About this Plan
Motopou. Radio control sport model for electric power.
A simplified semi-scale model of the Yves Millien Motopou microlight. See http://pouguide.org/le-motopou.html for more details of the fullsize plane.
Note this plan is available as a free download from the excellent pouguide.org site at: http://pouguide.org/Aeromodelisme-1.html along with a full 8 page article detailing some history and the complete model contruction, along with notes on trimming and flying.
Quote (google-translated from the French): "Construction: Very simple we said! Are there two wings? So what? There is only one rib jig to do, two wings almost identical to the number of ribs ready, and especially no control surfaces. Very little material, we try to make it light, let's never forget that. No formwork, that complicates, whereas the generously dimensioned side members and especially the steel side member webs ply 0.4mm on each side will give it a famous and amazing torsional rigidity. That's it that need to be treated.
The wings are therefore quickly assembled on a simple building board, flat, then the ends connected by the keys. Simpler, I don't see. The ends of the front fenders and rear are built on the plane of the associated central parts, as if we made two additional central halves. I cut out my ribs one by one, with a template in plywood. If this method is precise and saves wood, it is a bit tedious 44 ribs to be cut (but precise)... I therefore recommend the block method!
The spars are 10x3 balsa sticks purchased as is, not taken from a board. So the spars are very straight and stiffer, it's a personal observation. For the leading edges, you can replace the wooden round with carbon if you are afraid, it will be concrete. I have put samba and it's the right price / strength compromise. No carbon if possible in this plane, I want it accessible to everyone and not expensive.
The fuselage is a single hull. 20/10 balsa blanks, lined with another 20/10 balsa layer but with the fibers at 90°, but you can also line the fuselage with a layer of ply 0.8mm. The two masts of the cabin go down to the bottom of the fuselage and locally replace the sidewall lining. The hut is designed in such a way that nothing unplug when transporting and assembling the Motopou. Four screws, it's in the trunk, and it is reliable. Not even a command to unplug.
The fin is of the stick board type of 10x4 that you will cut yourself from a light 40/10 board. This same board of 40/10 has already been used for the wings to make some ribs and the salmon... Nothing is wasted! For the 4x4 corner strips, here again they will be more beautiful and solid purchased in state... In fact, it would be easy to industrialize this Motopou... If someone wants to make a kit of it, let him contact me, we'll work it out!
Check before attacking that your engine goes well in the nose, you never know! Do not hesitate to modify if necessary, it is not a critical point. I did not draw the radio installation completely, leaving you for this to be inspired by the photos and your equipment available, knowing that the plate is positioned so that the order of the wing is vertical. Only recommendation, make a very rigid frame because the wing pushes above, mine is balsa 40/10 with a strip of ply 0.8mm above and below the level of the screws of the servos, it's concrete.
Regarding the servos to use, I recommend two servos 16/20 gram format for the one-piece wing and the fin. They will pull about 2.5 to 3 kg/cm, and will therefore be comfortable. For example the Hitec HS81 are going very well... While I'm at it, the fin control is in CAP 0.8mm in a sheath, that of the wing in threaded rod Ø2mm with clevises. I didn't want to make a carbon bead or welds... Simple and reliable as we said above..."
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