On Wed, 07 Oct 2009 19:38:36 -0700, Papa3 wrote:


The geometry prevents you from having a very "flat" triangle where you
basically fly along the ridge and bounce out a few miles to make a
triangle with one very LOOONG leg and two other legs that are only half
as long. SeeYou or other preflight planning software actually show you
how to lay out a triangle that meets these criteria.

IME it can be quite flat. By way of concrete example of a permissible
long, skinny triangle, I got Diamond Goal and Gold Distance on GRL-BSE-
EDG-GRL in 2004, which counts as an 18.9% triangle. GRL is the apex of
the triangle with BSE-EDG forming the base. Flatness: the base-apex
distance is 0.24 km. For those who don't fly in the UK, GRL is Gransden
Lodge, my home field, BSE is Bury St Edmunds and EDG is Edgehill. If
you're curious about the geometry, the whole story including maps, is
he

http://www.gregorie.org/gliding/300km/040625.html

Since this was acceptable in 2004, has the definition of an acceptable
triangle changed since?


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |