30:1 is roughly 10 km per 1000'. Done plenty of final glides in the boomerang where this works. Nothing hard about those mixed units.
Useful numbers for higher performance too. Just go faster. We are not going to change it so not worth worrying about really. Cath Sent from my iPhone On 21/10/2012, at 10:20 AM, Mike Borgelt <mborg...@borgeltinstruments.com> wrote: > At 09:29 AM 21/10/2012, you wrote: >> Content-Type: multipart/alternative; >> boundary="----=_NextPart_000_0046_01CDAF76.EA2A39D0" >> Content-Language: en-us >> >> While I can agree �meters per second� does not help, many other aspects of >> the metric system would make life so much simpler. >> > > OTOH, 30:1 is 200 feet per nautical mile, 40:1 is 150 feet per nautical mile, > 20:1 is 300 feet per nautical mile. Or work various glide angles in > miles/thousand feet. It makes more sense to use nautical miles and then we're > like the rest of western world aviation. It is the damn kilometers that have > no place here although if you remember 33:1 is 100 feet per kilometer > (10km/thousand feet)that's a safe glide angle that most modern sailplanes > will achieve even in a moderate headwind. > > Anyway, before electronic glide computers we used circular slide rules not > mental arithmetic. Nowadays the units don't matter as the little glide bar > goes below the glider symbol and you can go home. If you have one start point > and a fixed task you don't even need to do more than take off, follow the big > arrow (it swings around at the turns) and wait until the glide bar goes under > the glider symbol. Then TPTB invented AAT and multiple start points which > stuffs things up completely and demands lots of pilot interaction with the > glide computer in the air. > > Mike > > Borgelt Instruments - design & manufacture of quality soaring instrumentation > since 1978 > www.borgeltinstruments.com > tel: 07 4635 5784 overseas: int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > 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
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