Baby Bipe (oz14027)

About this Plan

Baby Bipe. Radio control sport aerobatic biplane model for 1 - 2 cc engine. Wingspan 770 mm.

Direct submission to Outerzone. Originally sourced from the Edimodel plan pages, see datafile.

Update 6/12/2023: Added article, thanks to Cesare.

Quote (google-translated from the Italian): "Obviously the whole argument stands if the model is designed in a targeted way. To do this I started by choosing the engine which I had set myself should be no more than 1 cc and, subsequently, I calculated the dimensions and weights. Among the engines I had considered there was also an engine recently available on the market, the 1 cc MP JET, and by evaluating its characteristics I was convinced that it could be the right choice.

In fact, this micromotor has everything you could expect for practical and easy use: it is light (it weighs only 100 grams complete with muffler), it is equipped with 2 bearings on the shaft, it has an RC carburettor complete with idle adjustment. It comes complete with a muffler, pulls a 7x3.5 propeller at more than 14,000 rpm and, last but not least, costs just over 100,000 lire. I really don't think we can ask for more and therefore all that remained was ordinary for the A.R.C. to move from theory to practice. Having it in my hands, I carried out some tests on the bench and was thus able to verify its ease of starting, the easy adjustment of both the maximum and minimum and the very limited noise level.

The only modification that I thought of making after the first flights was the addition of a tube to the muffler to obtain a pressure point to connect to the tank which, although not essential, regulates the engine during wheelies. It can truly be said that it is a beautiful little gem and that it does not betray the Czechoslovakian tradition in the field of precision mechanics.

Based on the performance measured on the bench I went to the drawing board and what came out of it is what I am proposing to you with the name of 'Baby Bipe' and whose essential characteristics are the following:

As you can see, it is a biplane and this configuration was chosen, even if it involves a little more work, because it allows greater compactness, better response to commands and gives that extra charm of the classic aerobatic biplane.

The structure is completely conventional and therefore the construction is quite simple; you just need to pay attention when choosing the balsa boards so that they are of the required consistency and naturally nice and straight.

Construction of the wings: It is best to start construction with the wings because then it will be easier to prepare the pylon that supports the upper wing. The wings, which are almost identical, except for the dihedral and the span, do not present any particular difficulty.

The only recommendation I make to the less experienced is to glue the ribs to the spar initially only in the lower part because otherwise, if the joints are not more than precise, the glue pulls and tends in the upper part to close and then 'board' the wing upwards; it is therefore necessary to first complete the 'D-box' with the upper covering and then re-glue all the glues. I am convinced that this small precaution is amply compensated by the extreme simplicity of the structure..."

Supplementary file notes

Article.

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