It was at this point in the build where i started getting a little nervous. Connecting the various parts wrong, from this point forward, would make a big big problem in flight. If the parts are not aligned it could cause all sorts of issues in flight, as i have found from building foamies. Also, although i haven’t seen exactly how others build epp/laminate planes i was assuming that you wanted it glued foam to foam not glue to foam. So first thing was to get the parts mated up and measure, measure, measure every distance between parts. When i was happy i clamped everything down and measured again, before tracing out the laminate to be removed. Even with all this measuring, i was off about 1/8″ to 1/4″. Not noticeable really but i have no idea the impact this will have on flight. It was also around this point that i had run out of welders glue (copious amounts!). I had recently picked up some E6000 glue and after testing this on some extra epp i decided to use it in place of welders. It was also at this point that i started getting worried about the distance between tail booms as i had NOT made sure my 9×6 prop was going to fit inside that space.
The connection between the tail booms and the tail section is a pretty simple thing to accomplish, but i almost made a mistake that i didn’t realize for several days later. In mocking up the connections i knew it had to be square but i wasn’t sure exactly where i should put them on the horizontal stabilizer. I knew they went outside the vertical stabilizers, but even with that you have several inches to play with. The other connection on the wing is the same angle all the way out so it didn’t really matter on that side (i thought!!More on this in a later part). So making my decision based on aesthetics, i decided to line the outside edge up with the spot right where the 45 cut starts on the horizontal stabilizer, not only using a 90 degree for reference but also measuring the distance between booms all the way down.
As the booms are one of the weaker points on the plane I didn’t want to weaken them any further by making cuts into the foam to hide cables. So i used packing tape to attach it to the plane. Packing tape sticks extremely well to laminate. After i did this i definitely added this in my mind as an option for the rest of the plane if i don’t want to cut into it.
The Motor mount is made of 4 pieces of thick plastic. The holes and tabs fit tightly together. Not hard to get together but tight enough that with some glue there is no fear of it coming apart. The kit comes with several motor mount plates so that you can fit a number of different bolt patterns depending on what you are using. The large hole is for threading a plastic bolt thru the top of the fuselage, thru the motor mount, and into a plate in the bottom of the fuselage. This would make it easily removable. I am going to mount it permanently with the bolt and glue.
As i stated in the beginning posts, the tail section is not touched on specifically in the build videos. In hindsight i see now that the cuts in the horizontal stabilizer were the relief cuts for the elevator. The vertical stabilizers get installed NEXT to that cut, not on it like i did. This caused me to have to make my own relief cuts. The hinge in created by removing one layer of plastic on the bottom of the coroplast. If you haven’t worked with coroplast before, it is very strong. Although it is easy to bend and deform it is very hard to tear or rip it without something sharp to start a cut, so this should hold up to alot of abuse. The control horn is made of a top and bottom plate held together by screws, which i also glued.
The aileron control horns are something new to me, having only used wood glue in horns in the past. They have one plate that slides up and goes on the top of the aileron and another that goes on the bottom. There is alot of force needed to squish the foam enough to slide the locking plate on. This combined with glue on both surfaces should ensure it never comes off in an accident.
Just thought i would share a cool site i check pretty often now. Also check out the youtube channel. Rabbit hole for sure: