[VSKYLABS Newsletter] issued 22th November 2024
Hello VSKYLABS Test-Pilots!
In the very-near future, the VSKYLABS 'Test-Pilot': SR-71-TB is about to be updated to version v2.0.
The VSKYLABS 'Test-Pilot': SR-71-TB is a highly engineered SR-71 simulation Test-Bed. It is one of the leading VSKYLABS development efforts. VSKYLABS goal is to set a highly realistic simulation of the SR-71 as well as a professional SR-71 knowledge portal which will grow side by side with the project development evolution. Portal 'central' is evolving in the VSKYLABS support forums at the .org
Launchable D-21 Mach-3 Drone:
Upcoming version v2.0 includes a major change in the aircraft configuration, where the 'dummy' D-21 drone will be replaced with a 'hot', launchable D-21 drone.
Here's a video showing a few segments of launch and clear separation of the VSKYLABS D-21 drone, from the VSKYLABS SR-71-TB aircraft, in X-Plane 12:
A short background on the D-21:
The D-21 was a high-speed reconnaissance drone developed by Lockheed's Skunk Works in the 1960s under the direction of Clarence "Kelly" Johnson. Designed for Mach 3.35 speeds and capable of reaching altitudes of 95,000 feet, the drone operated autonomously, carrying out reconnaissance missions over denied territories without risking human pilots. Originally launched from an A-12 aircraft variant, the M-21, the program later transitioned to launching the D-21B model from B-52 bombers using a solid rocket booster.
Images attribution:
By U.S. Air Force – Original source: Roadrunners Internationale, Public Domain. Wikimedia Commons entry: File:M-21 Rear.jpg - Wikimedia Commons
VSKYLABS 'Dummy' vs 'Flyable' D-21 Drone:
The current version of the VSKYLABS SR-71-TB features a 'dummy' D-21 drone, a non-functional model that can be added or removed. While the dummy drone affects the aircraft’s weight and balance, it does not have any operational capabilities—it cannot be launched or fly.
With the upcoming v2.0 update, the VSKYLABS SR-71-TB will introduce a completely redesigned D-21. This new version transforms the D-21 into a fully functional, physics-based aerodynamic vehicle within X-Plane 12. Unlike scripted or pre-programmed mechanics, X-Plane's physics-driven environment demands that the D-21 be thoroughly engineered to perform like a real flying object. If the design isn't precise, the drone simply wouldn't fly.
One of the most challenging aspects of this redesign was recreating the D-21’s unique launch process, where the drone is carried on top of the aircraft rather than beneath it. In the real world, launching the D-21 required extreme precision to avoid collisions with the host aircraft. It had to separate positively from the SR-71, clearing its fuselage and vertical stabilizers safely before transitioning into a climb and cruise profile. The VSKYLABS D-21 faithfully simulates this process, from the initial controlled separation to establishing proper power and flight attitude.
This upgrade in v2.0 not only brings the D-21 closer to its real-world counterpart but also showcases the possibilities of X-Plane 12 as a physics-driven flight simulation platform.
VSKYLABS D-21 Operation:
In version 2.0, the VSKYLABS SR-71-TB cockpit features a modified replica of the authentic D-21 startup and launch control panel. Originally located in the back seat of the M-21 (The M-21 was a specialized variant of the A-12 aircraft, the SR-71 predecessor which was designed as part of Lockheed's efforts to create a carrier for the D-21 reconnaissance drone), the panel has been adapted for integration into the SR-71-TB's front cockpit without compromising functionality or authenticity.
The launch process has been simulated in detail, including the sequence of powering up the D-21, activating the fuel pump, igniting its engine, and initiating the launch. For a successful launch, the aircraft must exceed Mach 3, completing an air-refueling segmend following by precise climbing profile.
Extensive VSKYLABS test flights highlighted the critical role of achieving correct airspeed and angle of attack (AOA), which are achievable in high Mach number and latitude (above Mach ~2.5 and above ~60,000 feet). Maintaining these parameters and staying within the launch envelope ensures a clean and safe separation of the D-21.
The VSKYLABS 'Test-Pilot': SR-71-TB version v2.0 is aimed for release next week, if all goes as expected.
So, stay tuned!
VSKYLABS
