Proof (oz11758)

About this Plan

Proof. Radio control electric powered sport aerobatic model.

Quote: "THE INSPIRATION to design 'Proof' came when a member of my local club built a semi-aerobatic electric model from a kit. Although it flew reasonably well, nearly every landing caused something to bend or crack. It seemed to me that this was down to two things: it weighed too much and the flat-bottomed fuselage made the motor vulnerable to ground damage.

With these points in mind, I drew the plans for Proof, hoping for an all-up-weight of around 2-1/2 lb. The fuselage bottom was drawn curved with the lowest point falling below the Ni-Cad position to keep the motor shaft clear of the ground.

To keep weight to a minimum a fully built-up structure was used, with very little use of ply. The model really does not need 'beefing-up' as the prototype has had over 150 flights without any damage. Lazy builders - do not be put off by the built-up wing, it is an evening's work.

The name 'Proof' came about because I wanted to prove to my local club's members that you could have a great performing electrical model without the need for an expensive motor/battery combination.

Wing: Start the model by building the wing first as it is useful to have a finished wing when completing the fuselage construction. The wing is built using 36 in lengths of wood; one piece and no waste. I always cut a rib template from cardboard or plywood and use it to draw out all the balsa ribs. It is worth the effort as the ribs come out exactly the same size - at least they should.

Lay the plan on a flat board and give it a good waxing to prevent any glue from sticking to it. Pin the trailing edge stick in position, followed by the 1/4 square rear spar. Starting at the centre section, glue all ribs to the spar and traling edge. I use medium cyano throughout the construction. Once all ribs are in position, glue in the the upper spar, checking that it sits down correctly in the rib slots..."

Proof, RCM&E, June 1990.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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