Potez 58, 500 heures de construction en vidéo, 1ère partie

J’ai résumé en vidéo les quelques 500 heures que j’ai passées à construire le Potez 58. Ci-dessous, la première partie de la vidéo. La seconde partie d’ici …. quand l’avion sera terminé.

Potez 58, tailplane construction

The construction advances and continues with the realization of the tailplane. Rudder and elevator have biconvex profiles with a central core in 0.4 mm plywood. The construction is therefore done with a half rib wedged on the bench, same for the edges of attacks and trailing, then bonding of the core above. Once the glue has dried, add the second half ribs. The scalloping which gives this retro side that I love on these planes, is made with a dremel on which I put a sanding cylinder. I sanded slowly to obtain regular shapes. The whole is covered with solartex.

I really like the rendering of the solartex … Initialy, I put Oracotex, but it was heavier and less beautiful. In the picture below, you can see the central part of the wing still covered with this material.
I have since changed the coating of it by solartex to avoid differences in rendering

To be continued

POTEZ 58, Part 3

At the end of 2016, I took over the construction of the Potez and in particular the tail plane, then installed the wing keys. February 2017 is the assembly of the club (CACH 37), I discussed with the president of my project and he said to me : « you should speak to Alban about it ». Alban Dury is one of the organizers of Anjou Ailes maquettes (https://www.musee-aviation-angers.fr/anjou-ailes-maquettes) which is held every year on the first Easter weekend at the Museum of Angers. Alban is enthusiastic and asks me to participate. I exposed my model in progress and I was able to chat with all these big names well-known in scale airplane models. A little bit intimidated, I admit. I became aware of the rigor and the arduous way to go before arriving at the desired level.
Even if I felt very small next to the regulars. A little discouraged by my very amateur side, but I had my plane in my brain and even if it will certainly not be as beautiful and precise as I wanted, I continued with precious advices in mind. Finally this weekend was enriching and so instructive.

Some technical characteristics:
Wingspan 1.71 m (67.32 Inches)
Length: 1.13 m (44.49)
Wing profile: Clark Y
Profile of the rear tail: Biconvex
4 stroke OS 52 surpass engine
Expected weight: about 3 kgs, including motor, batteries, servos etc …
For scale model details, I want to reproduce the rivets, which seems not difficult to me, but it is especially the absence of detailed images which will be difficult to manage to know the rivets that were present on the real one.
The landing gear is quite tortuous and therefore …. I will have to brainstorm and find people who know how to work metal better than me.
For the rest, there will be the shrouds, the mold parts, plus scale model back and forth cables.

Epp stampe SV4, end of the assembly

I made the landing gear with a carbon rod glued to the structure. A bent iron rod was glued to the carbon rod and held with a piece of heat-shrinkable sheath

The engine’s wires are directly soldered on those of the controller

I then set up back and forth cables in nylon fishing line to control the rudder flap. I passed them on the servo horn, attached them to the control horn by tightening them enough. I have centered the rudder and add a point of glue to fix the nylon in place on the horn.

The aircraft is now complete. It weighs 139 g, including 180 mA battery. Bellow, some photos to illustrate.



Epp Sv4 Stampe assembly almost finished ?


The assembly of the SV4 stampe in 85 cm epp is advancing and almost nearing its end. To start, I cut the location of the aileron servos which were then glued on site

Découpe des emplacements de servos des ailerons
Mise en place du servo d’aileron
Les servos d’ailerons sont en place

Installation of elevator and rudder servos. They are glued with a drop of hot glue.

Les servos d’aileron et de dérive

Horns are glued on the rear tail

Les guignols sont en place. Le plat de carbone visible permet de solidariser les 2 volets de profondeur.

To continue, I installed the flaps controls (ailerons, and elevator). I used a special indoor fine metal rod on the horns and servo paddles connected to a carbon rod. The assembly is secured by a heat-shrinkable sheath and taking care, of course, to adjust the control surfaces to neutral.

Vue sur la commande des ailerons
Vue sur la commande de profondeur, côté gugnol

The ESC is a 6A, the receiver is a special indoor futaba of approximately 5 g.

Finally, a compulsory passage on the scale. The beast has grown (too much). it now weighs 98 g. it remains the landing gear and the engine to fix. I expect 30 g more



Epp stampe SV4 assembly continues (2)

The assembly of the stampe continues with the installation of hinges on the control surfaces of ailerons. I use mini hinges which I find top for planes of this scale.

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Pose des Charnières

Once the glue dried, I realized the « joining » of the ailerons of both high and low wing. To do this, I used a 0.8 mm carbon rod between the 2 ailerons and I used a piece of heat shrink tubing to fix it. It is of course necessary to ensure that the flap of the 2 wings are well neutral.

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Calage des ailerons avant le positionnement définitif

Then I heated the thermo sheath. Don’t forget to put an aluminum foil to avoid melting the epp. Yes, it happens, it even happened to me on this one, but nothing serious.

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The aircraft is weighed once all of the control surfaces are installed. The weight is now of 57 g.

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Epp stampe Sv4 assembly continues

I used 1mm carbon rods to strengthen the fuselage and make it more rigid.

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Bonding of the fixed part of the elevator and installation of carbon rods to maintain the elevator. Be careful to check the squareness and perpendicularity.

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I then glued specific indoor hinges to the under surface of the stabilizer and mounted the flaps

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The movable part of the rudder is reinforced by a 3mm x 0.1 carbon plate on the leading edge to increase the rigidity of the flap.

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I then glued the hinges on the fixed and flap parts of the rudder. I then added rods on the upper part to properly position the vertical rudder.

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A view of the plane. It’s beautiful…. In any case, I like it. The weight is now 51 g, 6 more. But it’s still reasonable. It should weight around 110-120 g.

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Start of epp SV4 assembly

The stampe consists of 2 wings cut in one piece each, the ruder and the rudder flap, as well as the elevator and its flaps. The fuselage consists of 3 parts, 2 parts constituting the vertical seat and a horizontal part which will be located between the 2 vertical parts.

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I started by laying the horizontal part flat on the work surface. I added the lower vertical part of the fuselage and I kept the assembly at 90 ° with wedges and clamps. I then glued using cyano fluid, trying to put as little as possible.

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Once dry, I put the low wing upside down and maintained it on the work surface with weights at the ends, and I just stick in place the vertical and horizontal lower part of the fuselage.

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It’s time to lay the shrouds on which the upper wing will rest. They are made of carbon plate 3 x 1 mm

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Then is the installation of the upper wing. This step is the most delicate, because you have to be careful to maintain both wings parallels. You can see in the photos below that the little brother is watching.

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Weighing of the structure at this point of construction. The set weighs 45 g and is 7 g higher compared to all the elements cut out before painting.

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A photo of the 2 versions so that you can see the scale

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