This is the second part of my Delta IV paper model series. On my previous post I described the Delta IV Heavy version.
The Delta IV Medium variant has only one Common Booster Core, and it can fly in 4 different configurations based on the diameter of the second stage and the number of solid rocket motors (SRM) attached:
-Medium (4 mt diam and no SRMs)
-Medium + 4-2 (4 mt diam and 2 SRMs)
-Medium + 5-2 (5 mt diam and 2 SRMs)
-Medium + 5-4 (5 mt diam and 4 SRMs)
The photo shown below demonstrates all the parts that conform my Delta IV Medium model.
The hardest part in the design process of this model was the attachment parts for the SRMs, and my research was based using several photos from the real Delta IV medium. The SRMs parts will use a rod that inserts into the upper attachment points on the CBC, and a special part that snaps in place with a counterpart on the lower attachment point on the CBC.
Here is a closeup of the SRMs that shows the attachments described above. Note that these are prototypes, therefore the details will vary slightly from the final product.
The Solid Rocket Motors in a 4-2 or 5-2 configurations are attached to points 1 and 2 indicated as on the lower segment of the CBC. When all 4 SRMs are attached, they will go to their respectives attachment points on the CBC as indicated. Pairs 1 and 2 usually have a small segment that looks like a skirt covering the nozzle. Pairs 3 and 4 lack this “skirt” segment.
The photo below shows the difference of the SRMs with and without the skirt covering the nozzle.
Some of the photos from the early missions show that there are no numbers on the exterior of the SRMs, while on recent mission, although not all, each SRM has a number on the outside above the nozzle area.
These photos show the corresponding locations for the SRMs.
Shown below is the detail of the upper attachment point on the CBC.
The Medium variant has 2 second stage configurations, a 4mt and a 5mt diameter stages.
Below is a comparison of both second stages (Left: 4mt, Right: 5 mt)
And here are some of the Delta IV Medium models from my Delta IV page. This is a collection of Delta IV models that will continually grow.
The collection keeps growing. Now we have a “FULLHOUSE” of Delta IVs.
Download models are available at my website (click here).