About this Plan
Doublet. Radio control sport twin model. For 2 x Enya .19 motors.
Quote: "AFTER spending some weeks looking around for a new project, I developed the urge to build a twin, and the sight of a large twin flying at Esher Club symposium last year finally spurred me on. I really wanted an acrobatic model, and, as there didn't appear to be a commercial plan available, I set out to design my own.
The basic aerodynamics are those of a conventional acrobatic single engined model, but with the two engines and a scalish fuselage. The resultant model is really satisfying to fly, being quite lively on the two 19's and it really dispels some of the fantasies put around about what will happen if one motor cuts!
Doublet will loop, bunt, roll, spin, and fly inverted as well as any single engined model of the same calibre, and that beautiful beat of the two motors, I find a real thrill. If a motor does cut, she will hold off with a little aileron and even climb slowly, so, if you feel you want to have a go, let's make a start.
Construction. This model is not intended for the beginner, rather a new adventure for the reasonably accomplished builders and flyers, so I will do my best to point out possible pitfalls in construction rather than provide a blow by blow, A to B method of construction.
The original model had a home-made foam wing covered in mahogany veneer with strengthening hardwood spars to carry the undercarriage and to stiffen the area by the nacelles in the positions shown on the plan, but a built up wing is shown should you prefer this type of construction. Join the two halves together using the two 1/4in plywood dihedral keepers, and web in between top and bottom spars at the two inner bays using 1/8in hard balsa, grain vertical. Use a wing jig if you have one, to preserve alignment..."
Doublet, RCM&E, June 1977.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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