Plumpy Bird’s Design Diary: The End

Originally, after I posted the first post about the plumply bird’s design diary, I was thinking of writing a post every two weeks or so to update the diary as the design progress. Unfortunately, I was so caught up with Overwatch the design process and before I know it, it was already the submission deadline (which is exactly one week ago). So, here we are, skipping the process and jumping right to the end (the design process is boring anyway:D).

Early Doodle of StratoKiwi and StratoDodo

In designing StratoKiwi and StratoDodo, a lot of time was wasted spent on deciding its configuration. Apparently, choosing the aircraft configuration is like choosing a man/woman for your husband/wife. Everyone has their own preferences and every man/woman has their own plus side and minus side and actually it is not hard to find the right spouse for you. However, in choosing aircraft configuration, it is like choosing one spouse to be married by six persons at once. It was a disaster. After a lot of discussion, arguments, death matches, and bribes, we finally agreed to one configuration which is an embedded engine with outboard horizontal and vertical stabilizer (OHVS).

In OHVS configuration, the horizontal tail plane (HTP) is placed on a boom on the wing tip. This is done to take advantage of upwash flow generated by the main wing in order to create a ‘drag-free’ upward lift on the HTP. However, in order for this configuration to work, the HTP must generate upward lift instead of downward lift as in the conventional configuration. As the consequences, in order to be able to trim the aircraft, aircraft’s center of gravity (CG), must be located somewhere between the wing’s aerodynamic center (AC) and the HTP’s AC. However, for the stability of the aircraft itself, aircraft’s CG must be in front of the complete aircraft’s AC. This means that aircraft’s CG must be located somewhere between the wing’s AC and the complete aircraft’s AC. This restriction on CG location ultimately leads to a lot of problem such as the placement of landing gear (in order to obtain the proper load distribution between the nose and main landing gear), the size of the tail (due to the short arm length to CG), and the fuel tank placement (to prevent too much CG travel). Fortunately, after some headbanging and sacrificing some sweets as an offering to the Chocolate Mint Goddess, we managed to complete the OHVS design.

Preparing Offering to the Chocolate Mint Goddess

So, last week, after a couple of sleepless night and unhealthy diet (okay, the unhealthy diet is my lifestyle, it has nothing to do with this project), we submitted the design 10 minutes before the deadline. Of course, a lot of stupid mistakes were found and maybe some calculations were incorrect, but nevertheless, like a digimon tamer that will still loves his partner although he evolve into Numemon, I am so fuckin’ proud of my baby. And here is what my baby (and his oversized VTP) looks like.

StratoKiwi – Three View Drawing

StratoDodo – Three View Drawing

Now, while the work was done and there is nothing that we can do for the competition, I am still thinking of proceeding with making an X-Plane model for both aircraft so that I make a video of it flying and hopefully not crashing. The making of X-Plane model is in progress as this post is written, however, since I am famous for not keeping my promise, don’t get your hopes high.

Stepen

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