On 28 Nov., 22:15, Dan G wrote:
On Nov 28, 6:22 pm, "Sönke Gutzlaff" wrote:

950m steel cable + 350hp winch + 20km/h wind + ASK21 = 750m or 78%.
More high was possible, but airspace class C begins at 750m above our
airfield so I had to release the cable.

I think the ASK21 gets the best high on winchlaunch. Our DG1000 always gets
25% less high.

Greetings,
Sönke

Sönke, what speed do you fly at on the winch, and how much back
pressure do you apply to the stick?

Dan

We broke this record with 1718 Meter and a 3030 Meter runway (winch
length)
With NO wind condition. (sometimes even tailwind)
In the spring we do some more attempts for a higher record.
Then we wait for better wind/weather conditions.
We had a Notam and a privat airspace till FL70 for the lost month. on
our next attempts we hope to disconnect the cable at FL70

A winch start to 1718 Meter or a higher has some problems to overcome.
Think about wind directions at higher altitudes sometimes 180 degrees
different from ground wind.
Think about the cloud base. in most of the attempts we had to abort
the winchstart halfway due the lower cloudbase.
What happens if the cable brakes at high altitudes?

The winchstart itself takes about 2 min 20 sec. then you still have
about one minute to winch up the rest off the cable.
driving the cable back to the start position, takes about ten minutes,
so a high production would be difficult.

We had a Notam and a privat airspace till FL70 for the lost month. on
the next attempt