Type of glider: Ventus cM 17,6m,

Takeoff location:Menomonie Municipal- (US / 7)


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Flight details

Points for the flight 36.75
scoring distance 102.22 km
Speed 40.89 km/h
Duration 01:46:52
Scoring class 18m
Scoring start 19:57:39
Scoring end 21:54:54
Index: 115.0
Club None
Date of claim 28.09.2017 02:33:03
state IGC-File: Flight:

Flight path

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TopMeteo - Weather Charts

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Winds on the ground at takeoff 290 degrees at 10 kt; winds in the boundary layer estimated 310 at 17 kt.
A cold front passed yesterday, and the overcast disc of clouds behind it caused the morning to be overcast with bases about 2000 ft agl and gusts to 17 kt.
I was delayed by work (of course) and didn't launch until almost 3 pm.
The clouds were in rows, and there looked to be short streets at takeoff. I gave myself a generous (2000-ft) self-launch because the lift seemed lazy, and though I flew up a street-like cloud, there was nothing workable, and I had to fly back to land (No, I'm *not* going to relight the engine! It's a *glider*!)
Back home, north boundary of the airfield, over the freeway, a bump.
I turned, centered, went up a bit. I figured I'd at least have a holding pattern to delay the inevitable.
Then the thermal strengthened a bit, got some shape.
I looked toward the inside the turn -- there were two hawks turning with me; very shallow angle of bank, I must say. So I felt encouraged. They have such good judgment!
After a couple of turns with them, I looked up -- there was an uncountable flock of hawks in a 1500-foot gaggle in a loose column above me. I suppose there were about 20 -- they were uncountable because I was too busy turning to keep them continually in my sights...
Since this seemed to be the only thermal God made in my area, I decided to stick with it until the hawks got bored and went away. At 4500 msl I was near cloudbase, and went exploring. I didn't find anything at first, but then bumped into another thermal that marked a line of clouds that turned out to be a street. I followed that upwind to its end, then turned and explored under a big cloud to see whether it was alive or dying. Then I flew back to my street and along it until it looked as though I could jump southwest, to see whether the neighboring line of clouds was streeting.
During this time, I discovered that the best lift was on the sunny side of the street (the upwind side with respect to the wind direction in the friction layer). This is a pretty reliable rule on thermals under small clouds and narrow streets.

With my late start, and having been to busy to fly most of the summer, an the weather out of sync with my time off, there had been no soaring after 4 june -- so this was really just a practice flight.

I am thinking that with the expected poor soaring weather, maybe I should trailer over to MN and practice aerotows.


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