In at the deep end then... the crusty old mariner that taught me coastal navigation made it pretty clear. If its got a fixed scale and a fixed north it's a map and its got no place in 'real' navigation (because you can never be sure you know how to relate a compass to it nor how to measure distance). But if it shows magnetic variation and has lats & longs so you can calculate proper distances anywhere on it, it's a map.
Plenty of other opinions, but this explanation would have kept my donkey from being keel-hauled. Cheers Brett Kettle -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Sanders Sent: Thursday, 9 March 2006 11:42 PM To: 'Discussion of issues relating to Soaring in Australia.' Subject: RE: Re[2]: [Aus-soaring] Re: [pulleylaunch] Knots? I've been a pilot for 38 years and 23,500 hours later I WOULD like to know the difference between a map and a chart??? So what is it please? Ron S -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett Kettle Sent: Thursday, 9 March 2006 8:54 PM To: 'Discussion of issues relating to Soaring in Australia.' Subject: RE: Re[2]: [Aus-soaring] Re: [pulleylaunch] Knots? Anyone who can tie a shoelace in 15 seconds can do a splice in a minute, with just a little practice, no splicing tool needed. ...and a sextant is a great way to estimate altitude of a glider from the ground; pilots who don't know the difference between a map and a chart should be keel-hauled; and a cat-o-nine tails keeps the winch retrieve driver on the ball. But plumb bobs are useless when it comes to working out your angle of bank. [working hard on becoming a cantankerous old fart] Cheers Brett Kettle -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Derry Sent: Friday, 10 March 2006 1:22 PM To: Discussion of issues relating to Soaring in Australia. Cc: [EMAIL PROTECTED] Subject: Re[2]: [Aus-soaring] Re: [pulleylaunch] Knots? If -it takes 30 seconds to tie a knot -10 minutes to do a splice -you need to carry a splicing tool -you need someone who is trained and wants to do it Why would you bother to splice...unless you used a winch and were therefore forced to do it ! KISS Keep It Simple Stupid !!!!!!!!!!!!!!!!!!!!!!!!!!! On Thu, 9 Mar 2006 16:38:44 +1300 "Brett Kettle" <[EMAIL PROTECTED]> wrote: > Why not splice it? > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Michael > Derry > Sent: Friday, 10 March 2006 5:38 AM > To: [EMAIL PROTECTED] > Cc: aus-soaring; Winchdesign Yahoogroups > Subject: [Aus-soaring] Re: [pulleylaunch] Knots? > > To: http://groups.yahoo.com/group/pulleylaunch/ > cc others > Neil > > I should have expanded a little more about knots. > > A FEATURE THAT OUR COUSINS USING WINCHES CANNOT TAKE ADVANTAGE OF > > The knots which we used that worked were reef knots. > > If you look at a reef knot, the knot sticks out one side and the two > lengths of rope line up under pressure. So when you watch a rope with a > reef knot in it go around a pulley at speed and under load the line of > the rope goes right against the pulley and the reef knot sticks out to > the side. > > After watching knots go around pulleys many times under load I was > amazed to see that the line of the rope always went against the pulley > and the knot was on the opposite side. > > Reef knots slip easily so we tied a knot at the end of each peice of > rope to stop it slipping. This worked a treat. > > A knot savy pilot saw a reef knot we had tied before a launch and > replaced it with some other superior knot in terms of strength. > Unfortunately when the knot went through the pulley it snapped. The > reason it snapped was that the two lengths of rope did not line up when > under pressure and the knot did not stick out to the side. The knot was > on the inside of one of the pieces of rope and acted as a fulcrum > placing much stress on the rope at the edge of the knot. > > Has anyone eany other thoughts about knots.....it is a big subject ? > > Regards > > Michael Derry > > "Neil Wolthers" <[EMAIL PROTECTED]> wrote: > > http://groups.yahoo.com/group/pulleylaunch/ > > > Is there any particular reason you guys are using knots in the rope? > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > _______________________________________________ > Aus-soaring mailing list > Aus-soaring@lists.internode.on.net > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring __________ NOD32 1.1435 (20060308) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list Aus-soaring@lists.internode.on.net To check or change subscription details, visit: http://lists.internode.on.net/mailman/listinfo/aus-soaring
