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In 1944, Dr. Alexander Lippisch proposed the ramjet-powered delta wing P13a interceptor. In order to evaluate the aerodynamic performance of this radical design, Lippisch worked with the Darmstadt and Munich Akaflieg (aerodynamic engineering technical universities) to build the DM-1 glider. The DM-1 is a pure delta wing design with no separate fuselage and the pilot seated in a large vertical stabilizer. It was designed to be launched by aircraft piggy-back, tow or rocket boost.
The construction of the DM-1 was not complete by the end of WWII but the allies asked the students at Darmstadt and Munich Akaflieg to finish the aircraft in order to allow further research. The completed aircraft was taken to the US and evaluated by NACA in wind tunnel tests. The results of those tests contributed to future work on delta wing designs including the Convair XF-92, F-102 Delta Dagger and F-106 Delta Dart.
This X-Plane model recreates the DM-1 glider using data from the postwar analysis, historical documentation and the National Air and Space Museum (who currently holds the aircraft).
Historical sources suggest that rocket assist was planned to test the aerodynamics at speeds unattainable by piggy-back glider launch. However, the lightweight and simple wood construction of the aircraft makes the use of rocket motors problematic. The popular HWK 109-500 Starthilfe JATO unit provides long duration thrust but weights more than half the static weight of the base aircraft. A more feasible approach is to use the Rheinmetall-Borsig RI 502 solid-fuel JATO rockets which provide 1300 lbs. thrust for 6 seconds.
An experimental rocket-assisted version of the DM-1 is included that utilizes a pair of RI 502 JATO units fired sequentially to give 12 seconds of thrust at 1300 lbs./second. The units are mounted on the bottom of the aircraft between the landing gear. This mounting maintains the center of gravity and utilizes the strength of the landing gear structure to support the motor thrust. The dry weight of the aircraft remains the same by removing the water ballast and some related equipment to compensate for the added weight of the engine casings. The fuel load is an additional weight that pushes the limits of the aircraft's capacity but provides up to 300 km/h additional performance.
The rockets are activated using the X-plane sim/flight_controls/ignite_jato command. The RI 502 JATO units are defined as drop tanks and can be jettisoned using the sim/flight_controls/drop_tank command (once for each rocket motor). However, X-plane does not simulate the weight reduction from dropping the casings.
Note that X-Plane models JATO fuel as an expendable associated with loading of the aircraft model. If you want to make multiple flights with JATO you must reload the aircraft (Developer/Reload the Current Aircraft) to refuel. Just Start[ing] a New Flight does not reload the JATO units.
The archive lippisch_dm-1.zip has 89 files and directories contained within it. View them...
This list displays the first 500 files in the package. If the package has more, you will need to download it to view them.
|Filename/Directory||File Date||File Size|
|NACA 0015-64.afl||07.21.17||25.21 kB|
|NACA 0017.5-64.afl||07.25.17||25.21 kB|
|standard six||08.09.17||0 B|
|artificial horizons||08.09.17||0 B|
|turn slip||03.16.17||0 B|
|vertical speed||03.16.17||0 B|
|Lippisch DM-1 Description.txt||08.10.17||7.95 kB|
|Go to Fly Away Simulation.url||01.22.16||52 B|
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