post it to me?

Regards

Robin
That article cites Nicks' earlier (1976 and 1977) _Soaring_ articles
on TE probe design.

Elsewhere in this thread I've already posted a link to an article on
thge Les Sebald innovation of using a Nicks TE probe as a radio
antenna.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24

--
Robin Birch