Ariane 6 (A64)
In June 2018, I was completing several long-standing projects for launching in Summer and thought about starting a new project. I'd come off a sequence of open-interstage projects (Aerobee, Iris and Boosted Arcas) and needed something different.
The Ariane 6 A64 is planned to have four strap-on boosters, something I had not yet undertaken, so that seemed perfect for a new challenge.
The first question with a scale model is always the scale. As usual, I try to come up with a scale that corresponds to available body tube sizes. This rocket also couldn't be too small because I needed space for the drop-away booster mechanism so I wanted to use a 5.5" or larger tube.
At 3% (2.85% to be precise), the main body could be 6" tubing and the boosters could be 3.9" tube couplers:
|Prototype (m)||Model (in)||Model (mm)|
|Main AF len||60.6||68.0||1721|
|Main AF Θ||5.4||6.1||154|
|Main nose len||8.3||9.3||237|
|Booster AF Θ||3.4||3.8||97|
|Booster body len||13.0||14.6||371|
|Booster nose len||13.0||14.6||371|
This also makes the rocket a manageable size at 5' 10" (1.8m).
Unusually for me, the prototype rocket is not yet in service. So "history" is a bit of a misnomer. There is good general information on French Wikipedia. There are also some nice 3D renderings for reference.
I also found the image above very useful for getting dimensions, even if not complete, thanks to "Crumb fire" on The Rocketry Forum.