About this Plan
Carnival. Radio control trainer for .20 motors.
Quote: "Carnival. Fly MPA with David Boddington's 50 inch trainer for .20 motors.
Carnival is the larger of a pair of models, the other being the 37 inch span Fiesta, designed for the Model Pilots Association as dual purpose models. Both of these designs make excellent basic training models and they are also intended for the MPA 'Single design' fun-fly competitions.
Actually, they may well become triple purpose aeroplanes as I see no reason why they should not become the basis of free flight models - but that will have to be proven first.
You may think that the Carnival looks a little old fashioned - and I would find it hard to argue with such a comment. What the design was intended to produce was a model that could be constructed simply and would be pleasant and easy to fly. To this end it was my intention to keep the model to a modest weight (open balsa wood structures are best for this purpose) and to make the model as 'foolproof' in construction and assembly as reasonably possible.
One of the principal reasons for a model to fail to complete the initial test flight is because of poor alignment of the flying surfaces ie the tail-surfaces are awry or the wings are warped. Carnival has been designed - in common with its smaller sister - to eliminate the risk of misalignment, as far as possible. Tail surfaces are built on a cruciform pattern to ensure they are correctly aligned and the tail unit is then slotted into the fuselage to keep it all nice and square. The fuselage itself is constructed over the plan, onto the lower fuselage sheeting, and is not removed from the building board until the sides, top sheeting and tail assembly have been added.
Wings have a flat bottom aerofoil so that they too can be constructed directly over the plan and diagonal bracing from the main spar to the trailing edge also helps to resist warping.
So there you have the Carnival, a good honest sports/trainer model that will give you hours of enjoyment (even if you are an experienced pilot) and will be your pass-key to the exciting 'one design' contests we will be organising next year. Get building now.
Tail first. Glue the tips and trailing edge to the 3/16 in main tailplane sheet and the elevators and 3/16 in x 1/4 in spruce joiner. Sand and round off the edges. Note that the fin is cut so that the lower part houses into the fuselage, the rudder has an arc cut-out at the elevator joiner location.
Cover all tail parts, leaving clear the lower part of the fin and the areas where the fin and tailplane are glued together. Make provision for the hinges and permanently fix the elevator hinges - the rudder is fixed at a later stage..."
Carnival, RCM&E, November 1991.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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