Type of glider: Ventus cM 17,6m,

Takeoff location:Menomonie Municipal- (US / 7)


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Flight details

Points for the flight 217.44
Points for the flight 172.05
scoring distance 197.9
Speed 62.5 km/h
Duration 03:09:58
Points for the flight 45.39
scoring distance 174.0 km
Speed 54.8 km/h
Duration 03:10:27
Scoring class 18m
Scoring start 18:43:18
Scoring end 21:53:45
Index: 115.0
Club None
Date of claim 29.04.2018 03:18:08
state IGC-File: Flight:

Flight path

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TopMeteo - Weather Charts

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This was the first flight and precisely 6 months. The BLIPmap forecast looked encouraging, and SkySight.io deceptively forecast streeting throughout Western Wisconsin for the day.

It was pretty cold but I got to the airport at 9:30 this morning, with a brisk north wind, and many small cu in the West that gave false hope for markers later in the day.

The best thermal in the area is always over our airport. When I first started flying this glider, I flew it every possible day, no matter how weak the weather.
Many times, I was able to climb in a thermal over or near our airport and would set out first in one direction and then another and spend the afternoon in a futile attempt to get away toward each point of the compass.

Today I use the engine 0.7hr, a 2000 foot tow. The house thermal, once it was organized, hit 10 kn to 6000 MSL.

The winds on the ground were fairly brisk out of the north, and at the end of the day I realized that this was thermal inflow across the airport.

It was a completely blue day, and I spent the afternoon giving myself a spring check out. The exercise today was to repeatedly answer the question, "where is the next current thermal?" Using estimated winds aloft and ground features.

From a mile up, it's hard to recognize the slope of the land, but this is extremely important in understanding thermal sources.

It's also useful to have an accurate estimate of the wind aloft. Today, the LXNAV S-80 and the Oudie IGC usually disagreed, with the S-80 generally being at least 10° counterclockwise.
During sustained circling, the two instruments were often as close as five or 10° and 2 to 4 kn. During straight flight, they steadily diverged. As best I could tell, by watching my draft during circling flight, the truth was roughly halfway between the two.
The Aspen aircraft flight instrument designers refused to give a wind or direction estimate if the velocity appears to be less than 10 kn. I would prefer an inaccurate guess over nothing, and I was grateful for the disparate guesstimates that I had.

I really didn't try to make cross-country speed. I greatly enjoy the challenge of understanding the atmosphere, and I really don't care how much distance is covered.

I landed after 5 PM. I could've flown at least another hour, but 4 1/2 hours is enough for the season's first flight.

The temperature aloft was about -10dC, so my feet were slightly cool at the end. Long johns, a thick fleece shirt, and black jeans were just the ticket.


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Peter H. Braasch
DG Flugzeugbau
M+D Flugzeugbau
IMI Gliding
Jonker Sailplanes
SCHEMPP-HIRTH Flugzeugbau GmbH
Alexander Schleicher
Deutscher Wetterdienst
Cobra Trailer
TQ Avionics
LANGE Aviation GmbH
WINTER Instruments
Air Avionics
Rent a Glider
Segelflugschule Wasserkuppe