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#1
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Buoyancy/Shear Ratio
What do you think about the BLIPMAP Buoyancy/Shear Ratio parameter?
Is it accurate that less than 7 makes the day difficult to work? I have found lately that this seems to be true but my sample size is small. I am in the northeast US. Location is probably a factor. |
#2
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Buoyancy/Shear Ratio
I had heard 5 was where it started to get tough. I have gone cross country on days with the forecast of 2. Not easy, but if cross country was easy, any monkey could do it! I would not pass on a day just because the forecast B/S ratio is low. I have had fairly smooth thermal climbs with winds of 35 to 40 MPH here in the midwest. I have also had very rough and broken climbs with winds less than 10 MPH.
Steve Leonard Wichita, KS |
#3
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Buoyancy/Shear Ratio
Usually accurate but like Steve I've had good thermals on days with very low B/S, like when I flew 525 miles in a 30-40mph tailwind
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#4
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Buoyancy/Shear Ratio
On Saturday, August 1, 2015 at 10:55:32 AM UTC-4, Soartech wrote:
What do you think about the BLIPMAP Buoyancy/Shear Ratio parameter? Is it accurate that less than 7 makes the day difficult to work? I have found lately that this seems to be true but my sample size is small. I am in the northeast US. Location is probably a factor. The best thermals on any given day have better buoyancy, so better B/S ratio. Days with a lot of shear put an absolute premium on thermal selection. I'd put the number where things start getting choppy at around 5. -Evan Ludeman / T8 |
#5
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Buoyancy/Shear Ratio
Agree with Evan and Steve above. A lot depends on your course selection as well. Crosswind legs on low B/S ratio day can be brutal. Upwind/downwind usually better. Also depends a lot on pilot thermaling ability. Low B/S days typically require "dynamic" thermalling (push/pull/stomp - whatever it takes to go up).
P3 On Saturday, August 1, 2015 at 11:50:46 AM UTC-4, Tango Eight wrote: On Saturday, August 1, 2015 at 10:55:32 AM UTC-4, Soartech wrote: What do you think about the BLIPMAP Buoyancy/Shear Ratio parameter? Is it accurate that less than 7 makes the day difficult to work? I have found lately that this seems to be true but my sample size is small. I am in the northeast US. Location is probably a factor. The best thermals on any given day have better buoyancy, so better B/S ratio. Days with a lot of shear put an absolute premium on thermal selection. I'd put the number where things start getting choppy at around 5. -Evan Ludeman / T8 |
#6
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Buoyancy/Shear Ratio
Agree with all the comments above. In general windy blue days are more difficult. I normally don't check the B/S ratio as the BLtop, wind, cu potential and cu base (as well as convergence and total cloud cover) provide sufficient information.
Ramy |
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