"Mike Schumann" wrote in message
nk.net...
How long of a runway do you need for an effective / safe winch and/or auto
tow launch environment?

Mike Schumann

With the old manually controlled winches and steel wire, 30 - 40% of the
runway is achievable as release height. However, there is something of a
revolution in winch technology going on right now.

The new high power, computer controlled winches using ultra light 'plastic'
UHMWPE 4.5mm cord can get up to 50% of the runway length in zero wind
conditions. Launching into a headwind increases the release height quite a
bit more. So a 5000 foot runway might get you 2500 feet AGL. That's
usually enough to contact soarable lift if there is any to be had.

Bill Daniels