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#1
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Andy,
Your 50:1 math is right and wrong at the same time. What is missing is the fact the the centre of the 3 km finish cylinder is located at the opposite end of the 4000 ft landing runway. This means that when you cross the finish line at about 200 ft agl you are about 1.8 km from the touchdown point (and 3 km from the other end of the runway). This gives L/D of 30:1 to touchdown which is sufficient for the ships flying in the 15/18/ Open Classes. |
#2
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On Aug 2, 7:43*pm, Dave Springford wrote:
Andy, Your 50:1 math is right and wrong at the same time. *What is missing is the fact the the centre of the 3 km finish cylinder is located at the opposite end of the 4000 ft landing runway. *This means that when you cross the finish line at about 200 ft agl you are about 1.8 km from the touchdown point (and 3 km from the other end of the runway). This gives L/D of 30:1 to touchdown which is sufficient for the ships flying in the 15/18/ Open Classes. .... and also add that the glider will probably be flying faster when reaching the finish ring, so will have a bit more energy to spare or if it doesn't, it can land short if necessary |
#3
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On Aug 2, 11:43*am, Dave Springford wrote:
Andy, Your 50:1 math is right and wrong at the same time. *What is missing is the fact the the centre of the 3 km finish cylinder is located at the opposite end of the 4000 ft landing runway. *This means that when you cross the finish line at about 200 ft agl you are about 1.8 km from the touchdown point (and 3 km from the other end of the runway). This gives L/D of 30:1 to touchdown which is sufficient for the ships flying in the 15/18/ Open Classes. Thanks for the correction Dave. I went back and looked at the last 3 days task sheets and now see that when 16 is the landing runway then Szeged34 is the finish centre, and when 36 is active Szeged16 defines the centre. I had missed that. Andy (GY) |
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