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#1
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New Mexico Fire Devils
I fly in the Reno area and I've seen big dust devils
that carry dirt into the air (starting at 4300' MSL, ground level) up to 12,000' MSL. At the ground the 'thermal' is rotating but it does not go up too far (maybe 2000' to 3000' AGL for a real strong one) before there is no perceptable rotation of the dirt in the air. At the average altitudes we fly gliders, particularly just below clouds (at least 500' below, right?), there is no special reason to be turning right as opposed to left (or vice versa) other than your initial best guess for centering purposes. JLH Ventus C |
#2
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New Mexico Fire Devils
I think the rule for dust devils is, "There ain't no hard rules." I've seen
'pipe stem' dust devils reach over 20,000' in southern New Mexico. I think there is good evidence that once rotation sets in, it continues at height but slower than near the surface. I can tell you that turning against the dust devils rotation at low altitudes works a lot better than the other way. Bill Daniels "James Hamilton" wrote in message ... I fly in the Reno area and I've seen big dust devils that carry dirt into the air (starting at 4300' MSL, ground level) up to 12,000' MSL. At the ground the 'thermal' is rotating but it does not go up too far (maybe 2000' to 3000' AGL for a real strong one) before there is no perceptable rotation of the dirt in the air. At the average altitudes we fly gliders, particularly just below clouds (at least 500' below, right?), there is no special reason to be turning right as opposed to left (or vice versa) other than your initial best guess for centering purposes. JLH Ventus C |
#3
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New Mexico Fire Devils
I've never thermaled in a dustdevil, but wouldn't rising particles hurt
the glider over time? -Nik |
#4
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New Mexico Fire Devils
I am sure the cheat grass that was hanging off the leading edge of the
wing, after I took a 9000ft climb in less than 4 minutes in one, certainly hurt the performance of the glider. Fortunatly I missed the few Garbage bags that were floating around in it as well. It did raise a few eyebrows as a rolled to a stop on the runway and the Cheat grass finally fell of the leading edge of the wing on to the Tarmac. Brian HP16T N16VP |
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