Hi again,

I've made some minor updates to the design.

Here's a view of it, along with some measurements (all units in mm)... If they're not clear enough I'll make several pics with higher detail.


My headaches now are caused by how could it be built, while being simple yet strong. So far, my ideas for the fuselage are the following:
- The main structure is similar to a profile. A plywood, lightened profile of the craft (the pic is the "fat" version ), with some balsa ribs (is this the right word?). This could be 2mm plywood, and 4,5mm thick balsa ribs.
- The tail boom has a 8mm diameter. To make it removable, I'd glue a 5cm long, 10mm diameter carbon tube to the rear side of this profile (you can see the hole at the end). This way, the boom would slip into this tube, and stay in place with 2xM2 screws.
- Now foam blocks would be glued between each rib, and then shaped. I think this could be quite straightforward to do with a hot wire; since you have the wood skeleton to use as a guide, you would only need to hand saw a few corners.
- Batts and servos have not been drawn... I'm not sure yet where should I make some space for the RC stuff, but I guess it could be done either in the "cockpit" (see doted line) or maybe between the main gear. I'm not sure how heavy this would all be or which way will I finally build this so, I'll get to this question later.
- After applying the foam, it could be possible to lay a very thin coat of fiberglass... or just some tape to make the foam last lnoger.



Now the pylon... Pretty straightforward as you see in the pic, quite more complex to explain...

- The pylon is mainly a CF tube. At a certain height, it has a plywood piece (it's like the base of the pylon) glue perendicullar to it; this is what fits into the fuselage, and could be secured either with a couple of bolts, some strong magnets, etc.
- There are also some side reiforcements to avoid the CF tube to tilt sideways.
- The CF tube has a slot under the plywood base. This slot fits in the pllywood profile, and should carry most stresses onto it.
- Servos are screw to a small balsa piece, which is glue to the CF tube.



I'm not much convinced with this kind of structure. It looks light because it's mostly a reinforced profile, but for some reason I don't fully enjoy it.
BTW, it seems my engine could get on time for January or so... (they must be making it with a nail file or something). I'm afraid it'll take a little longer than I wanted to build and try this thing.[]

Well, have fun![sm=RAINFRO.gif]