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        Discussion thermalling next to lake...

#1 Manonthegrassyknoll Sep 28, 2012 04:25 PM

thermalling next to lake...
 
I live and fly within 1/4mile of a large lake, (Windermere, Cumbria, UK). I was wondering because I fly on the east side of the lake and the prevailing is nearly always a westerly could this affect the thermal forming capabilities.. I regularly witness a "blue-hole" above me while all around there is Cumulus, am I in a sink hole..? I don't have any trouble finding thermals to ride but I was wondering if I would have more luck if I flew somewhere else away from the effect of the lake if such a thing exists..? Just wondering, part of the learning curve and all that..:popcorn:

Chris..

#2 wlm Sep 28, 2012 05:42 PM

Good Question. We fly on the southwest side of a large lake in Texas. (Lake Lewisville) About
1/4 mile from the shore. When the wind is from the northeast blowing across the water it seems that it is more difficult to find lift in the northeast direction. Bill

#3 schrederman Sep 28, 2012 06:22 PM

We avoid the downwind areas around lakes when flying full-scale because of what we call the lake-shadow effect...

#4 knormang Sep 28, 2012 06:25 PM

Lake effect
 
Our glider field(park) is due south of Skaha Lake by about 5 blocks, and we have found the same problem. Our winds a mainly from the north, and we have found that flying to the west or east of the park is more likely to lead to lifty conditions. The air above the lakes on a hot day is usually cooler descending air, and this air mass is drifting downwind over the park in a continuos 'river of air'(to quote Dave Thornburg). Ken.

#5 knormang Sep 28, 2012 06:27 PM

Lake effect
 
Our glider field(park) is due south of Skaha Lake by about 5 blocks, and we have found the same problem. Our winds a mainly from the north, and we have found that flying to the west or east of the park is more likely to lead to lifty conditions. The air above the lakes on a hot day is usually cooler descending air, and this air mass is drifting downwind over the park in a continuous 'river of air'(to quote Dave Thornburg). Ken.

#6 lincoln Sep 29, 2012 11:08 PM

If the shore is steep you might be able to slope soar it.

Maybe you're right about the blue hole, but I've flown off a frozen lake and caught thermals. Not a large lake, though.

#7 Manonthegrassyknoll Sep 30, 2012 02:53 AM

Thanks for the replys guys, I thought there was something in it.. I'll try some different sites.. wish it did have some steep sides or even a nice little kick on the shore but unfortunately it's mostly tree lined..

Chris..

#8 lincoln Oct 01, 2012 12:00 AM

You can slope soar a line of trees, if they are close together. I do it fairly often at our field, but it must be much better with the wind coming off a big lake. Sometimes you can stay up that way until you catch a thermal coming through, though that may not happen so much with a lake upwind.


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