Sequel (oz15436)

About this Plan

Sequel. Radio control 'pivot-wing' slope soarer model.

Quote: "Sequel. Mike Freeman offers plans for an agile little slope soarer with all-moving wing for roll and pitch control - its a follow-on to his successful `Prelude design of last year, hence the title!

After the success of Prelude (oz11947) I wanted to adapt the design to produce a smaller end product. People say that development improves a design and in accordance with this, there have been a few changes - other than the obvious one of size.

Although the overall shape of the fuselage is unchanged, Sequel is quite a bit stockier than Prelude, the main reason for this being to improve access to couple up the wings. There is nothing worse on a freezing cold Sunday morning than fumbling about with clevises inside a tight fus! The actual linkage of the surfaces has changed although the very successful rocking servo mixer is retained and the wing retention is revised again to make connecting up much easier.

The wings have a lower aspect ratio and a larger sweepback; this was done to increase the movement at the tip trailing edge to increase response, especially when using the flat bottomed section which seems relatively less responsive than the semi-symmetrical section. As mentioned, the section has changed to flat bottomed, mainly because this seems to be the best section for low aspect ratio wings to maintain flight in a reasonable range of wind speeds.

The tail end has changed to mid fin 'T' simply to improve transportation whilst dismantled. Structurally the building of sequel is very much the same as Prelude so if you have already built Prelude, Sequel will be a doddle. Right, clear the decks (so to speak!), here we go...

Before starting, check that the servos you are using fit the servo box and adjust as necessary. There is plenty of room in the fus. for modern equipment but just check to make sure! If you enjoy turning your models inside out it might be a good idea to "beef up" the combination pivot with larger diameter stock. 10 swg is, however, quite adequate for sports flying.

Fuselage: It is important to start with the fus; this is because a good square joint between the wings and the fuselage is necessary. Start by cutting out the sides and ply doubler to the marks shown. Drill out the holes required in the ply only at this stage. Next, glue the triangular longerons and ply doublers onto the balsa sides, remembering to make a left and a right! Now that you have a good guide or template, cut out the holes in the balsa sides. Next, cut out and make up the formers as shown on the drawing remembering to drill all the holes where required again using the ply parts as a template.

Whilst the formers are drying, cut out the 1/8 ply strengtheners, drill the holes for binding the main bearing sleeves (but dont bind anything up yet). Now, over the plan, make up the F2, F3 and ply strengthener assembly. It is very important that this assembly is all square as the accuracy of the rest of the model depends on it.

Next make up the servo box as shown on the drawing to suit the servos, cut the main bearing from 10swg brass tube and check for a smooth action in the 8swg servo box bearing. Assemble the servo box and main bearing sleeves on to the main bearing and spot glue the sleeves in place ensuring the servo box is central. Make sure that no glue gets between the servo box bearing and the main bearing..."

From Radio Modeller, May 1986.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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