Well this project is taking forever because building Depron models is tedious work, and FancyFoam doesnt even offer a set of instructions for this model. It says clearly that it comes with written instructions but it doesn't. Mike from FancyFoam says to just use the MX2 instructions, but they are much different than the MX3. Lets just say, there is a huge area of opportunity here because this is the plane that won the ETOC last year. Yet they didn't even bother to offer a simple set of instructions.
I would say this build is not for a beginner. Fortunately I have build some depron models in the past that require carbon fiber (CF) reinforcement, but nothing like this. One of the first things I did was to flex the control surfaces so they can travel friction free.
MX3 Depron Freestyle TVVPP Project by
tomshue, on Flickr
Here is the control surfaces bent flat and weighted. Its not an EPP model and Depron doesn't have memory like EPP, but I think flexing the control surface joints is a good idea.
MX3 Depron Freestyle TVVPP Project-2 by
tomshue, on Flickr
This plane has some serious control surfaces.
MX3 Depron Freestyle TVVPP Project-3 by
tomshue, on Flickr
The next step is to square up the lower half of the fuselage and start bracing. Dont glue it yet, just start bracing. Its a good idea to weigh down the wings and horizontal fuse to keep it flat when installing the CF bracing.
MX3 Depron Freestyle TVVPP Project-4 by
tomshue, on Flickr
MX3 Depron Freestyle TVVPP Project-9 by
tomshue, on Flickr
MX3 Depron Freestyle TVVPP Project-5 by
tomshue, on Flickr
You want to think in triangles when installing the support bracing. This is the main wing support, but you still have to add cross bracing to make it solid.
MX3 Depron Freestyle TVVPP Project-10 by
tomshue, on Flickr
All od the bain bracing is 1.0 CF rod, but the cross bracing is .8 CF rod. At the joints, its wrapped with 10lb test Spyder Wire and hit with a drop of CA and Kicker. The trick when working with CA on depron is to prime every joint with kicker then use
tiny tips from house of balsa to disperse the least amount of glue possible. Also have thin strips of paper towel ready to wick up CA and kicker if you accidentally use too much. The whole goal here is to reduce weigh. Also be careful and test your kicker and CA on some scrap pieces of Depron. Even, "Foam Safe" CA will eat up depron if you arent careful.