Announced at the start of the month, FlyingIron Simulations' Grob G 109B aircraft appears to be progressing well, with a further development update posted on the development thread earlier today.

The post touches on multiple aspects of the aircraft, namely flight model, sound design, art and a short section on what's coming up in the development cycle.

FlyingIron have used a different method for producing the Grob flight model to assist in making the most realistic simulation possible. They go on to say that owners of their previous aircraft, the Supermarine Spitfire and P-47 Thunderbolt, can expect an update for their respective planes soon to bring them up to the new standard.

The Grob's FMOD sound pack is also progressing, with a first draft of the engine sound on the table. The developers call this the most complex part of the whole operation, much more difficult than the switches and knobs in the cockpit itself (which will also be simulated).

On the topic of art, Alex, the designer, has little to say on this topic, though he promises more images as time goes on.

In regards to the roadmap for this particular aircraft, the developer had this to say:

"Once the early alpha build is complete, we will start official testing with our full beta-team for further testing & refining. While this is happening, we will then turn our attention towards development of the advanced aircraft features & add-ons, such as maintenance, the Tablet GUI System, GUI Menus, Particle FX and so on."

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You can see the source post for this article on the X-Plane.org Forum. Alternatively, check out the Grob G 109B announcement article from the start of the month here.