Here i am again with another project, this is a plane for a friend who ask me to build an Aermacchi MB-339 A rc plane for him, i didn´t see any commercial kit at small size like this so i say "challenge accepted" .
As usual don´t use any plans, or computer design. Just because it´s my way of building planes. I still have an EDF like the one i use on the A-4 Skyhawk so the idea was make a plane little bit longer to take advantage of the greater span of the italian plane, also, i wanted to try make a plane with all the tricks and tips that i used before in other planes. The intake ducts where a real challenge, ´cause the original aircraft has very small ones, and built-in the wing roots, so i had to put them out of scale to reach enough amount of air flow for the EDF unit. Anyway, as i just have 3S batteries and the trust will not be as high as i wish.
Let´s get some Specs:
Wingspan: 930mm (with tanks)
Weight: 570grs (On flight conditions)
Engine: 55mm EDF 4200kv aluminium case from HK (4S Version)
ESC: 30A HK ESC.
Battery: 3S 1300mah 75C TATTU.
First i was drawing the Aermacchi for days before i start to make real size draws so i could put all the pieces of the plane, the electronics and reinforcements togheter in my head.
Once i have a real size draw i built it up from there:
My friend suggest add a landing gear in the future, so i left some balsa/plywood hardpoints inside the wing and nose:
With pacience and calm the plane begin to take his shape:
Nose cone made from a soft foam core, shaped by cutters and sand paper, as the wing tip tanks:
I made some stickers as the Argentinian Navy Aermacchi paint scheme. You can see here also how to cover the top of the plane.
I made this to put inside a plastic PET bottle and get a shinny canopy:
Ailerons pushrods above the wing to prevent some damage on landings and ventral fins made in hard balsa so it could bellylandig with ease:
At this point i choose to make the MAIDEN FLIGHT, so if i have to fix something i will not ruin the paint:
After that hard flight i realize when the C.G. is correct and the plane make strange movements the problem must be the incidence, so i make some modifications to the horizontal stabilizer and try again:
Now it flies great !!!! Let´s make it look cooler drawing some lines with black marker:
And the most important part, the paint job:
I use foam safe acrilic paint and some tips from FliteTest videos:
And some stickers of Argentinian Navy, as the plane piloted by Owen Crippa in 1982:
I hope you like and find the pics useful. Sorry for my bad english, i try to do the best i could. Happy flights!!!!