On Feb 2, 9:40*am, Frank Whiteley wrote:
On Feb 2, 9:33*am, bildan wrote:



On Feb 2, 7:59*am, Jim wrote:

On Feb 1, 8:32*am, GARY BOGGS wrote:

When are we going to quit loosing sailplanes to poor tie downs?

http://bit.ly/cgioFc

Last year my super cub's left wing and struts were destroyed in a wind
storm,
the double tiedowns held the airplane in place for the wind to twist
the wing.

Would have been nice if it had been in the hangar but then a lot of
very nice
gliders were lost in the Barstow hangar fire a while ago.

Jim

There's a lot to be learned from the experience at Boulder, CO where
high-wind events often exceed 100 MPH for many hours.

The technique is 6 deeply buried concrete tie down anchors per glider
- nose, tail and two on each wing - one inboard and one outboard. *On
flex-winged composite gliders, wing stands are used. *The gliders are
oriented 90 degrees to the high-wind direction.

Ropes are at least 1/2" (13mm) high-strength climbing ropes or nylon
straps. *The knots are multiple half hitches drawn up tight against
the glider. *These knots are so simple anyone can tie them with one
demonstration - and they'll come loose when you want them to. *As long
as there is no slack, they won't work loose on their own.

I believe the slats inserted into the cyclone fencing surrounding the
Boulder parking bays has also paid an important part.

Yeah, the cyclone fencing helps a lot. They strain out flying debris
and slow the wind a bit. I've been out there when wind borne golf
ball sized rocks were hitting me at knee level.