The DHV is on a high-tech gyroscope, which allows you to train in his harness "on the ground" to withstand G-forces, test the triggering behavior of various rescue containers with twist-or satellite falls (Photo: DHV ) . On the Internet this is a very interesting and worth reading report and videos with positive and negative examples. Technically, therefore, the following security configurations of "poor" were: 
(Graphic: wetter3 ) 
(Graphic: windfinder ) 
(Graphic: Windfinder ) 
The initial flight demonstrations were under severe conditions: The wind blew squally from south of the east-west path of the towed glider space Sevelen. Ado was dragged across the path along a dirt roads. When the wind speeds no towing was necessary steps to achieve great heights. Nevertheless, only showed the Dutch around Jan Meerbeek the drag center Toldijk their skills, then led Markusberg house before the flight school Active Zone that even with a German wind Kirchner is levels towing possible K6 (Photo: Towing performance K6 with built-in cable brake) . 
The biggest risk in.. tow levels is that the pilot on the rope at the wrong time again attracted is. Whether because of the wind driver engages too early or because the rope gets caught somewhere and thus breaks around the pilot. To mitigate the consequences of such cases or to avoid altogether, the Dutch have developed a special safety latch. These triggers, similar to a ski binding automatically when there are more lateral traction. To be solved only with structurally rigid handles (no Gurtbandklinke). Each pawl is adjusted to the weight of the pilot (adjustable spring). Since then, this variant is used in Holland, where it has no more accidents associated with the actual towing. (Photo: Jan Meerbeek demonstrated as with a simple device with a spring balance, the resistance of the lateral release of the latch set) 
special technique also to the winch. First, the transmission can be built so that in the uncoupled state for pulling the ropes, only a small amount of force is necessary. The most common wind types in Germany (with VW engine) can not meet this requirement. January Meerbeek winds based on an engine of the Honda Civic with automatic transmission, which for this Purpose is reinforced. However, these winds there has not been an automatic draft control, as prescribed by the DHV in Germany. Wind farm with its K6 Dieter Kircher promises a gradual slow viable solution, as this does not require differential and its frictional resistance. 
(Graphic: wetter3 ) 
Recently I have in my blog on the newly prepared and approved launch site Rosenberg at Kobern-Gondorf written on the Mosel. Yesterday I was even on the ground and have him take a close look and even start a first test flight. Sorry, there was the rather disappointing (almost pure sliding), which was with the little bit too much to expect from the southeast wind, but coming from the side. However, the trip has already revealed some things not with a clear photo and Google-Map-study recognizes so impressive. Most of it has dampened my euphoria born of the theory for the new launch site earlier. 
last few days there in the Eifel, a new certificated Mountain: the Rosenberg at Kobern-Gondorf on the Mosel. In January, the kite and glider friends Rhine-Moselle-Lahn (RML ) prepared the best starting place. From now on there should be flown. Starting direction is SW-S-SO, which fit the contours of her site for a better S and SO Soaringflug. The conditions for the Rosenberg strict conditions attached to all pilots must hold to the ground is not equal to threaten again. For the time being, the authorization is valid for one year only - as a test of whether the flight operation with nature conservation (including directly adjacent SAC) is compatible. (Photo: R. Boehm) 
flight
With the flight time calculation is determined based on the battery capacity and the motor current indication, the flight time.
propeller
In this calculation, it is the interpretation of the propeller. Based on several parameters such as the nominal flight speed here, the slope and the diameter is calculated. Other parameters are the speed, voltage, efficiency and engine power.
speed (maximum and minimum) flies
How fast is my model airplane with this prop? With the speed calculations, the maximum and the minimum required velocity is calculated.
wing loading
Due to the mass of the model and the square footage (wing area) is here determined the surface load. fly at a high wing loading the aircraft needs to quickly generate the necessary lift. Aircraft with lower wing loading can according to airspeed.
thrust
The static thrust calculation, we calculated the thrust of the drive.
on my iPhone website has more information and screenshots of the app.
(Graphic: wetter3 ) 
glider grand prix from broers philippe on Vimeo .
Also in the paragliding community have begun considering whether these could be implemented crowd-pulling race formats, including documents not with the slower pieces fly. A first attempt by Primoz Susa a Paragliding Grand Prix in Slovenia has recently been on the net. While this is not yet live, but it shows where we are headed.Winter Paragliding Cup Buzet from primoz.susa on Vimeo .
(Graphic: wetter3 ) 
Disco in Colombia from Oleg Krasíkov on Vimeo .
