Why can’t I find classic aircraft (C-124, C-121, C-47, DC-6/7) for X-Plane 11/12?

Gary, I understand the frustration. I came from the FS2004/FSX world as well, and that era had a massive classic aircraft community. A lot of those old Connies, DC-6/7s, C-47s, etc. were labors of love built over many years, often by people who had access to manuals, photos, and sometimes real-world crew experience.

The short answer is: Laminar/X-Plane generally does not create those aircraft themselves. For the most part, X-Plane relies on third-party developers and freeware authors to build them. If no developer sees enough demand, has the data, or wants to spend the time, the aircraft simply may not exist in a good state for XP11/XP12.

Why you are seeing fewer good classics in X-Plane

• Smaller classic-airliner developer base
  FS2004 and FSX had a very large historic aircraft community. X-Plane has always had a more niche group of developers for that type of aircraft.

• Complex cockpits take a lot of work
  A proper C-121, C-124, C-133, DC-6, or DC-7 with engineer’s station, authentic systems, correct fuel management, radial engine behavior, pressurization, and period instrumentation is a huge project.

• Performance data is often incomplete
  Wikipedia numbers are useful for a general overview, but they are not enough to tune an aircraft properly. To get it right, the developer really needs performance charts, power settings, weight-and-balance data, climb/cruise tables, engine limitations, propeller data, and operating procedures.

• FS2004 aircraft do not transfer cleanly
  A lot of those older aircraft were built around FS2004/FSX gauges, panels, and flight models. Converting the exterior model is one thing. Converting the cockpit, gauges, systems, sounds, and flight behavior into X-Plane is a different matter entirely.

• XP11 to XP12 added another hurdle
  Even aircraft that worked acceptably in XP11 often need updates for XP12 due to changes in lighting, flight model behavior, weather interaction, and other sim-side changes.

On the C-133 performance issue

If the C-133 you tried is not matching the real aircraft, that may not mean X-Plane cannot do it. It more likely means the aircraft file itself was not tuned very well.

In X-Plane, performance depends heavily on how the author built and adjusted the aircraft in Plane Maker. Things such as:

• wing area and airfoil choices
• engine power and propeller setup
• drag values
• empty weight and fuel load
• CG limits
• flap settings
• gear drag
• control authority
• engine altitude behavior

If any of those are off, the aircraft can look like a C-133 but fly nothing like one.

What I would do in your shoes

1. Search specifically by aircraft type plus XP11 or XP12
   Try separate searches for “C-121 X-Plane 11”, “C-124 X-Plane”, “DC-7 X-Plane 11”, etc. The results can be scattered and not always obvious.

2. Check the X-Plane download libraries
   The freeware side is where most obscure military transports and old propliners tend to appear. Quality varies a lot, so screenshots alone are not enough.

3. Look for XP10 aircraft that may still load in XP11
   Some older aircraft can be made usable in XP11 with adjustment, though the cockpit and systems may be dated.

4. For XP12, assume it may need work
   If an aircraft was not specifically updated for XP12, expect possible flight model, lighting, panel, or engine issues.

5. If you have real data, offer it in a structured way
   Instead of only general specs, developers need items like:
   • takeoff power settings
   • climb power settings
   • cruise charts
   • fuel flow by altitude and power
   • stall speeds by configuration and weight
   • takeoff and landing distances
   • engine limitations
   • weight-and-balance data
6. Consider asking for a Plane Maker tuning effort
   If the exterior model is acceptable but the performance is poor, someone familiar with Plane Maker may be able to improve it without building the whole aircraft from scratch.

A realistic expectation

The C-47/DC-3 type aircraft are the most likely to be represented well because they are popular and well documented. The C-121/Connie and DC-6/7 are more involved. The C-124 and C-133 are much more niche, so good versions are far less likely unless a dedicated developer takes a personal interest.

I would not take Laminar’s silence personally. They are focused on the simulator platform itself, not necessarily filling every historic aircraft gap. The classic aircraft scene depends almost entirely on third-party interest.

A few questions that would help narrow this down:

• Are you using X-Plane 11, X-Plane 12, or both?
• Are you looking for freeware only, or would payware be acceptable?
• Do you need a full 3D cockpit and engineer’s station, or would a good flight model with a simpler cockpit be useful?
• Which aircraft is the highest priority for you: C-124, C-121, C-47, DC-6/7, or C-133?
• Do you have actual manuals or performance charts from your C-133 time, beyond the public summary figures?

If you can post which specific C-133 package you tried and what part of the performance is wrong, we may be able to tell whether it is a simple Plane Maker tuning problem or a deeper aircraft-model issue.