Dinfia IA 45B Querandi (oz8125)

About this Plan

Dinfia IA 45B Querandi. Radio control scale model twin pusher. For electric power.

Quote: "Having been exploring economical electric flight for the last year or so, I felt that a mid-size twin would be an interesting project, since there is no danger of losing a motor in flight with electrics! The Querandi promised to be a good and unusual subject, i.e., a pusher is more efficient than a tractor, with the bonus that the propellers and motor shafts are protected. Also, using a pair of Speed 400 6V motors driving 5-1/2 x 4 propellers, I could use my standard 7-celI 1400 mA sub C battery pack, therefore not needing any sophisticated charging system, which is another economy. The high wing configuration also makes hand-launching easy. The entire set-up seems to work very well, giving flight times of around 9-10 minutes.

We all know that weight is our enemy with electrics, so building light is essential. Choose your wood with great care; a lot of balsa on sale is far too heavy for our requirements, just say no, and try elsewhere; it is in your interest to buy the best and lightest you can. I built the model as drawn with an all-up ready to fly weight of 48 oz. (3 Ibs.) using standard servos, rx, and a 600 mA receiver battery. The wing loading of around 17 oz/sq ft is very acceptable; the model flies extremely well, has a good climb out, and is quite stable during landing and flare out. The absence of rudder control imposes some restrictions on maneuvers, but not enough to spoil the fun.

If you are interested in building this unusual model, I will give you a few tips on how to proceed, it will not be a 'stick A to B' type of thing, just general information on the methods so that the whole thing comes together in the right order..."

Supplementary file notes

Article pages, text and pics, thanks to hlsat.

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