MSFS24 [Paid] Request for Proposal: Development of "Seraphim" SSTO Project

[Karl Bushby]

aSIMetric, a nonprofit focused on science literacy and engagement, is looking at novel ways to engage young people and the public alike. We have a budget allocated for 3D modelling development as part of a simulation program and are seeking a professional engagement.

Project Vision:
The long-term objective is to develop a custom, near-future Single-Stage-to-Orbit (SSTO) vehicle for a networked, four-person physical simulator. Designed for scalable deployment across widespread population centres, the system will deliver a completely immersive, tactile, and kinetic experience spanning both atmospheric flight and space exploration. Part of a science engagement and capture strategy.

The model is specifically designed and built for use with the nonprofits simulation strategy. Use within the MSFS community is not our priority, however is certainly up for discussion going forward.

Immediate Priority: Flight Model Tech Demo
The current phase focuses on establishing a baseline tech demo utilising Microsoft Flight Simulator (MSFS). This demonstration will validate the integration of specialised third-party modifications, proving our technical capability to transition seamlessly between conventional atmospheric and orbital flight models. With the sole purpose of showing the potential of modern immersive simulators within a given architecture.

For this we need the model vehicle and systems. We are looking to recruit modellers competent in the following:

• 3D Modelling: High-fidelity vehicle modelling and texturing via 3ds Max or preferably Blender.
• Systems Engineering: Custom avionics and logic programming utilising C++, WASM, and JavaScript.
• Platform Integration: Deep architectural familiarity with the MSFS SDK, environmental configuration files, and flight dynamics tuning.
• Texture/PBR artist.

Technical Objective
To design, develop, and integrate a high-fidelity, (SSTO) hypersonic lifting body within Microsoft Flight Simulator (MSFS). In short; think of a staged rocket with wings, built as an aircraft capable of point to point atmospheric flight, high altitude flight and orbit. The architecture requires custom WebAssembly (WASM)-based engine logic. A 3D cockpit is not a priority. The model and system needs to be optimised to work with physical hardware, the same applies to the visuals, out of cockpit views.

Contacts
WhatsApp: +52 315 1060361

KarlBushby@asimetric-edu.org

Current Assets

• Existing Assets: Foundational 3D assets (built in 3D Max) and comprehensive design specification documents are available. https://www.artstation.com/artwork/18nk32

Core Technical Requirements & Development Strategy

• Propulsion System: Custom-coded hybrid air breathing/rocket engine linear aerospike logic with dynamic thrust-to-density ratio modelling.
• Model Variants: The pipeline will deliver either a unified flight asset or two distinct variants—one optimised for conventional atmospheric flight and another equipped with orbital staging capabilities—depending on technical constraints.
• Hybrid Flight Logic: Must simulate a transition from high-subsonic/supersonic air-breathing mode to closed-cycle rocket mode at the edge of the atmosphere. There are questions here yet to be answered, progress dependent flexible approach.
• Modular Separation: Execution of an in-orbit separation event where the forward section, Multi Purpose Exploration Vehicle (MPEV), becomes an independent flight entity, with corresponding changes to the "Seraphim" (lifting body configuration) base mass, inertia, and centre of gravity.
• Flight Model (FDE): High-alpha handling characteristics consistent with a lifting body design, requiring custom aerodynamic coefficients rather than default MSFS flight model limitations. Introducing a set of linear aerospike engines capable of Differential Thrust Vectoring (DTV) changes the equation allowing for more creative solutions.

Vehicle Specifications (Adjustable)

• Dimensions: 50m length, 5.8m width, 49m wingspan.
• Payload Capacity: 60,500kg (Main Bay) + 2 x 1,000kg (MPEV Science Bays).
• Performance Max Thrust Rocket Mode: 809,312Lbf (3,600kN)
• Minimum Runway Length: 10,000ft (3,048m)

3. Proposed Phasing

• Phase 1 (Proof of Concept): Implementation of the flight model, propulsion logic, and basic separation scripts. Testing via "placeholder" geometry to ensure physics engine stability.
• Phase 2 (Visuals/Assets): High-fidelity 3D modelling, PBR texturing, and systems design.
• Phase 3 (Testing/Optimisation): Performance optimisation for varied hardware, flight testing, and final packaging.

4. Developer Requirements

• Proven experience with C++/WASM for custom avionics and flight systems.
• Strong portfolio of high-performance or military-grade aircraft in MSFS.
• Ability to work with technical reference documentation for hypothetical physics/aerodynamics.

Notes:
Currently I am finishing a long duration expedition on foot over many years. This is due to cross the finish line in November 2026. For this reason I don’t currently have, nor have I had, direct access to hardware able to test and validate simulation elements. I personally have minimal experience or opportunity with MSFS. I do have limited prior experience, and built, a custom two seat flight deck simulator using FSX for a STEM

workshop.